Annual catch quotas and other regulations of the Barents Sea fisheries are set through negotiations between Norway and Russia. Assessment of the state of the stocks and quota advice are given by the International Council for the Exploration of the Sea (ICES). Their work is based on survey results and international landings statistics. The results from the demersal fish winter surveys in the Barents Sea are an important source of information for the annual stock assessment.
The development of the survey started in the early 1970s and focused on acoustic measurements of cod and haddock. Since 1981 it has been designed to produce both acoustic and swept area estimates of fish abundance. Some development has taken place since then, both in area coverage and in methodology. The development is described in detail by Jakobsen et al . (1997), Johannesen et al . (2009) and in Appendix 3, and the current survey design and methods for survey index calculation are presented in Appendix 2. The survey manual is available at the internal IMR quality portal here. At present the survey provides the main data input for several ongoing projects at the Institute of Marine Research, Bergen:
monitoring abundance of the Barents Sea demersal fish stocks
mapping fish distribution in relation to climate and prey abundance
monitoring food consumption and growth
estimating predation mortality caused by cod
This report presents the main results from the surveys in January-March 2023. The surveys were performed with the Norwegian research vessels “Kronprins Haakon” and “Johan Hjort”, and the Russian research vessel “Vilnyus”. Annual survey reports since 1981 are listed in Appendix 5, and names of scientific participants in 2023 are given in Appendix 4.
1. Survey operation
Table 1.1 presents the vessels participating in the survey in 2023 and IMR trawl station series numbers, and Figure 1.1 shows survey tracks, trawl stations and ice cover.
Period
Series no.
Johan Hjort
26.01-17.03
70001-70263
Kronprins Haakon
05.02-20.02
70301-70385
Vilnyus
28.01-20.02
70501-70626
Table 1. 1. Vessel participation by period and trawl station series numbers by vessel for the winter survey in 2023.
Table 1.2. Number of trawl stations by main area in the Barents Sea winter 2023. B1= swept area bottom trawl (quality=1 and condition<3), B2 =other bottom trawl, P=pelagic trawl, N=trawl stations in new strata. Refer to Figure 1.1. or Appendix 1 for a map of the main areas.
The coverage of the most northern and most eastern strata differs from year to year. The areas of these strata are therefore calculated according to the coverage each year. Table A1.1 gives the area covered by the survey every year since 1981. In that table “Extrapolated area” reflects the size of areas where some kind of extrapolations/adjustments have been made to take account of incomplete coverage (see also section 3.1). Table 1.3 summarizes the degree of coverage and main reasons for incomplete coverage in the whole period.
Year
Coverage
Comments
1981-1992
ABCD
1993-1996
ABCDD’ES
1997
Norwegian EEZ (NEZ), S
Not allowed access to Russian EEZ
1998
NEZ, S, minor part of Russian EEZ
Not allowed access to most of Russian EEZ
1999
ABCDD’ES
Partly limited coverage due to westerly ice extension
2000
ABCDD’ES
Russian participation starts
2001-2005
ABCDD’ES
Russian vessel covered where Norwegians had no access
2006
ABCDD’ES
No Russian vessel, not allowed access to Murman coast
2007
NEZ, S
No Russian vessel, not allowed access to Russian EEZ
2008
ABCDD’ES
Russian vessel covered where Norwegians had no access
2009
ABCDD’ES
Reduced Norwegian coverage of Russian EEZ due to catch handling
2010
ABCDD’ES
Reduced Norwegian coverage of Russian EEZ due to bad weather
2011
ABCDD’ES
Russian vessel covered where Norwegians had no access
2012
ABCDD’ES
No Norwegian coverage of Russian EEZ due to vessel problems
2013
ABCDD’ES
No Norwegian coverage of Russian EEZ due to vessel shortage
2014
ABCDD’ESN
Strata 24-26 (N) covered for the first time
2015
ABCDD’ESN
Slightly reduced/more open coverage due to bad weather
2016
ABCDD’ESN
No access to Russian EEZ, Russian vessel covered most of Russian EEZ
2017
ABCDD’ESN
No Russian vessel, not allowed access to southwestern Russian EEZ
2018
ABCDD’ESN
Russian vessel covered where Norwegians had no access
2019
ABCDD’ESN
Russian vessel covered where Norwegians had no access
2020
ABCDD’ESN
Reduced coverage of D’, E, and N due to bad weather, reduced survey time (medical emergency), and ice-cover
2021
ABCDD’ESN
Reduced coverage of D’ and E due to ice cover and time constraints, and of area N due to ice cover.
2022
ABCDD’ESN
Reduced coverage of D’ and E due to ice cover and time constraints, and of area N due to ice cover.
2023
ABCDD’ESN
Reduced coverage of D’, E, and N due to ice cover and time constraints.
Table 1.3. Barents Sea winter surveys 1981-2023. Main Areas covered, and comments on incomplete coverage.
2. Length and age material
Individual lengths are collected from all target species, while otoliths for age determination are taken from cod, haddock, and capelin. For cod and haddock, the otolith readings are key for splitting the survey indices by age.
Table A2.1 gives an account of the sampled length- and age material from bottom hauls and pelagic hauls from 1994 onwards.
Table A2.2. shows the number of age readings per age for cod from 1994 onwards, while table A2.3 shows the same for haddock. The number of age samples for fish age 10+ increased in the second half of the time series, reflecting changing age composition in the stocks.
3. Survey index calculation
Details on the calculation of survey indices, including StoX settings for different species are found in Appendix 2.
In 2023, the swept area and acoustic1 estimation in StoX was based on the following biotic and acoustic snapshot files (versioned trawl and acoustic data):
Table 3.1 : Snapshot files used in the 2023 swept area and acoustic estimation, by species.
1 Acoustic estimation is done for cod and haddock only. The biotic files are used in the acoustic StoX projects to split the acoustic backscatter by age.
3.1 Raising of indices
In 1997, 1998 and 2007, only the Norwegian EEZ (NEZ) and parts of the Svalbard area (S) was covered. The swept-area indices for cod, haddock, and Greenland halibut have therefore been raised to also represent the Russian EEZ (REZ) (Mehl et al . 2016).
In 2006, there was not complete coverage in the southeast due to restrictions. The observations in the partially covered strata 7 were extrapolated to the full strata, and the observations in the partially covered strata 13 were extrapolated to the same area as covered in 2005.
In 2012 the coverage was incomplete in the eastern areas, and the cod and haddock swept area estimates within the covered area were raised by the “index ratio by age” observed for the same area in 2008-2011 (ICES 2012). The scaling factor (“index ratio”) for estimating adjusted total from <Total – area D’> was the average ratio by age for Total/(Total – area D’) in the years 2008-2011 (Aglen et al. 2012).
In 2017, the Norwegian vessel was not allowed to operate south of 70º 10’ N and west of 41º 00 º E, and no Russian vessel participated in the survey. Only a small part of strata 7 was covered, and strata 13, 15, 17 and 20 were not covered. The cod, haddock, and Greenland halibut swept area estimates and cod and haddock acoustic estimates within the covered area were raised following the same procedure as for 2012. The scaling factor for estimating adjusted total from <Total – strata 7 > was the average ratio by age for Total/(Total – (strata 7+13+15+17+20)) swept area indices in the years 2014-2016.
In 2020, coverage was incomplete in strata 17, 19, and 20, and the cod and haddock acoustic and swept area estimates were raised by the “index ratio by age” observed for these strata in 2018-2019. The scaling factor for estimating adjusted total from <Total –strata 17, 19 and 20> was the average ratio by age for Total/(Total – (strata 17+19+20)) in the years 2018-2019.
In 2021, coverage was incomplete in strata 16, 19, and 20. Indices in the partly covered stratum 19 were extrapolated to the entire strata. No trawling was done in stratum 20. As cod and haddock abundances generally are low there, the stratum was partly ice covered and did not have coverage in the last two years, this stratum was excluded from estimation. Only one trawl station was taken in stratum 16. Here the cod and haddock acoustic and swept area estimates were raised by the “index ratio by age” observed for these strata in 2019-2020. The scaling factor for estimating adjusted total from <Total – strata 16> was the average ratio by age for Total/(Total – strata 16) in the years 2019-2020.
The three redfish survey indices were revised in 2022, and no adjustments have been made to the new indices.
In 2023, coverage was incomplete in strata 16, 17, and 20. Coverage was also reduced in strata 9, 13-15, and 24-26, but taken as representative. The main parts of the cod and haddock distributions were, nevertheless, well covered. Given historically low abundances of cod and haddock in stratum 20, this stratum was excluded from the estimation as in previous years. Stratum 16 had only two trawl stations, but given low abundances this year and, historically, they were taken as representative and included in the estimation procedure. Only the southeastern part of stratum 17 was covered. This area has a low abundance of haddock. Therefore, no adjustment was necessary in the haddock indices. For cod, the area of stratum 17 was adjusted to match the 300 m isobath in order to avoid inflating catches in the southwest, which have historically been higher than in the rest of the stratum.
4. Total echo abundance of cod and haddock
Table 4.1 presents the time series of total echo abundance (mean sA multiplied by strata area and summed over all strata) of cod and haddock in the investigated areas.
The lowest echo abundances of cod were recorded in the late 1990s, 2004-2007, and in the last few years of the time series (2021-2023), while the highest values were seen in 1994 and 2013-2015. The very low value in 2007 likely reflects the lack of coverage of the Russian zone and is not directly comparable to the others, making 2023 the lowest observed echo abundance in the time series, reflecting the current downwards trend in the stock.
The trend for haddock is similar, but without the dip in 2004-2007 and with peak values five years earlier than cod (2008-2010). The sharp reduction in echo abundance between 2020 and 2021 were seen for both species, but while cod echo abundance dropped from 2022 to 2023, haddock echo abundance remained at similar levels.
StoX
Year
Cod
Haddock
Sum
1994
5282
3898
9180
1995
3671
2948
6619
1996
2789
1248
4037
19971
1355
832
2187
19981
2254
543
2797
1999
1517
771
2288
2000
2833
1534
4367
2001
2158
1488
3646
2002
1976
2247
4223
2003
3717
3570
7287
2004
1174
2087
3261
2005
1370
2519
3889
2006
1116
2541
3657
20071
675
2311
2986
2008
3510
6195
9705
2009
2452
5300
7752
2010
3526
5939
9465
2011
2967
3715
6682
2012
3478
4182
7660
2013
5026
3604
9656
2014
4847
2915
7762
2015
5245
2161
7406
2016
2879
1587
4466
20171
2139
2588
4732
2018
3537
2851
6388
2019
3282
3039
6321
20201
2676
2199
4875
20211
1128
983
2111
2022
1437
1624
3061
2023
948
1635
2583
Table 4.1. Cod and haddock. Total echo abundance in the Barents Sea winter 1994-2023 (m2 reflecting surface · 103) estimated by StoX. Observations outside main areas A-S are not included.
1 not scaled for uncovered areas
5. Distribution and abundance of cod
For both the bottom trawl and acoustic estimates as well as the diet data, cod with all otolith types (coastal cod included) are included in the calculations.
5.1 Acoustic estimation
Surveys in the Barents Sea at this time of the year mainly cover the immature part of the cod stock. Most of the mature cod (age 7 and older) have started on their spawning migration southwards out of the investigated area and are therefore to a lesser extent covered. There are indications that a higher proportion than normal spawned along Finnmark in some years, e.g., 2004-2006. Thereby, a higher proportion of spawners might have been covered by the survey in those years. Figure 5.1 shows the spatial distribution of acoustic registrations assigned to cod in 2023. The registrations reflect the general distribution of cod in the central and southwestern Barents Sea. The NASC values in 2023 were low, reflecting the overall low echo abundance.
Figure 5.1. COD NASC. Distribution of acoustic backscatter (m2/nmi2 ) assigned to cod in 2023. The black lines without yellow circles represent parts of the cruise track where the acoustic backscatter was scrutinized, but not assigned to cod. NASC values < 5 was set to zero for this illustration.
Table A5.1 shows the acoustic indices for each age group by main areas in 2023. 73% of the 1-year olds were found in the extended area (N) in 2023 compared to 26 % in 2022. Age 1 also had the highest percentage in area N of all age groups. The time series of total abundance at age (1994-2023) is presented in Table A5.2 and Figure 5.2.
Figure 5.2. Time series of total acoustic abundance at age for cod (1994-2023). The dotted line separates the periods before and after the survey area was extended to include also area N.
The acoustic estimates have been variable and increasing in later years, with a peak in biomass in 2013, and this may partly be explained by variable and not complete coverage of the distribution area towards north and east in several years. As cod grow older it gets a more south-westerly distribution during winter, so that it “grows into” the covered area with increasing age. This is especially evident for the strong 2004 and 2005 year classes, which as 6-11-year-olds stand out as the strongest in the time series. The 2019-2020 year classes were among the lowest in the time series at age 1-3 while the 2021 and 2022 year classes were moderate at age 1/2. Table A5.3 shows time series for strata 24-26 (area N) in 2014-2023, which are included in the main time series.
Table A5.4 presents estimated coefficients of variation (CV) for cod age groups 1-14 in 1994-2023. These estimates were obtained by using StoX with a stratified bootstrap routine treating each transect as the primary sampling unit. In addition, a bootstrap routine for all trawl stations by strata was carried out within each run. The estimated CV (Standard Deviation ∙ 100/mean) is estimated from 500 iterations . A CV of 20% or less could be viewed as acceptable in a traditional stock assessment approach if the indices are unbiased (conditional on a catchability model). In 2023 the age groups 2-9 fall into this category. Values above this indicate higher uncertainty of the estimated index, with reduced information regarding year class strength. In all years, CVs for age groups older than 10 years are above what could be considered as acceptable. This is to a large degree related to low catch rates resulting in fewer age samples for these age groups (Table A2.2).
5.2. Swept area estimation
Figures 5.3 - 5.6 show the geographic distribution of bottom trawl catch rates (number of fish per NM2 ), for cod size groups < 20 cm, 20-34 cm, 35-49 cm and ≥ 50 cm. Usually, a high proportion of the smallest cod (less than 35 cm) are found in the eastern part of the survey area within the Russian EEZ and in the northern part of the strata system. While this general pattern was still there in 2023, cod abundance in the southeastern Barents Sea was low for all size groups (Fig. 5.3-5.6). The highest catch rates of large cod (≥ 50 cm) were found along the Norwegian coast, around Bear Island and to the west of Svalbard (Fig. 5.6).
Figure 5.3. COD < 20 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 5.4. COD 20-34 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 5.5. COD 35-49 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 5.6. COD ≥ 50 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Table A5.2 presents abundance indices by main areas and age, and the full time series 1994-2023 is shown in Table A5.5 and Figure 5.7. The bottom trawl indices have fluctuated somewhat for the same reasons as the acoustic indices, and the 2004 and 2005 year-classes stand out as the strongest in the time series. The 2009, 2011 and 2014 year-classes seemed to be strong as 1-year olds, but have later been reduced to average level or below. The year classes 2017 and 2018 also seemed strong at age one, but are more average as 2- and 3-year-olds. The 2019-2020 year classes were among the lowest in the time series both at age 1 and 2 while the 2021 and 2022 year classes were moderate at age 1. 70% of the 1-year olds were found in the extended area (N) in 2023 compared to 24 % in 2022. Age 1 also had the highest percentage in area N of all age groups (Table A5.6). This year, there was hardly any coverage northeast of the extended area, i.e., north of Svalbard outside of the survey stratification, where fair amounts of cod have been observed in previous years.
Figure 5.7. Time series of total bottom trawl abundance at age for cod (1994-2023). The dotted line separates the periods before and after the survey area was extended to include also area N.
Table A5.7 presents estimated coefficients of variation (CV) for cod age groups 1-15 in 1994-2023. In 2023, age groups 2-10 have CVs below or equal to 20 %. Values above this indicate higher uncertainty of the estimated index, with reduced information regarding year class strength. In all years, CVs for age groups older than 10 years are above what could be considered as acceptable. This is to a large degree related to low catch rates resulting in fewer age samples for these age groups (Table A2.2).
5.3 Survey mortalities
Table A5.9 and Figure 5.8a-b show the time series of survey-based mortalities (natural log ratios between survey indices of the same year class in two successive years) for the acoustic and swept area indices since 1994. These mortalities are influenced by natural and fishing mortality, age reading errors, and the catchability and availability (coverage) at age for the survey. In the period 1994-1999 there was an increasing trend in the survey mortalities. Most later surveys show lower mortalities, but there are some fluctuations for the same reasons as mentioned for the acoustic and swept area indices. Presumably the mortality of the youngest age groups (ages 1-3) is mainly caused by predation, while for the older age groups the fishery is the main cause. Although the survey mortalities are noisy, the mortalities for age 4 and older correspond well with the strong decrease in fishing mortality around 2007 in the stock assessment. The low survey mortalities in the 2010s, even with “impossible” negative values, could partly be caused by fish gradually “growing into” the covered area at increasing age. 2019-2020 and 2020-2021 estimates suggest higher survey mortalities than in previous years, while mortality decreased for most age groups in 2021-2022 and increased again in 2022-2023.
Figure 5.8a. Survey mortalities for cod calculated from acoustic abundance indices.
Figure 5.8b. Survey mortalities for cod calculated from bottom trawl abundance indices.
5.4 Growth and maturity
Tables A5.10-11 and figure 5.9-5.10 present the time series for mean length and mean weight at age. There have previously only been moderate fluctuations, but with a decreasing trend for older fish (8+) in later years. However, in 2020-2021, both length and weight at age was considerably reduced for several age groups, with length at age 4 and 5 and weight at age 4, 5, 6 and 8 in 2021 being the lowest observed in the time series. Growth improved somewhat in 2022 and 2023 (Table A5.12 and Fig 5.11). In 2023, length and weight at age was above the long-term average for ages 1-4, but below for ages 5-8.
Figure 5.9. Mean length at age for cod.
Figure 5.10. Mean weight at age for cod.
Figure 5.11. Mean growth increment at age for cod for the period 2014-2023.
The proportion mature at age is presented in Table A5.13 and Fig 5.12. The proportion increased from 2022 to 2023 and was in 2023 above the long-term average for ages 7-9, but below for age 6 and 10. Since 2010, the proportion mature at ages 6-8 has declined, but has in recent years stabilized.
Figure 5.12. Proportion mature-at-age for cod from 2014-2023.
The degree of coverage of the Russian zone (REZ) may also influence the biological parameters, as body size tends to decrease towards the northeast in the survey area. In addition, length, weight and maturity at age of older ages has higher uncertainty due to fewer samples (c.f. table A2.2).
5.5 Stomach sampling
Since 1984, cod stomachs have been sampled regularly during the winter survey. The sampling strategy has generally been the same as that for sampling otoliths. Stomach have been frozen on board and analysed in the laboratory, except for the period 1994-2000, when some of the stomachs were analysed on board and only the main prey categories were identified. For details about the sampling methodology and the Norwegian-Russian cooperation on diet investigations in the Barents Sea, see Mehl and Yaragina (1992) and Dolgov et al . (2007).
The number of stations and stomachs sampled as well as the proportion of empty stomachs and the mean stomach fullness index (SFI, see below) for each of four size groups (≤ 19 cm, 20-34 cm, 35-49 cm, ≥ 50 cm) is given in Table A5.14 and Fig. 5.13. Tables A5.15 - A5.18 and Figs. 5.14-5.17 show the mean stomach content composition by prey species/groups by year for each size group. Note that in the years 1994-2000, blue whiting, long rough dab and Norway pout were included in the category ‘other fish’ when stomachs were analysed on board.
Figure 5.13. Mean stomach fullness for cod.
Figure 5.14. Stomach content composition for cod <20 cm.
Figure 5.15. Stomach content composition for cod 20-34 cm.
Figure 5.16. Stomach content composition for cod 35-49 cm.
Figure 5.17. Stomach content composition for cod >=50 cm.
The stomach fullness index is calculated as SFIi=100*ΣWSi/Wi, where WSi is the weight (g) of the stomach of fish i, and Wi is the weight (g) of fish i . For 1987 SFI has not been calculated, because very few fish were weighed that year due to technical problems. The distribution on prey groups has been adjusted by distributing the unidentified component of the diet proportionally among the various components, taking into account the level of identification.
The proportion of empty stomachs is largest for the smallest fish (Table A5.14), a pattern seen for all years. The stomach fullness in 2022 was higher than in 2021 for all length groups except cod ≥ 50 cm. Capelin is the dominating prey for cod ≥ 20 cm, followed by shrimp (Tables A5.16-A5.18), while krill dominates for the smallest cod (Table A5.15). However, in many years capelin is also an important prey for the smallest cod. The proportion of capelin in the diet increased from 2021 to 2022 for all cod size groups.
6. Distribution and abundance of haddock
6.1 Acoustic estimation
The survey covers best the immature part of the haddock stock. At this time of the year an unknown proportion of the mature haddock (age 6 and older) is on its spawning migration south-westwards out of the investigated area. In some earlier years, e.g., 2004 and 2005, concentrations of mature haddock have been observed pelagically rather far above bottom along the shelf edge. The bottom trawl sampling poorly covers these concentrations. There are indications that the distribution of age groups 1 and 2 in some years are concentrated in coastal areas not well covered by the survey. This occurred in the late 1990s and will have strongest effect on estimates of abundance of the poor year-classes. In the later surveys, small haddock have been widely distributed, and the strong year-classes have been found unusually far to the north. Favourably hydrographic conditions and/or density dependent mechanisms might cause this. However, it is difficult to separate the two factors.
Figure 6.1 shows the spatial distribution of acoustic registrations assigned to haddock in 2023. The registrations reflect the general distribution of haddock in the southern and eastern Barents Sea. The overall echo abundance in 2023 was higher than the very low registrations in 2021, but lower than in 2022.
Figure 6.1. HADDOCK NASC. Distribution of acoustic backscatter (m2/nmi2 ) assigned to haddock in 2023. The black lines without yellow circles represent parts of the cruise track where the acoustic backscatter was scrutinized, but not assigned to haddock. NASC values < 5 was set to zero for this illustration.
The acoustic abundance indices by age and the main areas in 2023 are presented in Table A 6.1. As in most of the previous years the highest abundance was observed in main area D. The full time series is presented in Table A 6.2 and Figure 6.2. Abundance of age 2 in 2023 increased compared to 2021 and 2022 when it was very low. This is reflected in low abundances of ages 3 and 4 in 2023. Abundance of age 7 (year-class 2016) in 2023 was quite high, while abundance of older fish (age 8+) was low.
Figure 6.2. HADDOCK abundance (acoustic indices) 1994-2023. The different colours represent the ages from 1 to 8+. The dashed vertical line indicates 2014 when the survey area was extended to include main area N.
The strong 2004-2006 year-classes can be followed through the time series. In later years, the 2009-, 2011-, and 2013-2018-year classes, seem to be fairly strong. In particular, the year classes 2016 and 2017 have high indices at age 1-2. The year class 2019 appears to be much weaker as the abundance of 1-year-olds observed in 2020 is the third lowest in the time series, and the weakest in the time series at ages 2, 3, and 4 year. Abundance of the 2020 year-class, while still low, is still almost 7 times higher than the 2019 year-class as 3 year olds. The 2021 year-class is much stronger and above average in the time series. The 2022 year-class appears a little bit weaker than average.
Table A 6.3 shows indices for strata 24-26 (main area N), which are also included in the full time series (Table A 6.2). The contribution from main area N was rather low in all years, except in 2018 when 29% of age 1 haddock (by number) was found in the extended area, constituting 13% of the biomass. The total abundance in area N in 2023 is 7% by number and 2% by biomass.
Table A 6.4 presents estimated coefficients of variation (CV) for haddock age groups 1-14. In most years, CVs for age groups older than 7 years are above what could be considered as acceptable (approximately 20 %).
6.2. Swept area estimation
Figures 6.3 - 6.6 show the geographic distribution of bottom trawl catch rates (number of fish per NM 2 ) for haddock size groups < 20 cm, 20-34 cm, 35-49 cm and ≥ 50 cm. Like in previous years, the distribution extends further to the north and to the east than what was usual in the 1990s.
Table A 6.5 presents the indices for each age group by main areas. Compared to cod a lower proportion of haddock is found in the extended survey area (Table A 6.5). In 2023, the extended area contributed about 6 % of total abundance and about 2 % of total biomass.
Figure 6.3. HADDOCK < 20 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 6.4. HADDOCK 20-34 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 6.5. HADDOCK 35-49 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 6.6. HADDOCK ≥ 50 cm. Distribution in valid bottom trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
The full time series is shown in Table A 6.6 and Figure 6.7. The swept area estimates, too, are highest in the east in area D. The weak 2019 year-class noted for the acoustic index is evident also in the swept area estimates. Overall, this survey tracks both strong and poor year-classes fairly well.
Figure 6.7. HADDOCK abundance (swept area indices) 1994-2023. The different colours represent the ages 1-9+. The dashed vertical line indicates 2014 when the survey area was extended to include main area N.
Table A 6.8 presents estimated coefficients of variation (CV) for haddock age groups 1-14. In most years, CVs for age groups older than 7 years are above what could be considered as acceptable (approximately 20 %) .
6.3 Survey mortalities
Survey mortalities based on the acoustic and swept area indices (Table A 6.9, Figure 6.8) have varied between years, and for most age groups there are no obvious trends. However, there are signs of co-variability within years.
Tables A 6.10 and Figure 6.9 present the time series for mean length. Table A 6.11 Figure 6.10 present mean weight at age. Length and weight estimates have been variable with no specific trends in the latest years.
Figure 6.9. HADDOCK, mean length (cm) by age 1994-2023. Yellow diamonds indicate ages with < 5 individuals sampled.
Figure 6.10. HADDOCK, mean weight (kg) by age 1994-2023. Yellow diamonds indicate ages with < 5 individuals sampled.
Annual weight increments are shown in Table A 6.12, and Figure 6.11, these are highly variable and show no trends.
Figure 6.11. HADDOCK, annual weight increments.
The proportion mature at age also shows large variations between years (Table A 6.13, Figure 6.12).
Figure 6.12. HADDOCK, proportion mature at age. Yellow diamonds indicate ages with < 5 individuals sampled.
The large variation is one of the reasons that length, weight and maturity at age are modelled from the empirical data in the haddock stock assessment to account for inconsistencies due to high sampling variance and to fill in missing age-year combinations. The assessment input data for these variables may therefore differ from what presented here. The degree of coverage of the Russian Exclusive economic zone (EEZ) may influence the biological parameters, as body size tends to decrease towards the northeast in the survey area. In addition, length, weight and maturity at age of older ages has higher uncertainty due to fewer samples.
7. Distribution and abundance of redfish
Earlier reports from this survey have presented distribution maps and abundance indices based on acoustic observations of redfish. In later years, blue whiting has dominated the acoustic records in some of the main redfish areas. Due to incomplete pelagic trawl sampling the splitting of acoustic records between blue whiting and redfish has been very uncertain. The uncertainty relates mainly to the redfish, since it only makes up a minor proportion of the total value. This has been the case since the 2003 survey, and the acoustic results for redfish are therefore not included in the reports.
7.1 Golden redfish (Sebastes norvegicus)
Figure 7.1 shows the geographical distribution of golden redfish based on the catch rates in bottom trawl. In most years, the distribution is completely covered except towards the northwest. Figure 7.2 and Table A7.1 presents the time series (1994-2023) of swept area indices by 5 cm length groups for the standard area (strata 1-23). The indices were low in many years since 1999 for all length groups. However, in 2016 and 2017 there was an increase in the indices of fish above 25 cm, and in 2018 the total index was at the same level as in 2017, while the total biomass was slightly lower. In 2019 the indices for fish between 35 and 50 cm increased further, and the total abundance and biomass were the highest since 1998. The index for most length groups declined in 2020 and further in 2021 when the abundance of fish < 20 cm was particularly low. However, the 2021 year class appears to have been strong as the number of <10 cm fish was the highest in the series, and the total abundance was the highest since 1998. Table A7.2 present swept area abundance indices by length groups for area N in 2014-2023. Golden redfish was found in this extended survey area in 2014-2023, mainly west of Spitsbergen (strata 24). 17% of the total abundance and 5 % of total biomass was found in the extended area in 2023. Table A7.3 presents estimates of coefficients of variation (%) by length groups. In all years, CVs for most length groups are above what could be considered as acceptable in stock assessment (approximately 20 %).
Figure 7.1. GOLDEN REDFISH (Sebastes norvegicus). Distribution in the trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 7.2. GOLDEN REDFISH (Sebastes norvegicus). Abundance indices (numbers in thousands) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
7.2 Beaked redfish (Sebastes mentella)
Figure 7.3 shows the geographical distribution of beaked redfish based on the catch rates in bottom trawl. Figure 7.4 and Table A7.4 presents the time series (1994-2023) of swept area abundance indices by 5 cm length group for beaked redfish in the standard area (strata 1-23), while Table A7.5 present indices for new strata 24-26 in 2014-2023.
In 2015 and 2016, the estimated indices for 20-39 cm beaked redfish were among the highest in the time series, and in 2017 the indices for 30-39 cm beaked redfish were the highest in the time series, as were the total index and total biomass. The indices for most length groups decreased somewhat from 2017 to 2018 and remained at about the same level in 2019 and 2020 before increasing in 2021. However, the 2020, year class, appears to have been strong as the 2021 estimate of fish < 10 cm and 2022-2023 estimate of 10-15 cm fish were the highest in the time series. The coverage of the beaked redfish distribution was not complete west and north of Spitsbergen (Fig. 7.3). The extended survey area in 2023 contributed about 10% of the total abundance index, compared to around 3 % in 2019 and 2020 and 10 and 9% in 2021 and 2022.
Table A7.6 presents estimates of coefficients of variation (%) by length groups. In most years, CVs for length groups between 10 and 29 cm are at a level that could be considered as acceptable for stock assessment, and in most recent years up to 44 cm.
Figure 7.3. BEAKED REDFISH (Sebastes mentella). Distribution in the trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 7.4. BEAKED REDFISH (Sebastes mentella). Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
7.3 Norway redfish (Sebastes viviparus)
Figure 7.5 shows the geographical distribution of Norway redfish. Figure 7.6 and Table A7.7 presents the time series (1994-2023) of swept area indices by 5 cm length groups in the standard area (strata 1-23). Almost all Norway redfish are found in areas ABCD, mainly in main area B, and almost nothing in the extended survey area (Table A7.8). In 2021, the smallest fish (< 10 cm) were found in the extended survey area for the first time and then again in 2022 as the < 15 cm fish. In 2023, fish between 10 and 25 cm were found in the extended survey area.
A few large catches often drive the indices for Norway redfish. There was a large and unexplained increase in the indices of most length groups from 2013 to 2015 to among the highest levels in the time series. Apart from a dip in 2016, the total abundance has remained relatively high since then. The total abundance increased with nearly 50 % in 2021 to the highest observed since 1994, driven by high abundance of 15-30 cm fish. In 2022 and 2023, the abundance of <10 cm increased significantly.
Table A7.9 presents estimates of coefficients of variation (%) by length groups. In most years, CVs for most length groups are far above what could be considered as acceptable for stock assessment.
Figure 7.5. NORWAY REDFISH ( Sebastes viviparus) . Distribution in the trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey .
Figure 7.6. NORWAY REDFISH (Sebastes viviparus). Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
8. Distribution and abundance of Greenland halibut
Figure 8.1 shows the distribution of bottom trawl catch rates of Greenland halibut. The most important distribution areas for the adult fish (depths between 500 and 1000 m along the western slope), are not covered by this survey. The observed distribution pattern in 2023 was similar to those observed in previous years’ surveys. However, areas north of Svalbard was not covered.
Figure 8.1. GREENLAND HALIBUT. Distribution in the trawl catches winter 2023 (number per nm2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
The time series (1994-2023) of swept area abundance indices by 5 cm length groups in the standard area is presented in Table A8.1 and Figure 8.2. The abundance indices were low in the 90’s, but increased considerably in 2005 and have remained at a higher level than in the 90’s, with a peak in 2015. After decreasing indices from 2016-2018, there has been an increase in abundance indices since 2019. The abundance in 2023 is at an all-time high, mainly due to an increase in abundance of length groups 30-34 and 35-39 cm.
Figure 8.2 GREENLAND HALIBUT. Abundance indices (numbers in thousands) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
Swept area abundance indices by length groups for new strata 24-26 in 2014-2023 are found in table A8.2. The abundance index for 2021 and 2022 were higher than in all previous years for individuals smaller than 35 cm, which is related to the coverage of areas close to/inside the ice that has not previously been covered in the survey. The indices for 2023 is among the lowest in the time series.
Table A8.3 presents estimates of coefficients of variation (%) for length groups. In most years, only CVs for length groups between 40 and 59 cm are at a level that could be considered as acceptable for stock assessment.
9. Distribution and abundance of capelin, polar cod and blue whiting
9.1 Capelin
Although capelin is primarily a pelagic species, small amounts of capelin are normally caught in the bottom trawl throughout most of the investigated area. In Figure 9.1 catch rates of capelin smaller and larger than 14 cm are shown for the winter survey in 2023. Capelin smaller than 14 cm during this period will mainly comprise the immature stock component, while the larger capelin constitutes the pre-spawning capelin stock. Some few trawl hauls show large capelin catches (numbers exceeding 100 000 individuals), and these can probably not be considered representative for the density in the area, because such hauls will either result from hitting a capelin school at the bottom or up in the water column. For this reason, we choose not to present swept area-based indices for capelin in this report.
At this time of the year, mature capelin has started their approach to the spawning areas along the coast of Troms, Finnmark and the Kola peninsula, while immature capelin will normally be found further north and east, in the wintering areas. This is reflected on the maps of capelin distribution, even though some large capelin is always found north of 75°N, and smaller capelin are found sporadically in near-coastal areas. The geographical coverage of the total capelin stock is incomplete, but the maturing component is probably best covered.
It has been noted during several surveys that when sampling capelin from demersal and pelagic trawls, the individuals from demersal trawls are normally larger (and older) than those sampled pelagically. This has led to formation of a hypothesis saying that larger individuals tend to stay deeper than smaller individuals and some even to take up a demersal life. This hypothesis has not been tested, and during the winter surveys there are probably too few pelagic hauls to study the vertical distribution of capelin in a systematic way.
9.2 Polar cod
Polar cod are not well represented in the trawl hauls conducted during the winter surveys (Figure 9.2). This is because this endemic arctic species has a more northern and eastern distribution area in the Barents Sea. During this time of the year, polar cod is known to be spawning under the ice-covered areas of the Pechora Sea and close to Novaya Zemlya. It is not clear whether the concentrations found in open water this time of the year are mature fish either on their way to spawning or from the spawning areas, or if this is immature fish. In 2023, catch rates of polar cod were high in the central Barents Sea close to/inside the ice possibly reflecting the increased abundance of this species in the last years.
Figure 9.1. CAPELIN. Distribution in the trawl catches winter 2023 ( number per nm 2 ) for capelin of immature sizes (beige circles, appearing green when placed on top of blue) and mature sizes (blue circles). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
Figure 9.2. POLAR COD. Distribution in the trawl catches winter 2023 ( number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey.
9.3 Blue whiting
Since the second part of the 1990s, blue whiting has shown a wider distribution than previously, and echo recordings have indicated higher abundance in the Barents Sea. Figure 9.3.1 shows the geographical distribution of the bottom trawl catch rates of blue whiting in 2023. Since the fish is mainly found pelagically, the bottom trawl does not reflect the real density distribution, but gives some indication of the distribution limits. Acoustic observations would better reflect the relative density distribution. The number of pelagic hauls has, however, been too low to properly separate the pelagic recordings. During the years with high abundance of blue whiting, dense concentrations of blue whiting might have masked recordings of pelagic redfish, haddock and small cod.
Figure 9.3.2 and Table A9.1 shows the bottom trawl swept area estimates by 5 cm length groups for the years 1994-2023. High abundance of fish below 20 cm in several years, e.g., 2001, 2004, 2012, 2015, and 2021 reflects abundant recruiting year-classes (age 1). The distribution of blue whiting in the Barents Sea reflects mostly abundance of younger age groups, i.e., when there are strong year-classes coming into the stock they are seen in the winter survey in the Barents Sea as 1-group the year after. The 2014 year-class is very strong, and this is reflected in the survey in 2015 as fish smaller than 20 cm. 2020 and 2021 year-classes are also regarded as strong.
Relatively high abundance of blue whiting was found in the extended survey area the last years, similar to the situation with abundant recruiting year-classes (Table A9.2). Table A9.3 presents estimates of coefficients of variation (%) by length groups. In most years, CVs for most length groups are above what could be considered as acceptable for stock assessment.
Figure 9.3.1. BLUE WHITING. Distribution in the trawl catches winter 2023 (number per nm 2 ). Black crosses indicate zero catches and the shaded area the ice coverage early in the survey .
Figure 9.3.2. BLUE WHITING. Time series of total bottom trawl abundance at age for blue whiting (1994-2023). The dotted line separates the periods before and after the survey area was extended to include also area N.
10. References
Aglen, A. and Nakken, O. 1997. Improving time series of abundance indices applying new knowledge. Fisheries Research, 30: 17-26.
Aglen, A., Dingsør, G., Mehl, S., Murashko, P. and Wenneck, T. de L. 2012. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 21 January – 15 March 2012. WD #3 ICES Arctic Fisheries Working Group, Copenhagen, Denmark 20-26 April 2012.
Aschan, M. and Sunnanå, K. 1997. Evaluation of the Norwegian shrimp surveys conducted in the Barents Sea and Svalbard area 1980-1997. ICES C M 1997/Y:07. 24pp.
Bogstad, B., Fotland, Å. and Mehl, S. 1999. A revision of the abundance indices for cod and haddock from the Norwegian winter survey in the Barents Sea, 1983-1999. Working Document, ICES Arctic Fisheries Working Group, 23 August - 1 September 1999.
Dalen, J. and Nakken, O. 1983. On the application of the echo integration method. ICES CM 1983/B: 19, 30 pp.
Dalen, J. and Smedstad, O. 1979. Acoustic method for estimating absolute abundance of young cod and haddock in the Barents Sea. ICES CM 1979/G:51, 24pp.
Dalen, J. and Smedstad, O. 1983. Abundance estimation of demersal fish in the Barents Sea by an extended acoustic method. In Nakken, O. and S.C. Venema (eds.), Symposium on fisheries acoustics. Selected papers of the ICES/FAO Symposium on fisheries acoustics. Bergen, Norway, 21-24 June 1982. FAO Fish Rep., (300): 232-239.
Dickson, W. 1993a. Estimation of the capture efficiency of trawl gear. I: Development of a theoretical model. Fisheries Research 16: 239-253.
Dickson, W. 1993b. Estimation of the capture efficiency of trawl gear. II: Testing a theoretical model. Fisheries Research 16: 255-272.
Dolgov, A. V., Yaragina, N.A., Orlova, E.L., Bogstad, B., Johannesen, E., and Mehl, S. 2007. 20 th anniversary of the PINRO-IMR cooperation in the investigations of feeding in the Barents Sea – results and perspectives. Pp. 44-78 in ‘Long-term bilateral Russian-Norwegian scientific cooperation as a basis for sustainable management of living marine resources in the Barents Sea.’ Proceedings of the 12th Norwegian- Russian symposium, Tromsø, 21-22 August 2007. IMR/PINRO report series 5/2007, 212 pp.
Engås, A. 1995. Trålmanual Campelen 1800. Versjon 1, 17. januar 1995, Havforskningsinstituttet, Bergen. 16 s. (upubl.).
Engås, A. and Godø, O.R. 1989. Escape of fish under the fishing line of a Norwegian sampling trawl and its influence on survey results. Journal du Conseil International pour l'Exploration de la Mer, 45: 269-276
Engås, A. and Ona, E. 1993. Experiences using the constraint technique on bottom trawl doors. ICES CM 1993/B:18, 10pp.
Fall, J. 2020. NEA cod and haddock indices from the Barents Sea winter survey 2020. Working Document # 10 Arctic Fisheries Working Group, ICES HQ (via webex), Copenhagen, Denmark, 16-22 April 2020
Foote, K.G. 1987. Fish target strengths for use in echo integrator surveys. Journal of the Acoustical Society of America, 82: 981-987.
Godø, O.R. and Sunnanå, K. 1992. Size selection during trawl sampling of cod and haddock and its effect on abundance indices at age. Fisheries Research, 13: 293-310.
ICES 2012. ICES. (Aglen, A., Bogstad, B., Dingsør, G.E., Gjøsæter, H., Hallfredsson, E.H., Mehl, S., Planque, B. et al.) 2012. Report of the Arctic Fisheries Working Group, ICES Headquarters, Copenhagen 20-26 April 2012. ICES CM 2012/ACOM: 05. 633 pp.
ICES. 2021. Benchmark Workshop for Barents Sea and Faroese Stocks (WKBARFAR). ICES Scientific Reports. 3:21. 2015 pp. https://doi.org/10.17895/ices.pub.7920
Jakobsen, T., Korsbrekke, K., Mehl, S. and Nakken, O. 1997. Norwegian combined acoustic and bottom trawl surveys for demersal fish in the Barents Sea during winter. ICES CM 1997/Y: 17, 26 pp.
Johannesen, E., Wenneck, T. de L., Høines, Å., Aglen, A., Mehl, S., Mjanger, H., Fotland, Å., Halland, T. I. and Jakobsen, T. 2009. Egner vintertoktet seg til overvåking av endringer i fiskesamfunnet i Barentshavet? En gjennomgang av metodikk og data fra 1981-2007. Fisken og Havet nr. 7/2009. 29s.
Johnsen, E., Totland, A., Skålevik, Å., Holmin, A. J., Dingsør, G. E., Fuglebakk, E., & Handegard, N. O. (2019). StoX: An open source software for marine survey analyses. Methods in Ecology and Evolution, 10(9), 1523-1528.
Jolly, G. M., & Hampton, I. (1990). A stratified random transect design for acoustic surveys of fish stocks. Canadian Journal of Fisheries and Aquatic Sciences, 47(7), 1282-1291.
Knudsen, H.P. 1990. The Bergen Echo Integrator: an introduction. - Journal du Conseil International pour l’Exploration de la Mer, 47: 167-174.
Korneliussen, R. J., Heggelund, Y., Macaulay, G. J., Patel, D., Johnsen, E., & Eliassen, I. K. (2016). Acoustic identification of marine species using a feature library. Methods in Oceanography, 17, 187-205.
Korsbrekke, K. 1996. Brukerveiledning for TOKT312 versjon 6.3. Intern program dokumentasjon., Havforskningsinstituttet, september 1996. 20s. (upubl.).
Korsbrekke, K., Mehl, S., Nakken, O. og Sunnanå, K. 1995. Bunnfiskundersøkelser i Barentshavet vinteren 1995. Fisken og Havet nr. 13 - 1995, Havforskningsinstituttet, 86 s.
Mehl, S., Aglen, A. and Johnsen, E. 2016. Re-estimation of swept area indices with CVs for main demersal fish species in the Barents Sea winter survey 1994-2016 applying the Sea2Data StoX software. Fisken og havet 10/2016. Institute of Marine Research, Bergen, Norway. 43 pp.
Mehl, S., Aglen, A., Johnsen, E. and Skålevik, Å. 2018. Estimation of acoustic indices with CVs for cod and haddock in the Barents Sea winter survey 1994 – 2017 applying the Sea2Data StoX software. Fisken og havet no. 5-2018. ISSN 0071-5638. Institute of Marine Research, Bergen, Norway. 29 pp.
Mehl, S. and Yaragina, N.A. 1992. Methods and results in the joint PINRO-IMR stomach sampling program. Pp. 5-16 in Bogstad, B. and Tjelmeland, S. (eds.): Interrelations between fish populations in the Barents Sea. Proceedings of the fifth PINRO-IMR Symposium, Murmansk, 12-16 August 1991. Institute of Marine Research, Bergen, Norway.
Mjanger, H., Svendsen, B.V., Fuglebakk, E., Skage, M.L., Diaz, J, Johansen, G.O., Vollen, T, Bruck, S. A., and Gundersen, S. 2021. Handbook for sampling fish, crustaceans and other invertebrates. Version 16.00. October 2021. Ref.id.: FOU.SPD.HB-05, Institute of Marine Research. 146 pp.
Totland, A. and Godø, OR. 2001. BEAM – an interactive GIS application for acoustic abundance estimation.
In T. Nishida, P.R. Kailola and C.E. Hollingworth (eds.): Proceedings of the First Symposium on Geographic Information System (GIS) in Fisheries Science. Fishery GIS Research Group. Saitama, Japan.
Appendix 1 . Data tables
Main Area
Extrapolatedarea
Year
A
B
C
D
D'
E
S
N
Total excluding N
1981-92
23299
8372
5348
51116
-
-
-
88135
1993
23929
8372
5348
51186
23152
8965
16690
137642
1994
27180
9854
5165
53394
36543
11417
17557
161110
1995
26797
9854
5165
53394
58605
13304
24783
191904
1996
26182
9854
5165
53394
54047
5738
11809
166190
19971
27785
9854
5165
23964
2670
0
18932
88371
56200
19981
27785
9854
5165
23964
5911
3829
23931
100440
51100
1999
27785
9854
5165
43230
8031
5742
18737
118545
2000
27173
9854
5165
52314
29438
14207
25053
163204
2001
26609
9854
5165
53394
29694
15777
24157
164652
2002
26594
9854
5165
53394
21914
15757
24689
157369
2003
26621
9897
5165
52072
23947
6259
23400
147361
2004
27785
9854
5165
53394
42731
4739
20760
164428
2005
27785
9854
5165
53394
39104
19931
24648
179883
20062
27785
9854
5165
53394
35302
13872
24691
170064
18100
20071
27785
9854
5165
23911
8498
20822
27858
123894
56700
2008
27785
9854
5165
53394
23792
18873
26313
165176
2009
27785
9854
5165
53394
31978
15739
27858
171774
2010
27785
9854
5165
53394
17882
18562
27858
160501
2011
27785
9854
5165
53394
33432
16835
27858
174324
20122
27785
9854
5165
53394
9917
17289
27858
151263
16700
2013
27785
9854
5165
53394
58183
21118
27858
203358
20143
27785
9854
5165
53394
54800
29897
27858
58048
208754
2015
27785
9854
5165
53394
45449
26541
27858
47263
196047
2016
27785
9854
5165
53526
29266
20342
27630
54387
173568
20172
27785
9854
5165
45493
12223
18524
27858
38786
146903
37460
2018
27785
9854
5165
53394
45193
23095
27630
44186
192117
2019
27785
9854
5165
53394
56452
26788
27630
34035
207121
20202
27785
9854
5165
53394
47002
11475
26881
21614
181557
25148
20212
27785
9854
5165
52848
33050
26897
27630
48777
183230
10933
2022
27785
9854
5165
53395
44972
26897
26095
27630
216297
194163
2023
27785
9854
5165
53394
60456
26897
27630
42069
220847
Table A1.1. Area (NM2) covered in the bottom trawl surveys in the Barents Sea winter 1981-2023, 1994-2023 are StoX estimates.
1 Russian EEZ not covered. 2 Russian EEZ not completely covered (Strata 7 and 13 in 2006, Area D’ in 2012, strata 7, 13, 15, 7 and 20 in 2017, strata 17, 19, and 20 in 2020, and strata 16, 19, and 20 in 2021). 3 Additional northern areas (N) covered from this year.
Year
Cod
Haddock
Goldenredfish
Beakedredfish
Greenlandhalibut
Bluewhiting
Capelin
Polar cod
L
A
L
A
L
L
L
L
L
A
L
1994
57290
3400
40608
1808
3157
12389
525
1995
66264
3547
37775
1692
3785
9622
583
1996
61559
3304
34497
1416
2510
10206
587
1997
35381
2381
30054
1003
5429
10997
675
1998
39044
2843
12512
859
1739
9664
649
1999
22971
2321
12752
926
1266
6677
397
2000
31543
2871
25881
1426
1161
8739
546
9172
1860
3702
2001
36789
2998
30921
1657
1173
7323
499
8079
2402
5955
2002
45399
3730
58464
2057
1143
6660
688
10643
2387
7283
2003
59573
2857
54838
1883
1102
4654
657
10390
1742
2510
2004
40851
3175
51705
1874
1438
5507
459
11633
1994
6080
2005
33582
3216
67921
2060
835
5166
832
12482
1892
6052
2006
19319
2683
23611
1899
728
3356
962
6851
2232
1362
2007
16556
2954
26610
2023
798
4544
973
4657
5475
1186
203
2008
26844
3809
50195
2490
897
8568
1020
1350
13772
886
3166
2009
22528
3486
40872
2433
455
9205
807
891
7636
776
617
2010
30209
4085
35881
2367
429
8564
984
626
12337
1189
551
2011
26913
3959
29180
2260
286
6885
607
105
11073
829
1492
2012
17139
3020
33524
1854
574
5721
354
2441
11047
1256
601
2013
14525
2451
19142
1671
479
6087
263
1091
15962
1591
3517
2014
22624
4501
35940
2586
563
9310
444
1846
32811
3647
6879
2015
25401
3795
18483
2038
395
8933
541
1991
15578
300
408
2016
16636
3368
25423
2067
614
8668
425
2396
11423
150
681
2017
12402
2851
15689
1955
576
8898
448
4799
5140
671
578
2018
42462
5178
43294
3307
1211
11500
548
1443
16219
788
876
2019
16217
5260
15967
3072
761
8981
413
886
13771
821
748
2020
19971
3770
11047
1641
1040
11853
711
866
16801
745
1569
2021
13714
4020
15253
1950
810
11292
1076
1722
16179
1377
5567
2022
20294
4160
25161
2288
1176
9826
945
1520
18371
2072
4115
2023
11492
3472
27026
2960
696
9752
704
1571
12650
2483
793
Table A2.1. Number of fish measured for length (L) and age (A) in the Barents Sea winter survey 1994-2023.
Age/Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1994
283
354
392
652
571
363
124
54
37
16
19
3
2
-
-
-
-
-
-
-
1995
409
360
461
528
714
532
268
47
16
13
8
6
-
-
-
-
-
-
-
-
1996
304
564
359
400
462
584
384
108
23
8
6
5
3
1
-
-
-
-
-
-
1997
257
322
321
224
264
310
310
108
27
5
2
-
-
-
-
-
-
-
-
-
1998
331
311
445
425
220
242
257
193
39
6
3
-
1
-
2
-
-
-
-
-
1999
250
323
365
450
334
185
159
110
38
5
1
1
1
-
-
-
-
-
-
-
2000
256
365
470
491
578
340
119
66
50
12
4
2
1
-
-
-
-
-
-
-
2001
437
259
440
544
513
484
201
44
19
13
3
-
-
-
1
-
-
-
-
-
2002
162
650
478
661
607
506
345
90
16
7
3
-
-
-
1
-
-
-
-
-
2003
246
108
545
391
434
456
304
175
48
7
3
-
2
2
-
-
-
-
-
-
2004
311
493
260
599
368
407
387
254
87
17
6
1
1
-
-
-
-
-
-
-
2005
341
386
619
309
565
306
388
196
56
21
3
2
4
1
-
-
-
-
-
-
2006
291
364
423
521
234
430
194
162
68
18
6
3
-
-
-
-
-
-
-
-
2007
295
258
474
358
453
205
369
159
95
22
10
6
1
-
-
-
-
-
-
-
2008
169
366
676
866
471
532
246
300
72
17
2
1
1
-
-
-
-
-
-
-
2009
319
276
445
635
695
420
292
124
120
24
9
2
1
-
-
-
-
-
-
-
2010
429
369
292
489
571
745
371
247
93
64
25
2
2
3
-
-
1
-
-
-
2011
373
526
484
319
436
621
677
226
76
34
14
7
4
2
1
-
-
-
-
-
2012
275
214
319
330
198
303
504
415
100
47
25
10
9
2
1
1
-
-
-
-
2013
149
251
232
330
296
188
282
426
215
38
20
8
5
1
1
-
-
-
-
-
2014
414
301
571
387
415
341
186
368
308
89
18
12
4
1
2
1
-
-
-
-
2015
479
413
369
589
396
457
290
173
267
176
51
11
3
2
1
-
-
-
-
-
2016
235
529
405
484
678
437
418
323
164
178
86
20
15
3
3
1
1
-
-
-
2017
296
248
449
299
323
494
274
191
110
44
37
33
9
7
1
1
-
-
-
-
2018
508
762
592
901
438
491
673
338
186
91
45
51
23
4
4
3
1
-
-
-
2019
465
632
892
651
839
435
356
508
149
66
17
10
6
8
2
1
-
-
-
-
2020
265
523
755
830
585
673
432
305
310
88
41
11
16
10
10
7
-
-
-
-
2021
270
235
537
630
683
503
445
226
145
103
32
12
6
1
6
3
-
-
-
1
2022
709
340
293
450
550
530
460
378
128
53
28
17
7
-
7
1
1
3
1
-
2023
396
602
348
301
416
475
439
253
143
41
12
5
3
-
-
2
2
-
-
-
Table A2.2. Number of age samples from cod by age in the Barents Sea winter survey 1994-2023. Year-age combinations with < 5 aged individuals are highlighted in yellow. Abundance indices are still presented for ages with < 5 age samples, but note the uncertainty level (c. f. tables A5.4 and A5.8). Biological parameters by age are presented for ages with a minimum of three age readings (c. f. tables A5.10-A5.13).
Age/Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1994
212
192
250
432
219
40
4
5
8
5
13
1
-
-
-
-
-
-
1995
289
177
131
241
543
156
15
1
2
1
-
5
1
-
-
-
-
-
1996
225
236
155
106
228
343
52
9
-
1
-
2
1
-
-
-
-
-
1997
169
62
147
86
44
113
163
19
4
-
-
-
2
1
-
-
-
-
1998
151
178
68
147
74
38
73
112
12
1
1
-
-
-
2
1
-
-
1999
251
112
238
81
98
44
19
23
24
1
-
1
-
-
-
-
-
-
2000
327
321
138
344
64
72
16
3
20
9
2
1
1
-
-
-
-
-
2001
388
339
430
99
315
26
23
3
3
3
8
1
2
-
-
1
-
-
2002
445
354
382
450
84
123
19
7
1
2
5
3
2
-
-
-
-
-
2003
376
234
154
268
298
42
32
5
3
3
3
1
1
-
-
-
-
-
2004
303
464
254
232
277
251
50
22
7
4
3
1
2
3
-
-
-
-
2005
487
263
437
247
189
284
125
4
4
1
-
-
-
-
-
-
-
-
2006
458
516
141
356
166
108
104
45
4
2
-
2
-
-
1
1
-
-
2007
422
404
372
116
257
107
51
34
15
4
2
-
-
-
1
-
-
-
2008
317
525
584
470
168
237
46
23
8
1
2
1
-
-
-
-
-
-
2009
298
318
562
488
473
114
78
13
2
5
-
1
-
-
-
-
-
-
2010
448
190
272
519
462
294
41
19
8
7
2
2
-
-
-
-
-
-
2011
337
394
123
205
494
440
159
15
3
-
-
2
1
-
-
-
-
-
2012
355
112
338
58
116
408
291
73
4
6
1
3
-
-
-
-
-
-
2013
176
377
134
328
56
75
286
204
35
3
-
-
-
-
-
-
-
-
2014
449
116
455
98
202
57
96
202
90
11
4
-
-
1
-
-
-
-
2015
429
371
88
524
81
160
43
110
123
55
6
3
1
-
-
-
-
-
2016
430
282
430
99
452
88
126
87
175
129
39
6
-
2
2
1
-
-
2017
449
385
250
294
43
236
54
62
21
68
48
26
3
-
-
-
-
-
2018
704
696
596
372
424
62
160
45
44
35
56
48
19
3
-
-
-
-
2019
644
630
679
486
211
187
39
46
14
24
7
12
8
3
-
1
-
1
2020
219
359
498
622
339
141
80
22
16
10
8
13
15
10
1
-
-
-
2021
439
68
244
373
501
172
51
19
5
5
4
3
6
2
-
1
-
-
2022
618
301
68
243
305
437
99
16
4
4
6
-
-
2
-
-
-
-
2023
751
646
343
97
324
389
339
44
3
5
1
1
-
-
-
-
1
-
Table A2.3 . Number of age samples from haddock by age in the Barents Sea winter survey 1994-2023. Year-age combinations with < 5 aged individuals are highlighted in yellow. Abundance indices are still presented for ages with < 5 age samples, but note the uncertainty level (c. f. tables A6.4 and A6.8). Biological parameters by age are presented for ages with a minimum of three age readings (c. f. tables A6.10-A6.13).
Age group
Total
Biomass(‘000 t)
Area
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
A
3.04
6.65
1.97
1.87
2.53
4.13
3.19
1.78
0.55
0.24
0.00
0.00
0.00
0.00
0.00
25.9
33.1
B
1.74
0.59
2.78
3.93
3.13
4.79
4.65
3.76
3.28
0.63
0.15
0.02
0.00
0.00
0.01
29.5
82.1
C
0.79
0.62
1.10
1.27
1.55
0.84
1.21
0.97
0.58
0.11
0.01
0.00
0.00
0.00
0.00
9.06
16.9
D
17.1
22.8
9.96
8.87
12.5
10.9
7.15
2.56
1.33
0.29
0.14
0.05
0.04
0.00
0.02
93.7
85.6
D'
2.00
13.3
3.78
2.75
2.37
2.47
1.92
0.87
0.32
0.13
0.02
0.02
0.00
0.00
0.04
30.0
22.5
E
26.2
18.6
1.21
0.61
1.28
0.72
1.55
0.77
0.23
0.00
0.00
0.00
0.00
0.00
0.00
51.2
14.5
S
14.6
8.52
1.59
0.92
2.56
2.49
1.45
0.40
0.20
0.11
0.00
0.00
0.00
0.00
0.00
32.8
15.3
N
179.0
32.1
6.28
6.32
7.62
7.53
2.69
1.51
0.60
0.07
0.00
0.02
0.00
0.00
0.00
243.7
49.7
ABCD
22.7
30.7
15.8
15.9
19.7
20.6
16.2
9.07
5.74
1.26
0.31
0.07
0.04
0.00
0.04
158.1
217.8
AN
244.4
103.2
28.7
26.5
33.5
33.8
23.8
12.6
7.08
1.58
0.33
0.11
0.04
0.00
0.08
515.9
319.7
Table A5.1. COD. Abundance indices (numbers in millions) for the main areas of the Barents Sea from acoustic survey winter 2023 estimated by StoX software. Bootstrap mean estimates.
Age group
Total
Biomass(‘000 t)4
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
1994
902.64
624.38
323.88
374.47
205.53
70.24
13.00
3.59
2.60
0.71
1.15
0.11
0.13
0.00
0.00
2522.43
1060.26
1995
2175.25
212.29
137.74
139.49
197.08
66.38
15.73
2.43
0.91
0.32
0.48
0.17
0.00
0.00
0.00
2948.27
665.14
1996
1826.33
271.71
99.40
89.62
111.34
82.96
22.17
2.22
0.30
0.10
0.07
0.05
0.10
0.01
0.00
2506.38
504.47
19971
1698.49
565.31
158.57
44.22
49.91
40.91
23.48
5.02
0.84
0.27
0.09
0.00
0.00
0.01
0.00
2587.12
346.39
19981
2523.56
475.15
391.16
189.79
44.87
41.22
27.85
16.06
1.81
0.50
0.04
0.00
0.00
0.00
0.06
3712.07
563.03
1999
364.84
231.51
147.62
130.29
52.03
11.93
6.94
4.13
1.47
0.24
0.01
0.03
0.01
0.00
0.00
951.05
262.81
2000
153.42
262.81
294.83
167.25
145.55
50.75
11.33
4.70
2.75
0.85
0.18
0.11
0.03
0.00
0.00
1094.56
545.52
2001
363.55
51.45
177.44
160.63
80.80
44.47
11.10
1.73
0.46
0.19
0.08
0.00
0.00
0.00
0.01
891.91
435.40
2002
19.22
209.10
61.37
106.23
98.78
52.18
20.07
2.90
0.32
0.52
0.09
0.00
0.00
0.00
0.02
570.8
428.50
2003
1505.00
52.53
306.71
116.80
124.62
116.52
37.69
10.05
1.93
0.31
0.07
0.00
0.08
0.07
0.00
2272.38
755.03
2004
161.20
117.19
33.41
85.21
32.96
28.03
18.14
5.33
1.16
0.31
0.08
0.00
0.01
0.00
0.00
483.03
244.57
2005
499.71
138.66
125.03
33.28
65.94
21.21
15.02
4.95
1.01
0.25
0.05
0.07
0.05
0.03
0.00
905.26
259.70
20062
411.21
157.95
64.77
53.82
18.35
29.52
9.50
4.90
1.28
0.20
0.13
0.30
0.00
0.00
0.00
751.93
227.27
20071
85.13
47.09
58.49
30.40
29.35
9.04
18.07
6.41
2.67
0.53
0.24
0.07
0.00
0.00
0.00
287.49
213.63
2008
50.87
94.20
199.85
288.71
116.17
72.91
21.82
14.43
2.80
0.81
0.04
0.01
0.01
0.00
0.00
862.63
822.87
2009
204.90
25.46
107.83
182.54
138.08
41.48
13.87
4.69
4.32
0.50
0.14
0.02
0.01
0.00
0.00
723.84
536.93
2010
620.25
43.56
22.82
87.98
160.16
154.39
44.56
14.57
3.90
2.89
0.94
0.11
0.12
0.09
0.01
1156.35
885.82
2011
266.00
91.00
40.36
28.32
65.20
106.97
101.80
19.76
6.11
1.70
0.92
0.25
0.15
0.09
0.02
728.65
787.82
20123
496.49
40.23
82.79
49.38
33.77
72.53
132.31
65.59
8.37
4.39
1.21
0.66
0.47
0.04
0.10
988.33
969.09
2013
313.11
89.17
60.55
84.49
72.18
47.75
98.41
130.54
55.32
5.41
4.02
1.30
0.73
0.20
0.07
963.25
1494.33
2014
1758.58
211.04
286.89
124.18
111.14
74.47
39.41
89.89
61.31
22.64
2.56
1.31
0.16
0.05
0.19
2783.82
1437.38
2015
1903.54
211.41
138.71
235.58
128.80
140.36
80.55
35.07
53.80
24.38
7.91
0.80
0.13
0.05
0.01
2961.1
1469.58
2016
240.80
201.89
56.29
76.91
119.38
64.84
50.17
25.80
13.49
17.83
7.35
2.15
0.72
0.22
0.10
877.94
873.17
20173
439.40
73.30
111.54
42.35
44.25
65.30
35.75
24.31
11.97
4.00
2.88
3.15
0.67
0.19
0.11
859.17
680.62
2018
2057.60
280.29
109.03
149.94
53.40
54.93
66.09
34.35
10.78
6.27
1.73
2.25
1.50
0.15
0.23
2828.54
883.80
2019
1437.21
362.38
203.63
125.42
144.06
60.98
34.99
37.86
9.64
3.47
0.55
0.32
0.18
0.28
0.24
2421.21
842.03
20203
92.68
157.92
117.32
117.32
81.36
90.60
42.35
26.57
21.41
6.23
1.75
0.67
0.66
0.51
0.89
758.24
809.18
20213
45.92
28.51
64.86
59.08
55.48
38.54
30.80
12.41
6.32
4.67
2.17
0.29
0.18
0.00
0.21
349.45
400.67
2022
524.71
43.42
29.42
52.98
56.69
47.05
42.94
27.77
7.85
2.44
1.51
0.94
0.18
0.00
0.28
838.17
519.36
2023
244.43
103.24
28.66
26.54
33.54
33.83
23.81
12.62
7.08
1.58
0.33
0.11
0.04
0.00
0.08
515.90
319.74
Table A5.2. COD. Abundance indices (numbers in millions) from acoustic surveys in the Barents Sea winter 1994-2023 estimated by StoX software. Area N included from 2014 onwards. Bootstrap mean estimates.
1 Indices raised to also represent the Russian EEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices raised to also represent uncovered parts of the Russian EEZ.
4 1994-2020: bootstrap mean biomass estimated based on relationship between (unraised) numbers-at-age and biomass-at-age from StoX baseline run. From 2021: bootstrap mean biomass estimated directly in StoX; in years with adjustments for lack of coverage it is estimated based on relationship between unraised bootstrap mean numbers-at-age and unraised bootstrap mean biomass-at-age.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
2014
1112.50
53.97
54.53
11.67
14.62
7.31
2.26
4.73
2.98
0.27
0.02
0.00
0.00
0.00
0.00
1264.87
103.44
2015
589.67
88.32
25.22
49.00
12.68
11.24
5.34
1.08
3.40
1.16
0.77
0.05
0.00
0.00
0.00
787.93
122.36
2016
104.90
84.60
17.95
14.58
16.83
2.47
2.94
1.86
0.30
0.67
0.17
0.02
0.01
0.00
0.00
247.30
60.15
2017
31.09
28.70
26.54
5.44
5.68
4.13
1.54
0.65
0.24
0.05
0.28
0.04
0.00
0.00
0.00
104.37
40.15
2018
514.18
50.59
16.17
16.74
6.96
4.35
8.64
0.99
0.76
0.25
0.08
0.12
0.01
0.00
0.00
619.85
76.08
2019
371.39
75.30
20.87
27.74
20.56
7.98
3.63
5.27
0.42
0.44
0.14
0.04
0.01
0.03
0.00
533.82
112.10
2020
12.66
13.01
16.05
11.60
12.75
7.53
3.10
1.87
2.67
0.44
0.25
0.09
0.06
0.00
0.08
82.15
71.84
2021
3.35
1.85
4.11
6.72
4.13
3.70
1.61
0.45
0.20
0.21
0.01
0.01
0.00
0.00
0.01
26.36
24.23
2022
135.8
14.0
10.4
12.1
9.16
4.19
2.53
1.13
0.21
0.08
0.04
0.00
0.01
0.00
0.01
189.6
40.6
2023
179.0
32.1
6.28
6.32
7.62
7.53
2.69
1.51
0.60
0.07
0.00
0.02
0.00
0.00
0.00
243.7
49.7
Table A5.3. COD. Abundance indices (numbers in millions) for new strata 24-26 from acoustic surveys in the Barents Sea winter 2014-2023 estimated by StoX software. 2014-2020: baseline estimates, from 2021: bootstrap mean estimates.
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
30
41
29
12
7
10
13
19
20
29
29
69
89
-
1995
14
24
15
9
7
8
12
23
26
35
54
50
-
-
1996
11
15
14
10
10
11
14
16
29
43
58
54
100
110
19971
33
29
14
11
10
10
8
13
22
54
63
-
-
129
19981
23
18
11
9
10
8
8
11
22
36
45
-
101
-
1999
22
23
17
15
10
11
11
13
25
58
114
121
107
-
2000
31
26
17
10
7
10
17
21
22
42
72
68
110
-
2001
13
15
11
9
10
9
13
22
32
36
78
-
-
-
2002
18
16
10
6
7
10
15
17
32
78
73
-
-
-
2003
26
31
15
13
8
8
13
17
20
40
59
-
99
94
2004
18
16
13
10
10
10
9
13
16
45
58
95
125
-
2005
26
49
19
14
14
14
12
20
26
24
62
90
49
91
20062
24
14
11
8
8
10
16
18
19
37
61
66
-
-
20071
27
24
14
14
11
17
21
24
27
36
42
44
92
-
2008
18
24
15
16
13
10
16
14
20
44
75
65
100
-
2009
21
20
26
22
18
17
13
14
19
32
45
71
112
-
2010
36
17
19
25
17
12
11
13
17
22
28
86
74
70
2011
13
27
12
11
11
10
9
15
28
29
35
39
66
86
20122
36
14
53
11
19
19
17
13
19
35
33
55
52
81
2013
15
21
13
9
11
11
14
11
18
35
44
55
66
108
2014
15
10
11
10
13
8
11
11
14
21
30
53
59
96
2015
27
22
15
15
10
14
18
21
19
29
48
55
63
70
2016
36
20
13
13
11
15
17
16
23
23
32
46
55
87
20172
15
19
12
11
10
8
11
14
21
22
19
25
31
58
2018
11
9
9
9
9
8
8
13
15
24
24
33
53
51
2019
12
12
8
7
6
11
12
10
14
23
32
55
49
60
20202
15
15
10
7
10
11
15
16
18
23
29
38
31
38
20212
32
42
34
21
13
13
17
16
20
20
29
44
69
175
2022
20
25
20
17
11
11
19
21
31
36
48
52
74
-
2023
30
14
13
13
12
11
9
11
16
22
43
71
72
-
Table A5.4. COD. Estimates of coefficients of variation (%) for acoustic abundance indices. Barents Sea winter 1994-2023.
1 REZ not covered
2 REZ partly covered
Age group
Total
Biomass(‘000 t)
Area
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
A
2.95
6.24
1.79
1.59
2.30
4.82
3.34
1.90
0.49
0.33
0.00
0.00
0.00
0.00
0.00
25.8
34.5
B
0.59
0.19
1.02
1.28
1.15
1.72
2.43
1.45
2.40
0.13
0.05
0.00
0.00
0.00
0.00
12.4
37.7
C
0.88
0.59
0.98
1.55
2.36
0.85
1.17
1.26
0.42
0.15
0.02
0.00
0.00
0.00
0.00
10.2
18.7
D
19.0
30.0
14.9
12.0
14.7
12.0
11.9
2.67
1.69
0.37
0.16
0.05
0.05
0.00
0.03
119.5
109.2
D'
6.28
39.2
9.97
9.74
7.36
7.10
5.88
3.44
0.92
0.36
0.10
0.05
0.00
0.00
0.10
90.5
73.5
E
28.7
27.8
0.63
1.37
1.36
0.65
1.10
0.59
0.29
0.00
0.00
0.00
0.00
0.00
0.00
62.5
13.8
S
32.0
17.5
4.07
3.29
7.92
6.56
4.07
1.06
0.51
0.15
0.01
0.01
0.01
0.00
0.01
77.2
40.6
N
215.0
41.5
7.82
9.03
9.40
9.45
2.37
1.88
0.77
0.11
0.00
0.02
0.00
0.00
0.00
297.3
60.6
ABCD
23.4
37.0
18.7
16.4
20.5
19.4
18.8
7.28
4.99
0.97
0.23
0.05
0.05
0.00
0.03
167.9
200.1
AN
305.4
163.1
41.2
39.8
46.5
43.2
32.2
14.3
7.49
1.58
0.34
0.14
0.06
0.00
0.14
695.4
388.6
Table A5.5. COD. Abundance indices from bottom trawl hauls for main areas of the Barents Sea winter 2023 (numbers in millions). Bootstrap mean estimates.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
1994
1043.78
556.68
293.92
307.04
153.33
45.72
7.95
2.61
1.48
0.55
0.55
0.08
0.05
0
0
2413.74
763.41
1995
5356.43
541.25
282.84
242.36
251.01
76.42
17.98
2.42
1.07
0.50
0.61
0.19
0
0
0
6773.08
937.79
1996
5899.23
791.62
163.08
117.43
138.59
108.88
24.43
2.64
0.37
0.17
0.12
0.07
0.07
0.02
0
7246.72
718.00
19971
5044.09
1422.92
317.99
68.44
74.26
59.99
26.67
4.85
0.64
0.91
0.08
0
0
0
0
7020.84
558.85
19981
2490.54
496.48
355.10
166.94
31.67
26.15
17.52
8.16
0.79
0.52
0.04
0
0
0
0.04
3593.95
432.77
1999
473.04
350.21
188.48
180.75
61.39
12.71
6.81
5.14
1.01
0.26
0.02
0.04
0.02
0
0
1279.88
322.68
2000
128.57
242.33
245.81
130.03
111.73
26.75
4.56
1.84
1.21
0.33
0.10
0.03
0.02
0
0
893.31
363.23
2001
712.77
78.03
182.79
195.11
82.90
37.96
9.45
1.17
0.44
0.19
0.04
0
0
0
0.01
1300.86
436.57
2002
34.11
418.73
118.36
137.56
108.95
45.79
14.40
2.20
0.32
0.18
0.05
0
0
0
0.02
880.67
447.43
2003
3022.23
65.78
376.70
126.31
93.93
66.88
17.50
4.67
1.02
0.17
0.04
0
0.02
0.02
0
3775.27
546.13
2004
322.87
242.94
63.88
184.62
53.46
43.24
30.59
6.85
1.65
0.28
0.07
0.01
0.01
0
0
950.47
415.07
2005
853.43
216.67
248.88
55.06
102.97
22.38
16.36
3.81
0.92
0.30
0.04
0.02
0.04
0.04
0
1520.92
359.76
20062
674.21
289.39
116.49
115.38
28.32
43.42
13.72
5.24
1.36
0.24
0.18
0.18
0
0
0
1288.13
334.94
20071
594.69
369.74
361.13
127.73
68.51
13.65
23.60
6.82
2.30
0.41
0.11
0.10
0
0
0
1568.79
444.84
2008
68.83
101.96
194.37
300.59
111.90
40.24
17.34
8.11
1.79
0.36
0.03
0.02
0.01
0
0
845.55
686.98
2009
389.48
35.59
126.28
196.70
220.23
60.69
17.90
9.02
5.24
0.51
0.17
0.03
0.04
0
0
1061.88
757.32
2010
1027.59
95.14
36.81
114.25
154.80
144.50
39.56
11.24
3.67
1.60
0.58
0.04
0.02
0.04
0.02
1629.86
827.36
2011
617.18
225.81
85.40
50.37
129.70
138.66
103.51
16.37
4.36
1.20
0.82
0.19
0.14
0.04
0.02
1373.77
891.44
20123
702.97
100.30
75.72
64.59
33.71
90.69
132.58
48.61
9.02
2.26
0.88
0.55
0.44
0.07
0.05
1262.44
879.93
2013
435.72
142.96
68.84
114.09
63.18
40.43
64.54
76.38
33.52
2.22
2.87
0.40
0.35
0.06
0.03
1045.59
951.73
2014
1245.71
191.48
226.85
93.79
88.59
56.39
32.74
53.05
36.19
9.81
1.01
0.95
0.15
0.02
0.08
2036.81
897.87
2015
1642.00
342.76
144.07
228.25
147.29
113.53
74.43
29.22
53.51
18.08
3.38
0.75
0.12
0.07
0.04
2797.50
1338.73
2016
312.16
305.57
99.37
135.48
188.31
113.47
72.33
28.56
13.17
16.06
6.77
0.97
0.52
0.17
0.14
1293.05
1085.06
20173
644.51
128.92
179.25
62.15
84.54
90.16
37.82
26.33
8.18
3.26
2.61
3.70
0.58
0.17
0.06
1272.24
753.67
2018
2714.35
500.69
139.41
184.78
61.81
64.17
73.88
25.88
9.28
5.87
1.29
2.46
1.23
0.13
0.37
3785.60
908.45
2019
1790.57
559.44
281.57
179.15
221.90
79.65
32.96
38.31
8.15
2.62
0.54
0.24
0.16
0.18
0.12
3195.56
974.96
20203
164.75
273.82
237.73
160.24
131.56
114.88
49.83
24.26
20.44
4.53
1.66
0.93
0.51
0.26
0.73
1186.13
857.96
20213
80.88
34.87
111.50
119.35
112.31
54.28
37.98
13.57
7.27
3.53
1.25
0.42
0.25
0.04
0.32
577.83
528.35
2022
667.82
65.64
51.98
88.68
86.60
66.51
44.60
30.42
5.70
2.29
2.08
1.49
0.16
0.00
0.90
1114.9
634.0
2023
305.40
163.06
41.21
39.82
46.52
43.17
32.24
14.26
7.49
1.58
0.34
0.14
0.06
0.00
0.14
695.4
458.72
Table A5.6. COD. Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea winter 1994-2023. Area N included from 2014 onwards. Bootstrap mean estimates.
1 Indices raised to also represent the Russian EEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices raised to also represent uncovered parts of the Russian EEZ.
4 1994-2020: bootstrap mean biomass estimated based on relationship between (unraised) numbers-at-age and biomass-at-age from StoX baseline run. From 2021: bootstrap mean biomass estimated directly in StoX; in years with adjustments for lack of coverage it is estimated based on relationship between unraised bootstrap mean numbers-at-age and unraised bootstrap mean biomass-at-age.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
2014
713.08
77.53
42.89
18.72
15.38
9.93
2.90
5.31
3.65
0.55
0.06
0.01
0.00
0.00
0.00
890.00
117.15
2015
403.27
85.44
26.44
46.50
20.73
11.77
5.27
1.82
2.47
1.44
0.45
0.06
0.00
0.00
0.00
605.64
129.79
2016
101.28
92.79
27.21
24.25
28.17
9.40
5.58
2.52
0.61
0.96
0.35
0.05
0.02
0.00
0.00
293.19
109.39
2017
182.91
49.50
60.34
27.67
28.94
31.41
10.26
3.29
0.60
0.26
0.33
0.08
0.00
0.00
1.72
397.32
187.18
2018
1010.90
115.27
29.03
42.62
13.37
11.59
14.39
4.05
1.55
0.40
0.19
0.24
0.03
0.00
0.00
1243.61
170.48
2019
493.52
119.15
40.37
33.55
42.75
12.63
6.88
8.39
1.43
0.61
0.14
0.08
0.02
0.06
0.00
759.60
190.84
2020
25.44
30.50
36.58
33.77
22.46
21.42
8.16
4.32
3.99
0.85
0.44
0.06
0.11
0.00
0.09
188.20
162.34
2021
31.98
12.50
22.74
32.50
26.64
14.80
7.51
1.66
1.13
0.86
0.04
0.08
0.00
0.00
0.02
152.45
115.76
2022
158.91
18.08
15.83
22.22
21.53
9.86
6.33
3.96
0.58
0.26
0.15
0.00
0.02
NA
0.03
257.76
99.69
2023
215.0
41.5
7.82
9.03
9.40
9.45
2.37
1.88
0.77
0.11
0.00
0.02
0.00
0.00
0.00
297.3
60.6
Table A5.7. COD. Abundance indices (numbers in millions) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023. Bootstrap mean estimates.
Age group
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1994
7
15
10
10
10
9
13
24
23
25
18
72
69
-
-
1995
8
14
11
12
10
10
12
23
33
27
42
39
-
-
-
1996
7
12
19
10
12
9
13
13
25
40
50
39
48
92
-
19971
27
29
17
14
13
10
9
15
21
56
70
-
-
-
-
19981
8
12
15
11
11
11
8
10
17
48
61
-
95
-
68
1999
18
28
17
14
9
10
14
29
22
62
106
95
91
-
-
2000
12
18
15
8
9
10
12
11
15
32
55
65
84
-
-
2001
11
15
17
14
10
11
16
23
28
36
57
-
-
-
96
2002
13
23
24
7
9
13
9
14
26
40
63
-
-
-
93
2003
25
33
26
19
8
7
10
12
17
40
55
-
71
69
-
2004
12
13
19
14
10
12
14
12
14
36
40
106
101
-
-
2005
9
18
27
20
18
14
11
10
16
23
61
66
49
94
-
20062
12
13
14
27
17
13
21
12
17
27
55
63
-
-
-
20071
25
21
16
25
7
10
10
14
19
19
34
47
84
-
-
2008
9
16
16
23
31
9
37
14
25
24
70
83
99
-
-
2009
10
10
16
11
19
13
16
23
22
31
33
61
91
-
-
2010
33
10
13
19
13
10
21
11
22
21
25
71
57
60
-
2011
6
24
11
15
16
10
9
10
26
19
48
36
58
64
99
20122
9
14
13
12
15
20
20
12
24
19
23
39
52
76
100
2013
10
19
14
17
12
10
12
10
17
21
55
34
43
102
94
2014
11
9
10
11
11
7
16
12
11
19
26
33
61
117
68
2015
7
19
12
13
15
16
27
21
40
16
21
28
74
71
82
2016
9
11
15
11
8
17
19
11
15
25
20
33
31
53
52
20172
10
11
12
14
26
15
19
23
11
18
20
26
43
37
96
2018
6
14
7
9
8
12
8
12
12
29
20
34
48
46
48
2019
8
8
9
9
16
16
12
8
14
15
24
35
40
35
82
20202
14
10
13
16
11
11
12
10
12
14
21
52
29
39
30
20212
15
10
16
11
10
12
10
16
15
13
24
38
68
91
46
2022
7
12
22
21
15
10
16
18
15
27
58
72
41
-
91
2023
23
9
11
11
10
9
9
10
20
18
39
45
62
-
-
Table A5.8. COD. Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea winter 1994-2023.
1 REZ not covered.
2 REZ partly covered.
Age
Year
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
Acoustic investigations
1994-95
1.45
1.51
0.84
0.64
1.13
1.50
1.68
1.37
1995-96
2.08
0.76
0.43
0.23
0.87
1.10
1.96
2.09
1996-97
1.17
0.54
0.81
0.59
1.00
1.26
1.49
0.97
1997-98
1.27
0.37
-0.18
-0.01
0.19
0.38
0.38
1.02
1998-99
2.39
1.17
1.10
1.29
1.32
1.78
1.91
2.39
1999-00
0.33
-0.24
-0.12
-0.11
0.02
0.05
0.39
0.41
2000-01
1.09
0.39
0.61
0.73
1.19
1.52
1.88
2.32
2001-02
0.55
-0.18
0.51
0.49
0.44
0.80
1.34
1.69
2002-03
-1.01
-0.38
-0.64
-0.16
-0.17
0.33
0.69
0.41
2003-04
2.55
0.45
1.28
1.27
1.49
1.86
1.96
2.16
2004-05
0.15
-0.06
0.00
0.26
0.44
0.62
1.30
1.66
2005-06
1.15
0.76
0.84
0.60
0.80
0.80
1.12
1.35
2006-07
2.17
0.99
0.76
0.61
0.71
0.49
0.39
0.61
2007-08
-0.10
-1.45
-1.60
-1.34
-0.91
-0.88
0.22
0.83
2008-09
0.69
-0.14
0.09
0.74
1.03
1.66
1.54
1.21
2009-10
1.55
0.11
0.20
0.13
-0.11
-0.07
-0.05
0.18
2010-11
1.92
0.08
-0.22
0.30
0.40
0.42
0.81
0.87
2011-12
1.89
0.09
-0.20
-0.18
-0.11
-0.21
0.44
0.86
2012-13
1.72
-0.41
-0.02
-0.38
-0.35
-0.31
0.01
0.17
2013-14
0.39
-1.17
-0.72
-0.27
-0.03
0.19
0.09
0.76
2014-15
2.12
0.42
0.20
-0.04
-0.23
-0.08
0.12
0.51
2015-16
2.24
1.32
0.59
0.68
0.69
1.03
1.14
0.96
2016-17
1.19
0.59
0.28
0.55
0.60
0.60
0.72
0.77
2017-18
0.45
-0.40
-0.30
-0.23
-0.22
-0.01
0.04
0.81
2018-19
1.74
0.32
-0.14
0.04
-0.13
0.45
0.56
1.27
2019-20
2.21
1.13
0.55
0.43
0.46
0.36
0.28
0.57
2020-21
1.41
0.93
0.73
0.79
0.77
1.11
1.26
1.54
2021-22
0.06
-0.03
0.20
0.04
0.16
-0.11
0.10
0.46
2022-23
1.63
0.42
0.1
0.46
0.52
0.68
1.22
1.37
Bottom trawl investigations
1994-95
0.66
0.68
0.19
0.20
0.70
0.93
1.19
0.89
1995-96
1.91
1.20
0.88
0.56
0.84
1.14
1.92
1.88
1996-97
1.42
0.91
0.87
0.46
0.84
1.41
1.62
1.42
1997-98
2.32
1.39
0.64
0.77
1.04
1.23
1.18
1.81
1998-99
1.96
0.97
0.68
1.00
0.91
1.35
1.23
2.09
1999-00
0.67
0.35
0.37
0.48
0.83
1.03
1.31
1.45
2000-01
0.50
0.28
0.23
0.45
1.08
1.04
1.36
1.43
2001-02
0.53
-0.42
0.28
0.58
0.59
0.97
1.46
1.30
2002-03
-0.66
0.11
-0.07
0.38
0.49
0.96
1.13
0.77
2003-04
2.52
0.03
0.71
0.86
0.78
0.78
0.94
1.04
2004-05
0.40
-0.02
0.15
0.58
0.87
0.97
2.08
2.01
2005-06
1.08
0.62
0.77
0.66
0.86
0.49
1.14
1.03
2006-07
0.60
-0.22
-0.09
0.52
0.73
0.61
0.70
0.82
2007-08
1.76
0.64
0.18
0.13
0.53
-0.24
1.07
1.34
2008-09
0.66
-0.21
-0.01
0.31
0.61
0.81
0.65
0.44
2009-10
1.41
-0.03
0.10
0.24
0.42
0.43
0.47
0.90
2010-11
1.52
0.11
-0.31
-0.13
0.11
0.33
0.88
0.95
2011-12
1.82
1.09
0.28
0.40
0.36
0.04
0.76
0.60
2012-13
1.59
0.38
-0.41
0.02
-0.18
0.34
0.55
0.37
2013-14
0.82
-0.46
-0.31
0.25
0.11
0.21
0.20
0.75
2014-15
1.29
0.28
-0.01
-0.45
-0.25
-0.28
0.11
-0.01
2015-16
1.68
1.24
0.06
0.19
0.26
0.45
0.96
0.80
2016-17
0.88
0.53
0.47
0.47
0.74
1.10
1.01
1.25
2017-18
0.25
-0.08
-0.03
0.01
0.28
0.20
0.38
1.04
2018-19
1.58
0.58
-0.25
-0.18
-0.25
0.67
0.66
1.16
2019-20
1.88
0.86
0.56
0.31
0.66
0.47
0.31
0.63
2020-21
1.55
0.90
0.69
0.36
0.89
1.11
1.30
1.21
2021-22
0.21
-0.40
0.23
0.32
0.52
0.20
0.22
0.87
2022-23
1.41
0.47
0.27
0.65
0.70
0.72
1.14
1.40
Table A5.9. COD. Survey mortality from surveys in the Barents Sea winter 1994-2023.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
11.3
17.9
30.2
44.6
55.2
65.7
73.9
78.9
87.4
97.2
97.6
104.7
+
-
1995
12.2
18.1
29.0
42.2
53.9
63.9
75.4
80.4
85.9
99.1
90.1
109.0
-
-
1996
12.1
18.8
28.8
40.5
49.4
60.9
71.8
85.1
92.4
94.9
96.1
104.2
103.9
+
19971
10.8
16.9
29.7
41.0
50.6
59.4
69.6
81.2
92.3
80.4
+
-
-
-
19981
10.5
17.8
30.8
40.9
50.9
58.5
67.7
76.7
87.2
103.0
111.4
-
+
-
1999
12.0
18.4
29.0
40.0
50.4
59.4
70.4
78.4
88.5
87.6
+
+
+
-
2000
12.8
20.7
28.4
39.7
51.5
61.4
70.4
76.3
84.9
84.3
100.0
+
+
-
2001
11.6
22.6
33.0
41.2
52.2
63.3
70.4
78.3
86.0
95.7
104.7
-
-
-
2002
12.0
19.6
28.9
43.6
52.1
61.9
71.4
79.5
91.2
89.7
103.7
-
-
-
2003
11.4
18.1
29.1
39.7
53.4
61.7
70.6
80.8
89.1
90.1
105.4
-
+
+
2004
10.6
18.4
31.7
40.6
51.7
61.6
68.6
79.7
90.9
90.4
92.2
+
+
-
2005
11.2
18.3
29.5
43.4
51.1
60.4
71.0
79.6
89.0
96.4
109.3
+
129.6
+
20062
12.0
19.4
30.9
42.1
53.8
60.3
66.7
76.7
84.9
98.9
95.4
84.9
-
-
20071
13.2
20.7
29.6
41.1
52.8
62.5
70.4
78.2
87.5
92.7
101.8
121.6
+
-
2008
12.1
22.3
33.0
43.2
51.8
64.0
69.9
81.3
88.7
95.3
+
+
+
-
2009
11.2
21.1
32.1
42.6
53.2
61.9
76.6
81.8
89.5
97.8
99.5
+
+
-
2010
11.2
18.4
31.4
42.7
52.4
60.7
70.5
80.4
88.8
96.3
102.2
+
+
126.0
2011
11.9
19.5
29.4
41.9
51.0
60.7
68.1
78.3
86.1
95.4
102.2
110.4
114.3
+
20122
10.6
18.4
29.7
41.0
52.4
58.1
66.5
75.6
86.0
91.8
105.9
114.0
119.0
+
2013
11.2
19.3
31.1
41.1
51.7
62.0
69.7
76.5
81.2
95.3
93.7
110.7
110.8
+
2014
9.7
17.1
29.5
40.5
52.0
59.6
70.2
76.8
81.8
87.1
97.4
98.9
107.8
+
2015
10.5
15.9
30.0
40.3
51.1
60.2
68.8
77.5
81.2
88.7
94.0
101.9
127.5
+
2016
12.2
18.3
27.7
40.6
49.8
60.5
68.3
76.6
85.5
86.5
90.5
94.1
112.0
122.5
20172
12.3
22.2
31.2
42.5
51.2
60.5
69.6
75.5
85.2
90.9
96.0
92.6
108.6
108.7
2018
11.2
19.1
32.7
42.4
51.2
61.6
69.0
77.5
83.4
87.6
97.0
99.3
101.8
106.8
2019
11.7
17.5
31.2
42.4
51.0
59.6
69.7
77.0
84.1
87.1
99.3
103.4
104.6
109.8
20202
12.0
17.5
25.5
39.5
50.2
58.6
66.7
74.8
83.0
90.0
93.9
92.4
111.2
113.9
20212
11.6
19.9
26.5
37.4
48.0
58.5
66.7
74.9
84.0
91.7
97.7
102.1
105.8
+
2022
10.8
20.4
32.4
39.1
49.3
58.4
68.7
75.3
84.1
92.5
98.2
102.6
113.2
-
2023
11.4
19.7
32.3
42.2
50.0
59.1
67.6
75.9
81.7
86.8
104.2
104.1
115.6
-
Table A5.10. COD. Mean length (cm) at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates. “+” indicates few samples (< 3), while “–“ indicates no samples. Lengths are not adjusted for incomplete coverage.
1 REZ not covered.
2 REZ partly covered.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
13
56
262
796
1470
2386
3481
4603
6777
8195
8516
13972
+
-
1995
15
54
240
658
1336
2207
3570
4715
5712
8816
6817
12331
-
-
1996
15
62
232
627
1084
1980
3343
5514
7722
8873
9613
12865
12556
+
19971
13
52
230
638
1175
1797
2931
4875
7529
5739
+
-
-
-
19981
11
52
280
635
1182
1728
2588
4026
6076
11257
14391
-
+
-
1999
14
59
231
592
1178
1829
2991
4128
6321
7342
+
+
+
-
2000
16
74
210
558
1210
1963
3036
3867
5401
6154
10023
+
+
-
2001
14
106
336
646
1288
2233
3088
4439
5732
8442
11429
-
-
-
2002
14
67
238
747
1229
2063
3199
4578
7525
6598
12292
-
-
-
2003
13
61
234
597
1316
2014
2989
4715
6517
7500
12812
-
+
+
2004
11
59
275
608
1143
1947
2623
4137
6673
7368
8109
+
+
-
2005
13
61
246
723
1146
1866
2949
4226
6436
8646
12537
+
24221
-
20062
13
69
280
669
1420
1970
2641
4260
5914
10179
9439
8328
-
-
20071
19
73
235
639
1302
2190
3039
4411
6394
8056
10826
20104
+
-
2008
15
90
335
798
1399
2442
3235
5210
6981
9641
+
+
+
-
2009
13
83
294
704
1302
2065
4067
5087
6874
9460
9511
+
+
-
2010
12
64
304
700
1296
2033
3162
4743
6562
8984
10315
+
+
22766
2011
15
66
246
668
1131
1940
2726
4013
5969
8275
10309
13159
14868
+
20122
13
62
252
609
1276
1681
2489
3764
5920
7809
12199
15006
17582
+
2013
11
65
269
602
1208
2055
2809
3843
4822
8447
9101
15108
14743
+
2014
8
50
246
603
1226
1780
2866
3930
4927
6203
8570
9566
12239
+
2015
10
44
242
602
1221
1929
2741
4043
4804
6817
7759
11544
21652
+
2016
13
53
200
593
1049
1928
2674
3830
5540
6129
7110
8272
15256
21945
20172
15
102
292
720
1178
1972
3056
3962
5901
7429
9301
8599
12958
14894
2018
12
69
320
688
1228
2062
2803
4154
5409
6632
9156
10510
11810
12443
2019
12
48
273
685
1164
1870
2916
3974
5394
6068
9637
11507
12371
13993
20202
14
44
153
548
1077
1692
2476
3625
5074
6758
8040
8107
14892
15793
20212
14
68
164
462
910
1682
2484
3620
5379
7160
9313
10923
12410
+
2022
11
77
311
535
1052
1716
2885
3855
5321
7751
9538
11432
14940
-
2023
12
71
316
694
1111
1757
2802
4097
5119
6443
10937
10668
14732
-
Table A5.11. COD. Mean weight (g) at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates. “+” indicates few samples (< 3), while “–“ indicates no samples. Weights are not adjusted for incomplete coverage.
1 REZ not covered.
2 REZ partly covered.
Year\Age
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
9-10
1994-95
41
184
396
540
737
1184
1234
1109
2039
1995-96
47
178
387
426
644
1136
1944
3007
3161
1996-97
37
168
406
548
713
951
1532
2015
-1983
1997-98
39
228
405
544
553
791
1095
1201
3728
1998-99
48
179
312
543
647
1263
1540
2295
1266
1999-00
60
151
327
618
785
1207
876
1273
-167
2000-01
90
262
436
730
1023
1125
1403
1865
3041
2001-02
53
132
411
583
775
966
1490
3086
866
2002-03
47
167
359
569
785
926
1516
1939
-25
2003-04
46
214
374
546
631
609
1148
1958
851
2004-05
50
187
448
538
723
1002
1603
2299
1973
2005-06
56
219
423
697
824
775
1311
1688
3743
2006-07
60
166
359
633
770
1069
1770
2134
2142
2007-08
71
262
563
760
1140
1045
2171
2570
3247
2008-09
68
204
369
504
666
1625
1852
1664
2479
2009-10
51
221
406
592
731
1097
676
1475
2110
2010-11
54
182
364
431
644
693
851
1226
1713
2011-12
47
186
363
608
550
549
1038
1907
1840
2012-13
52
207
350
599
779
1128
1354
1058
2527
2013-14
39
181
334
624
572
811
1121
1084
1381
2014-15
36
192
356
618
703
961
1177
874
1890
2015-16
43
156
351
447
707
745
1089
1497
1325
2016-17
89
239
520
585
923
1128
1288
2071
1889
2017-18
54
218
396
508
884
831
1098
1447
731
2018-19
36
204
365
476
642
854
1171
1240
659
2019-20
32
105
275
392
528
606
709
1100
1364
2020-21
54
120
309
362
605
792
1144
1754
2086
2021-22
63
243
371
590
806
1203
1371
1701
2372
2022-23
60
239
383
576
705
1086
1212
1264
1122
Table A5.12. COD. Yearly weight increment (g) from bottom trawl surveys in the Barents Sea winter 1994-2023.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
0.00
0.00
0.00
0.00
0.06
0.14
0.31
0.71
0.92
1.00
0.83
1.00
+
-
1995
0.00
0.00
0.00
0.01
0.05
0.26
0.32
0.51
0.85
0.91
1.00
1.00
-
-
1996
0.00
0.00
0.00
0.00
0.01
0.16
0.33
0.51
1.00
1.00
1.00
1.00
1.00
+
1997
0.00
0.00
0.00
0.00
0.01
0.08
0.38
0.80
1.00
0.83
+
-
-
-
1998
0.00
0.00
0.00
0.01
0.04
0.18
0.33
0.64
0.84
1.00
-
+
-
-
1999
-
0.00
0.00
0.00
0.01
0.12
0.37
0.70
0.88
+
+
+
-
+
2000
0.00
0.00
0.00
0.00
0.05
0.28
0.85
0.86
1.00
1.00
+
+
-
+
2001
0.00
0.00
0.00
0.01
0.05
0.27
0.43
0.70
0.91
1.00
-
-
-
-
2002
-
0.00
0.00
0.01
0.04
0.29
0.47
0.56
0.87
1.00
-
-
-
-
2003
-
0.00
0.00
0.00
0.05
0.21
0.40
0.69
0.94
1.00
-
+
+
-
2004
-
0.00
0.00
0.01
0.05
0.25
0.53
0.72
0.87
0.88
+
+
-
+
2005
0.00
0.00
0.00
0.00
0.04
0.18
0.49
0.80
0.92
1.00
1.00
+
1.00
-
2006
0.00
0.00
0.00
0.03
0.05
0.20
0.39
0.74
0.72
1.00
1.00
1.00
-
-
2007
0.00
0.00
0.00
0.01
0.05
0.33
0.57
0.84
0.98
1.00
1.00
1.00
+
-
2008
0.00
0.00
0.01
0.01
0.12
0.32
0.54
0.74
0.82
1.00
1.00
+
+
-
2009
0.00
0.00
0.00
0.00
0.08
0.25
0.49
0.64
0.91
0.96
0.86
+
+
-
2010
-
0.00
0.01
0.01
0.10
0.37
0.50
0.79
0.89
0.95
0.93
+
+
1.00
2011
0.00
0.00
0.00
0.00
0.03
0.22
0.43
0.54
0.84
0.88
1.00
1.00
1.00
+
2012
0.00
0.00
0.00
0.00
0.09
0.21
0.42
0.67
0.85
0.93
1.00
1.00
1.00
+
2013
0.00
0.00
0.00
0.00
0.01
0.11
0.40
0.69
0.79
0.98
0.95
1.00
1.00
+
2014
0.00
0.00
0.00
0.00
0.03
0.10
0.41
0.76
0.87
0.97
0.98
0.96
1.00
+
2015
0.00
0.00
0.00
0.00
0.00
0.06
0.16
0.65
0.91
0.97
0.95
1.00
1.00
+
2016
0.00
0.00
0.00
0.00
0.00
0.04
0.16
0.54
0.78
0.95
0.95
1.00
1.00
1.00
2017
0.00
0.00
0.00
0.02
0.00
0.09
0.34
0.65
0.89
1.00
1.00
0.97
1.00
1.00
2018
0.00
0.00
0.00
0.00
0.02
0.13
0.32
0.56
0.84
0.96
1.00
0.97
0.97
1.00
2019
0.00
0.00
0.00
0.00
0.01
0.12
0.34
0.76
0.89
0.86
0.95
1.00
1.00
1.00
2020
0.00
0.00
0.00
0.00
0.01
0.11
0.29
0.63
0.82
0.89
1.00
1.00
1.00
1.00
2021
0.00
0.01*
0.00
0.00
0.00
0.14
0.33
0.58
0.84
0.95
0.96
1.00
1.00
+
2022
0.00
0.00
0.02
0.00
0.00
0.06
0.39
0.63
0.66
0.96
1.00
0.96
1.00
-
2023
0.00
0.00
0.01
0.03
0.03
0.07
0.42
0.73
0.91
0.88
1.00
1.00
1.00
-
Table A5.13. COD. Proportion mature at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimate. The proportion mature is the number of fish classified as maturity category 2 and 3, divided by the total number of fish assigned categories 1-3.
* Based on one sample only.
no. stomachs sampled
% empty stomachs
mean stomach fullness
Year
Stations
<20 cm
20-34 cm
35-49 cm
>=50 cm
<20 cm
20-34 cm
35-49 cm
>=50 cm
<20 cm
20-34 cm
35-49 cm
>=50 cm
1984
31
176
288
242
381
18.8
14.9
5.0
4.5
1.59
2.05
1.80
1.46
1985
49
106
494
582
612
44.3
34.0
19.8
20.6
1.55
3.58
4.46
3.43
1986
73
231
309
398
427
43.3
32.4
26.9
19.0
0.73
2.48
2.90
2.94
1987
52
133
415
501
409
32.3
48.9
45.3
48.9
1988
79
29
418
844
704
34.5
40.2
31.6
29.7
1.01
1.29
0.91
0.84
1989
82
82
378
890
1132
40.2
21.2
16.3
20.6
1.45
2.28
2.12
1.47
1990
60
177
300
450
870
39.0
22.7
18.4
16.4
1.84
2.18
2.01
1.60
1991
70
271
463
450
1107
40.6
25.5
11.3
9.5
0.95
2.28
3.73
4.27
1992
100
229
382
471
922
65.9
45.8
31.4
38.2
1.79
3.15
3.05
1.92
1993
117
139
393
570
1073
76.3
38.4
21.2
26.7
1.86
3.34
2.99
3.05
1994
138
296
370
580
1163
64.9
34.9
25.0
24.3
0.76
2.04
2.00
1.63
1995
161
452
517
638
1482
52.2
36.4
32.0
30.8
1.16
1.39
0.93
0.80
1996
254
483
507
540
1338
55.7
39.1
28.0
27.4
0.92
1.32
1.38
1.02
1997
149
305
337
358
1105
57.0
34.1
20.7
29.5
0.98
1.60
1.81
1.48
1998
197
496
492
564
1042
64.7
48.2
29.3
28.6
2.20
1.93
1.67
1.22
1999
211
310
471
554
849
61.3
38.6
27.4
25.9
2.11
1.90
2.06
1.76
2000
243
413
645
669
1069
53.8
28.7
21.2
21.1
1.36
1.98
2.41
1.74
2001
361
644
728
884
1485
72.4
42.3
29.3
32.2
2.32
2.98
3.33
2.79
2002
345
393
704
799
1423
69.2
42.8
30.9
30.9
1.57
2.78
2.36
1.88
2003
285
325
499
637
1468
61.5
39.5
22.6
24.4
5.55
2.78
2.55
2.28
2004
329
508
525
663
1522
51.8
37.9
24.1
27.6
1.94
2.02
1.76
1.55
2005
335
509
651
648
1423
43.6
34.7
26.5
25.4
2.29
2.22
1.79
1.65
2006
259
402
464
534
1059
59.2
42.5
21.9
24.5
1.80
1.88
2.56
1.80
2007
273
386
483
592
1341
60.6
45.3
30.7
30.1
1.68
1.87
1.83
1.50
2008
326
260
733
933
1655
61.9
38.5
26.0
23.0
1.94
2.42
2.93
2.19
2009
319
385
547
798
1657
56.1
35.1
22.3
23.9
1.57
1.89
2.02
1.58
2010
360
594
552
748
2079
51.5
38.6
23.0
25.5
1.83
2.19
2.72
2.49
2011
359
515
628
506
1821
56.7
37.7
17.2
23.9
2.08
2.06
2.47
2.49
2012
297
373
408
431
1626
42.6
27.5
13.9
21.0
1.80
2.45
2.28
1.67
2013
279
209
352
425
1435
44.0
28.4
12.7
17.2
1.49
2.25
2.36
1.93
2014
434
570
686
686
2004
42.8
26.7
18.4
19.8
1.59
2.17
2.11
1.33
2015
356
664
562
670
1735
45.8
29.9
20.1
23.1
1.53
2.09
1.96
1.59
2016
387
427
616
728
1971
52.5
32.0
25.4
24.2
1.51
1.92
2.03
1.56
2017
293
339
465
529
1416
46.0
35.5
28.5
28.2
1.90
1.99
1.66
1.50
2018
432
638
850
935
2086
44.8
28.1
19.4
17.5
1.50
2.07
2.29
1.74
2019
506
787
974
1095
2302
46.1
29.6
19.1
17.2
1.60
1.95
2.04
1.87
2020
458
633
952
992
2369
38.1
28.2
18.2
18.0
1.71
1.98
2.33
2.16
2021
447
385
824
899
1842
49.1
23.1
12.7
16.5
2.53
1.71
1.80
2.05
2022
467
824
543
787
1953
52.5
31.1
17.7
14.3
2.90
2.12
2.30
1.75
Table A5.14. Number of stations and stomachs sampled, % empty stomachs, and mean stomach fullness by length group in the Barents Sea winter 1984-2022.
Year
Amphipods
Krill
Shrimp
Other invertebrates
Capelin
Herring
Polar cod
Blue whiting
Cod
Haddock
Redfish
Long rough dab
Norway pout
Other fish
1984
1.2
7.7
37.5
4.5
13.3
35.8
1985
15.5
7.9
27.9
44.4
4.3
1986
14.3
3.8
34.0
14.4
15.2
18.3
1987
24.8
17.7
10.9
0.2
25.4
21.0
1988
3.5
19.2
64.3
13.0
1989
41.1
27.9
31.0
1990
5.5
14.2
38.4
3.7
3.8
3.2
31.2
1991
12.2
18.7
6.9
8.4
53.8
1992
3.7
3.8
6.9
54.3
17.7
13.6
1993
35.3
59.0
5.7
1994
19.1
40.8
10.9
11.6
17.6
1995
12.9
6.7
33.9
3.5
7.4
27.8
6.2
1.6
1996
16.3
25.4
15.0
27.4
9.4
6.5
1997
23.3
35.9
26.5
0.3
14.0
1998
20.9
30.3
17.2
12.4
16.9
2.3
1999
9.9
18.4
34.0
6.5
18.0
13.2
2000
3.3
57.1
17.8
0.0
17.3
4.5
2001
7.0
31.2
10.1
10.7
26.8
8.6
5.6
2002
15.0
32.1
21.1
13.9
17.9
2003
1.6
80.0
10.4
1.4
6.6
2004
11.0
44.7
5.9
9.1
14.3
4.2
10.8
2005
17.2
22.8
16.2
0.3
35.8
7.7
2006
9.7
49.9
7.8
20.5
12.1
2007
6.0
74.6
6.1
0.5
11.6
1.2
2008
7.3
47.6
31.3
8.7
0.7
0.3
4.1
2009
4.7
61.4
1.9
8.8
18.1
5.1
2010
3.5
41.7
1.4
1.6
48.2
0.7
2.9
2011
1.5
24.8
14.6
4.0
29.6
8.2
17.3
2012
4.7
20.2
8.5
4.0
53.0
9.6
2013
2.2
66.2
17.8
13.8
2014
8.9
42.6
12.7
8.9
26.8
0.1
2015
2.8
44.8
10.6
13.6
22.1
6.1
2016
15.7
39.7
9.6
5.6
21.5
7.9
2017
12.7
6.9
1.0
38.0
0.9
31.0
9.5
2018
9.0
43.9
11.2
9.6
19.0
7.3
2019
7.5
34.9
13.9
9.8
27.7
2.2
4.0
2020
10.4
53.9
4.4
9.1
13.2
2.2
1.4
5.4
2021
6.0
45.2
8.4
2.5
31.7
2.1
4.1
2022
2.7
37.3
7.6
49.9
2.5
Table A5.15. Mean stomach content composition (% of total SFI) of cod ≤ 19 cm from the survey in the Barents Sea winter 1984-2022.
Year
Amphipods
Krill
Shrimp
Other invertebrates
Capelin
Herring
Polar cod
Blue whiting
Cod
Haddock
Redfish
Long rough dab
Norway pout
Other fish
1984
0.1
0.1
21.0
2.7
40.2
8.1
26.3
0.2
1.3
1985
0.2
0.1
17.0
2.0
69.2
9.3
1.1
0.2
0.9
1986
2.0
1.1
5.9
2.8
56.2
7.0
0.8
23.3
0.9
1987
0.5
1.9
25.2
0.3
53.7
6.6
11.4
0.4
1988
0.9
0.2
20.7
7.0
52.9
18.3
1989
11.9
7.1
9.0
5.6
33.2
5.4
1.6
25.4
0.5
0.3
1990
0.6
0.5
18.5
0.7
66.7
8.4
4.6
1991
0.1
0.2
4.3
0.2
92.5
2.0
0.7
1992
0.4
0.8
6.4
1.2
88.1
0.4
2.5
0.2
1993
0.1
0.6
8.1
0.3
78.4
5.9
3.8
0.9
1.1
0.1
0.7
1994
1.2
10.2
8.3
1.7
54.9
14.2
4.8
1.7
1.2
1.8
1995
1.4
1.5
9.4
1.8
45.8
10.8
0.6
13.3
3.4
9.3
2.7
1996
1.9
0.5
13.6
1.3
48.9
5.3
24.9
1.8
0.3
0.8
0.7
1997
1.1
3.4
17.6
1.6
42.6
1.2
5.4
10.0
17.1
1998
2.2
2.6
23.5
1.6
47.8
3.4
10.3
5.6
3.0
1999
2.3
4.0
24.5
3.4
45.6
13.5
0.8
3.2
2.7
2000
0.7
8.0
14.2
0.3
59.4
4.2
5.3
3.6
2.1
0.1
2.1
2001
0.9
2.8
8.5
2.8
69.4
4.7
5.6
4.0
1.3
2002
0.5
1.6
12.2
2.9
71.2
0.7
7.0
1.9
2.0
2003
0.5
2.4
7.3
0.7
71.9
14.4
2.1
0.1
0.5
0.1
2004
2.1
5.2
9.7
1.9
60.6
5.9
6.4
1.9
4.2
2.1
2005
0.6
2.3
12.0
0.9
61.2
3.6
7.7
5.7
4.9
1.1
2006
1.4
1.5
11.8
3.2
66.6
1.6
2.8
2.1
3.4
4.9
0.7
2007
2.3
4.8
15.0
7.3
58.8
0.1
7.7
3.7
0.3
2008
0.5
3.8
11.1
4.7
63.3
3.5
2.4
4.2
1.0
5.5
2009
0.5
6.6
8.8
5.6
71.2
2.4
1.5
0.2
3.2
2010
0.7
5.2
7.4
1.8
74.2
1.0
6.4
2.2
1.1
2011
0.9
3.3
8.3
3.7
74.3
1.1
6.0
0.1
1.1
1.2
2012
0.4
2.6
7.2
2.3
77.1
0.4
7.7
2.3
2013
0.3
7.2
10.4
3.4
68.0
2.1
4.3
0.3
0.1
3.9
2014
2.6
3.5
6.3
5.8
74.7
1.7
1.5
0.1
3.8
2015
0.9
2.4
9.8
3.4
75.9
3.7
1.6
0.3
2.0
2016
2.7
5.8
9.1
6.0
65.2
3.7
0.7
6.8
2017
0.4
3.3
7.8
4.6
67.0
1.7
4.5
2.0
6.7
2.0
2018
1.2
6.5
4.9
6.5
64.6
3.0
7.8
1.7
0.1
2.0
1.7
2019
0.6
4.4
9.2
9.1
64.7
0.5
7.6
1.4
2.5
2020
2.8
12.4
7.4
7.0
64.5
1.4
0.5
0.7
0.4
2.9
2021
2.2
14.1
16.2
10.3
42.1
2.6
4.3
0.9
7.3
2022
0.8
8.4
8.0
3.4
56.1
0.4
5.1
13
0.2
1
0.5
3.1
Table A5.16. Mean stomach content composition (% of total SFI) of cod 20-34 cm from the survey in the Barents Sea winter 1984-2022.
Year
Amphipods
Krill
Shrimp
Other invertebrates
Capelin
Herring
Polar cod
Blue whiting
Cod
Haddock
Redfish
Long rough dab
Norway pout
Other fish
1984
0.5
18.2
1.3
41.5
0.7
2.6
34.5
0.1
0.6
1985
0.5
4.7
0.2
88.7
4.2
0.5
0.2
0.9
0.1
1986
0.8
2.5
6.8
3.6
58.4
12.4
15.3
0.2
1987
0.5
0.2
22.9
1.7
47.9
9.2
1.8
4.4
2.0
5.5
3.8
0.1
1988
1.0
1.9
29.1
6.3
51.2
1.5
8.8
0.2
1989
4.1
1.8
11.3
3.3
50.2
7.9
0.2
18.6
0.8
0.2
1.6
1990
0.1
0.1
7.4
1.6
84.8
2.0
1.3
2.5
0.2
1991
0.1
0.1
1.8
0.6
94.0
1.5
1.2
0.1
0.6
1992
0.1
3.3
3.7
79.7
9.1
0.3
0.3
1.2
1.7
0.6
1993
0.1
0.2
6.0
0.6
85.4
5.6
0.5
0.2
0.4
0.2
0.8
1994
0.9
14.2
6.9
1.2
48.9
13.5
9.1
2.2
0.4
0.3
2.4
1995
0.9
0.6
12.8
2.2
44.7
6.2
1.2
17.9
8.6
4.7
0.2
1996
1.8
0.7
10.0
2.2
21.6
1.5
2.1
5.5
37.4
6.7
2.5
6.9
1.1
1997
0.9
0.3
14.8
4.3
40.3
5.2
3.6
17.1
3.7
0.5
0.1
1.2
8.0
1998
1.1
0.4
23.2
6.8
50.3
8.5
1.2
1.8
4.1
1.5
0.8
0.3
1999
0.3
0.4
28.0
1.8
44.9
12.0
2.4
1.9
5.7
0.5
0.1
0.4
1.6
2000
0.9
0.3
8.2
0.6
83.5
4.1
0.4
0.7
0.3
1.0
2001
0.4
0.2
6.3
3.3
73.6
5.2
7.3
1.4
1.1
0.5
0.3
0.4
2002
0.2
0.6
10.4
4.2
68.3
2.3
4.8
0.8
3.2
3.9
0.5
0.4
0.4
2003
0.3
1.1
8.2
1.6
68.4
11.1
1.2
0.2
2.7
4.9
0.3
2004
0.9
1.6
14.5
4.5
61.7
6.5
2.3
1.0
4.1
1.5
1.0
0.4
2005
0.7
0.7
13.7
2.1
58.3
3.1
3.6
1.9
0.2
13.2
0.3
1.4
0.8
2006
0.1
0.2
13.1
1.5
64.8
2.0
1.3
1.6
1.1
12.7
0.2
0.3
1.1
2007
3.5
0.8
18.7
2.4
47.6
7.8
0.2
1.1
13.1
0.4
0.4
3.3
0.7
2008
0.3
0.9
11.7
1.3
71.9
2.7
7.4
0.9
1.1
0.3
0.4
1.1
2009
0.8
1.7
6.9
6.9
75.9
1.8
2.4
1.7
0.4
0.6
0.1
0.8
2010
1.0
1.2
6.3
1.3
81.2
0.4
0.3
2.2
3.6
1.4
0.1
0.6
0.4
2011
0.1
0.7
7.5
3.2
76.0
1.5
1.4
4.2
0.9
2.3
0.1
1.4
0.7
2012
0.5
0.9
7.7
4.3
71.2
0.5
0.8
0.3
4.2
4.4
0.8
0.3
2.6
1.5
2013
0.4
1.5
7.9
4.6
77.9
1.1
3.3
1.6
0.3
0.1
0.3
1.0
2014
0.3
0.6
10.5
3.9
74.4
1.8
1.6
4.3
0.6
0.1
0.9
1.0
2015
0.5
3.2
7.9
2.3
77.1
1.3
0.2
2.3
2.4
1.1
0.3
0.4
1.0
2016
3.3
1.0
8.8
5.7
68.2
1.3
2.2
5.7
1.1
0.7
0.7
1.3
2017
0.1
1.1
12.3
4.1
70.5
0.4
5.6
0.7
2.6
2.6
2018
0.2
2.0
6.5
2.4
70.0
5.9
7.0
5.0
0.3
0.2
0.5
2019
0.5
1.1
9.8
3.0
69.8
3.9
6.1
4.0
0.4
0.1
1.3
2020
1.6
2.5
7.5
3.1
81.1
2.0
1.5
0.1
0.2
0.2
0.2
2021
2.6
3.5
20.0
5.7
55.9
1.4
2.6
0.4
0.6
0.6
4.7
0.5
1.5
2022
0.6
3.2
9.7
2.7
67.2
0.3
3.2
5.7
3.7
2.1
0.4
1.2
Table A5.17. Mean stomach content composition (% of total SFI) of cod 35-49 cm from the survey in the Barents Sea winter 1984-2022.
Year
Amphipods
Krill
Shrimp
Other invertebrates
Capelin
Herring
Polar cod
Blue whiting
Cod
Haddock
Redfish
Long rough dab
Norway pout
Other fish
1984
0.4
16.3
1.3
48.1
0.6
3.5
2.4
26.4
0.3
0.7
1985
0.2
5.2
0.4
85.8
3.0
0.3
2.1
0.6
1.2
1.1
0.1
1986
0.6
0.2
4.4
3.9
53.9
3.2
2.5
9.5
7.9
7.7
0.1
4.1
2.0
1987
1.9
0.1
7.4
6.5
2.2
3.6
3.1
3.3
15.6
35.3
0.3
18.9
1.8
1988
0.9
0.7
11.7
7.0
11.9
4.8
0.0
16.3
4.7
42.0
1989
0.8
1.0
10.1
7.2
50.9
1.1
0.0
0.5
25.1
1.2
0.8
1.3
1990
0.1
0.3
5.2
1.8
74.4
1.1
5.2
0.1
4.8
4.0
0.9
1.8
0.3
1991
1.2
0.5
94.1
0.4
0.6
0.9
1.0
0.1
0.4
0.8
1992
0.2
0.1
5.6
3.8
56.7
17.6
0.1
2.3
4.1
3.7
2.3
2.6
0.9
1993
0.3
2.2
11.4
54.9
16.0
0.3
0.6
5.2
4.3
0.9
0.0
3.8
0.1
1994
0.5
12.9
5.9
2.8
35.4
7.1
4.4
0.2
12.0
4.3
5.8
1.1
7.6
1995
0.5
0.3
5.0
2.2
8.4
8.0
0.7
18.3
20.4
18.8
2.2
0.2
15.0
1996
0.5
0.2
4.1
2.7
9.3
14.6
2.5
0.4
27.2
27.8
6.2
1.8
2.6
0.1
1997
0.2
0.2
10.1
0.8
45.8
5.0
1.1
3.4
5.3
8.2
4.3
0.8
0.6
14.2
1998
1.2
0.2
22.7
3.8
34.5
7.3
1.0
1.2
6.2
6.6
4.1
3.7
2.6
4.9
1999
0.2
0.1
25.8
6.3
26.5
9.8
2.5
0.7
10.3
5.0
0.4
1.4
0.5
10.5
2000
0.9
0.4
7.9
1.6
68.9
6.5
0.8
2.3
2.8
3.4
0.7
1.5
2.3
2001
0.7
0.2
4.4
4.6
71.7
4.4
1.6
2.5
3.3
2.6
0.3
1.9
0.4
1.4
2002
0.2
0.7
5.9
6.5
50.9
3.0
4.2
2.0
9.0
13.0
1.0
1.7
0.7
1.2
2003
0.1
0.2
5.5
4.9
59.1
10.6
1.5
1.1
4.3
9.1
0.5
1.4
0.4
1.3
2004
0.2
0.2
6.5
3.2
48.2
4.9
0.5
2.6
7.6
17.0
1.6
2.7
1.6
3.2
2005
0.3
0.3
5.8
4.2
33.2
2.9
0.8
5.6
7.9
31.2
1.5
2.5
3.8
2006
0.1
0.1
4.6
4.8
45.8
1.8
0.6
6.1
1.8
28.3
1.6
1.8
1.5
1.1
2007
0.5
0.2
8.3
5.0
29.2
18.4
1.9
7.8
20.8
2.0
2.3
2.7
0.9
2008
0.1
0.4
4.9
2.7
60.7
7.5
0.3
0.4
0.9
17.4
0.8
1.8
0.9
1.2
2009
0.2
0.3
5.5
4.2
53.0
8.6
0.8
0.4
4.1
12.9
1.5
2.9
3.9
1.7
2010
0.6
0.3
2.5
2.3
72.7
1.7
0.2
0.1
3.5
10.6
0.9
2.0
2.5
0.1
2011
0.1
0.3
3.1
2.9
82.0
0.4
0.6
2.6
5.2
0.9
0.5
1.1
0.3
2012
0.1
0.2
4.0
7.1
60.9
0.1
0.1
2.6
16.7
0.5
1.1
3.8
2.8
2013
0.3
0.7
4.1
7.6
67.9
0.2
0.4
0.6
5.1
8.3
0.9
1.4
1.8
0.7
2014
0.5
0.5
5.6
10.4
55.4
2.2
0.2
6.3
10.9
1.0
3.1
1.6
2.3
2015
0.2
0.1
4.1
6.7
69.9
1.1
1.1
2.9
6.8
2.1
1.3
2.4
1.3
2016
1.0
0.9
3.4
14.8
60.0
2.9
0.1
0.7
5.3
6.5
0.7
2.7
0.4
0.6
2017
0.1
0.6
2.9
4.2
74.2
1.4
1.5
0.6
10.7
1.3
1.2
1.0
0.3
2018
0.1
0.9
3.7
9.5
51.7
2.5
0.1
0.1
8.1
19.3
0.7
2.0
0.7
0.6
2019
0.4
0.5
3.8
6.6
68.4
2.8
0.1
0.2
5.5
7.4
1.0
0.5
1.9
0.9
2020
0.4
0.8
2.6
7.5
59.3
5.5
0.0
0.2
13.4
4.8
1.8
1.9
1.0
0.8
2021
0.4
1.1
5.2
9.3
51.0
10.6
3.9
0.1
3.6
8.1
2.3
2.8
1.6
2022
0.3
0.8
4.9
13.7
57.8
2.1
1.6
0.3
3.1
6.1
2.9
3.9
0.3
2.2
Table A5.18. Mean stomach content composition (% of total SFI) of cod ≥ 50 cm from the survey in the Barents Sea winter 1984-2022.
Age group
Total
Biomass(‘000 t)
Area
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
A
126.3
55.6
8.45
0.84
4.21
5.64
3.86
0.25
0.03
0.18
0.00
0.00
0.00
0.00
0.05
205.4
28.8
B
137.2
51.7
3.31
1.31
1.24
1.00
0.25
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
195.9
17.2
C
68.7
37.0
1.20
0.40
0.75
1.69
0.63
0.26
0.00
0.00
0.00
0.02
0.00
0.00
0.00
110.6
8.96
D
622.8
304.3
44.9
4.03
31.3
25.1
20.3
1.32
0.03
0.05
0.02
0.00
0.00
0.00
0.00
1054.2
148.2
D'
108.3
109.3
23.9
1.48
13.0
14.4
7.54
0.20
0.05
0.01
0.00
0.00
0.00
0.00
0.00
278.2
57.7
E
69.0
5.62
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
74.6
2.04
S
81.9
11.2
0.27
0.04
0.15
0.85
0.71
0.13
0.00
0.00
0.00
0.00
0.00
0.00
0.00
95.2
5.67
N
129.6
9.22
0.52
0.00
0.13
0.71
0.17
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.00
140.4
6.43
ABCD
955.0
448.6
57.8
6.58
37.5
33.4
25.1
1.82
0.06
0.23
0.02
0.02
0.00
0.00
0.05
1566.2
203.2
Sum
1343.8
583.9
82.5
8.10
50.8
49.3
33.5
2.17
0.11
0.24
0.02
0.02
0.00
0.00
0.05
2154.6
275.0
Table A 6.1. HADDOCK. Abundance indices (numbers in millions) for the main areas of the Barents Sea from acoustic survey winter 2023 estimated by StoX software.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
1994
887.82
187.96
348.73
626.65
121.38
8.55
0.70
0.33
0.61
0.48
1.46
0.16
0.00
0.00
0.00
2184.83
643.51
1995
1198.18
88.59
41.47
121.49
395.37
47.61
2.80
0.05
0.12
0.03
0.00
0.54
0.14
0.00
0.00
1896.39
508.78
1996
132.60
94.52
29.97
22.09
68.65
143.69
5.67
0.93
0.00
0.01
0.00
0.02
0.04
0.00
0.00
498.19
248.35
19971
508.87
26.51
57.27
22.22
15.47
56.13
62.77
4.68
0.07
0.00
0.00
0.01
0.05
0.06
0.00
754.11
201.67
19981
210.96
150.99
33.78
58.79
24.20
7.70
14.06
20.69
1.44
0.02
0.04
0.00
0.00
0.00
0.12
522.78
150.98
1999
653.40
30.11
83.67
21.64
22.10
6.17
1.55
3.88
2.72
0.03
0.00
0.02
0.00
0.00
0.00
825.29
107.86
2000
1063.01
404.77
36.39
75.53
14.01
12.61
1.57
0.53
2.01
0.69
0.17
0.13
0.02
0.00
0.00
1611.44
189.81
2001
753.01
266.12
233.45
40.20
41.38
2.20
1.61
0.15
0.09
0.14
0.28
0.09
0.09
0.00
0.02
1338.83
206.40
2002
1315.15
267.90
255.20
201.84
18.47
11.70
1.59
0.29
0.03
0.13
0.26
0.09
0.05
0.00
0.00
2072.70
298.25
2003
2743.74
362.35
203.68
184.57
136.04
12.26
6.01
0.26
0.14
0.26
0.34
0.09
0.07
0.00
0.00
3649.81
444.48
2004
528.97
466.54
151.01
101.85
107.82
57.68
7.61
1.15
0.29
0.04
0.05
0.05
0.04
0.08
0.00
1423.18
322.95
2005
2276.46
143.98
221.33
115.67
57.43
56.71
12.69
0.38
0.32
0.01
0.00
0.00
0.00
0.00
0.00
2884.98
305.99
20062
2091.11
624.78
56.32
123.84
47.37
19.26
13.64
3.23
0.08
0.15
0.00
0.03
0.00
0.00
0.09
2979.90
297.84
20071
2015.71
953.50
209.28
46.14
80.57
28.92
10.00
5.05
2.26
0.30
0.18
0.00
0.00
0.00
0.05
3351.97
401.72
2008
778.39
1753.54
812.41
303.04
90.02
74.12
7.41
12.77
1.63
0.14
0.16
0.18
0.00
0.00
0.00
3833.81
920.38
2009
443.93
209.05
883.68
629.98
266.65
38.87
14.57
1.26
0.34
0.66
0.00
0.05
0.00
0.00
0.00
2489.04
865.44
2010
1559.42
86.03
128.07
631.03
603.99
166.96
12.07
2.94
0.96
0.99
0.10
0.06
0.00
0.00
0.00
3192.62
1035.93
2011
428.46
288.27
54.16
84.23
313.02
292.21
54.91
1.71
0.96
0.23
0.00
0.20
0.07
0.00
0.00
1518.43
712.08
20123
1583.44
94.54
191.63
48.84
88.12
310.60
172.52
30.09
0.52
0.34
0.02
0.13
0.00
0.00
0.00
2520.79
814.60
2013
292.71
407.16
67.29
146.77
35.41
53.03
223.77
102.68
14.12
0.25
0.00
0.00
0.00
0.00
0.00
1343.19
759.62
2014
1838.71
109.92
334.82
39.12
108.72
23.18
34.77
86.36
36.63
1.66
0.52
0.00
0.00
0.01
0.00
2614.42
583.94
2015
1593.12
246.59
24.35
189.40
26.63
46.13
9.22
22.45
21.33
9.86
0.56
0.15
0.09
0.00
0.00
2189.88
387.71
2016
1276.00
107.18
71.81
12.08
59.62
12.52
17.28
7.48
17.21
12.74
2.76
0.48
0.00
0.03
0.02
1597.21
274.45
20173
3343.93
331.42
81.15
65.05
4.81
34.81
6.24
7.93
1.78
7.06
6.10
2.34
0.44
0.00
0.00
3893.06
338.87
2018
2925.90
810.16
171.03
62.74
64.40
6.77
15.57
2.75
2.57
1.56
5.56
2.99
1.87
0.14
0.00
4074.01
410.39
2019
1544.96
687.80
507.61
146.22
31.73
21.88
4.72
3.46
1.37
1.57
0.38
0.39
0.33
0.06
0.09
2952.57
396.54
20203
272.94
260.72
286.32
306.38
79.18
22.38
11.59
1.84
1.36
0.83
0.85
1.22
0.99
0.96
0.12
1247.68
381.58
20213
431.68
15.69
50.76
130.37
181.80
19.35
5.44
0.94
0.81
0.48
0.07
0.21
0.07
0.05
0.08
837.80
258.47
2022
1797.1
70.2
11.4
63.4
95.3
101.2
11.8
0.82
0.14
0.20
0.70
0.00
0.00
0.07
0.00
2152.2
282.60
2023
1032.7
511.1
77.0
9.02
51.3
53.3
38.1
2.69
0.13
0.28
0.01
0.02
0.00
0.00
0.05
1775.5
275.0
Table A 6.2. HADDOCK. Abundance indices (numbers in millions) from acoustic surveys in the Barents Sea winter 1994-2023 estimated by StoX software.
1 Indices raised to also represent the Russian EEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices raised to also represent uncovered parts of the Russian EEZ.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
2014
135.0
0.88
10.3
0.92
0.81
0.80
0.96
1.84
1.31
0.20
0.02
0
0
0
0
153.0
17.9
2015
71.2
22.2
0.71
17.9
1.10
6.77
0.90
1.31
4.01
3.03
0.14
0
0.09
0
0
129.4
48.2
2016
15.7
1.77
3.32
0.26
3.67
0.70
0.71
0.62
1.75
0.83
0.33
0
0
0
0
29.7
16.1
2017
80.1
8.20
1.23
2.28
0.40
2.60
0.40
0.92
0.29
0.64
0.61
0.33
0
0
0
98.0
18.1
2018
855.7
46.4
11.7
2.57
3.48
1.15
2.97
0.45
0.33
0.25
0.54
0.39
0.38
0
0
926.4
54.6
2019
67.68
25.50
16.12
5.59
1.07
1.01
0.13
0.11
0.05
0.03
0.03
0.09
0.03
0.05
0.00
118.11
17.84
2020
1.54
1.18
12.6
12.4
3.09
2.40
0.55
0.49
0.16
0.09
0.04
0.08
0.08
0.05
0
34.8
22.7
2021
5.47
0.44
0.23
4.87
7.44
0.73
0.28
0.14
0.08
0.01
0.05
0.02
0.05
0.00
0.00
19.8
13.4
2022
102.5
3.81
0.05
0.61
3.72
1.70
0.31
0.05
0.00
0.00
0.00
0.00
0.00
0.00
0.00
112.7
51.8
2023
129.6
9.22
0.52
0.00
0.13
0.71
0.17
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.00
140.4
6.43
Table A6.3. HADDOCK. Abundance indices (numbers in millions) for new strata 24-26 from acoustic surveys in the Barents Sea winter 2014-2023 estimated by StoX software. In 2020, the main index was revised to include these strata.
Age group
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
11
12
10
9
12
21
44
53
39
55
31
103
-
-
1995
16
22
24
15
10
15
34
128
85
114
-
55
90
-
1996
20
27
31
23
16
15
22
44
-
120
-
98
108
-
19971
12
17
14
16
16
12
14
33
53
-
-
121
63
74
19981
14
15
15
13
14
21
17
15
50
107
109
-
-
-
1999
19
24
21
28
22
23
32
34
26
118
-
123
-
-
2000
9
9
21
12
18
17
28
45
30
39
72
102
104
-
2001
17
16
16
25
16
30
35
65
66
96
62
94
86
-
2002
8
10
12
10
16
16
29
51
111
69
60
53
71
-
2003
11
11
11
9
15
25
38
80
106
90
76
102
107
-
2004
37
23
23
30
33
17
21
26
45
65
65
86
64
66
2005
10
16
11
15
12
16
19
59
76
104
-
-
-
-
20062
12
10
27
20
12
15
20
33
66
67
-
78
-
-
20071
9
7
9
12
12
15
21
29
40
52
88
-
-
-
2008
13
10
10
10
21
24
29
62
94
263
84
137
-
-
2009
14
13
9
11
14
19
19
43
79
48
-
107
-
-
2010
15
17
10
10
9
13
27
34
49
49
108
92
-
-
2011
15
13
16
12
11
10
15
40
58
94
-
84
115
-
20122
16
28
16
35
24
20
20
27
86
50
105
68
-
-
2013
14
13
22
11
22
16
13
15
26
59
-
-
-
-
2014
13
19
12
20
18
17
16
15
15
44
79
-
-
109
2015
14
17
24
13
23
21
27
23
20
55
64
65
-
-
2016
11
15
15
19
12
14
15
19
17
15
30
43
-
70
20172
6
9
15
13
22
16
22
23
34
29
24
36
67
-
2018
8
8
9
13
17
29
22
29
34
30
27
28
54
81
2019
9
8
8
8
13
14
29
26
48
35
64
35
72
115
20202
15
14
11
12
12
14
19
26
30
48
54
49
43
50
20212
15
25
19
34
45
21
37
48
78
94
61
121
57
87
2022
14
17
26
15
13
13
20
41
71
77
57
-
-
86
2023
11
12
15
19
16
15
17
30
77
113
116
117
-
-
Table A6.4. HADDOCK. Estimates of coefficients of variation (%) for acoustic abundance indices. Barents Sea winter 1994-2023.
1 Russian EEZ not covered. 2 Russian EEZ partly covered.
Age group
Total
Biomass(‘000 t)
Area
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
A
126.3
55.6
8.45
0.84
4.21
5.64
3.86
0.25
0.03
0.18
0.00
0.00
0.00
0.00
0.05
205.4
28.8
B
137.2
51.7
3.31
1.31
1.24
1.00
0.25
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
195.9
17.2
C
68.7
37.0
1.20
0.40
0.75
1.69
0.63
0.26
0.00
0.00
0.00
0.02
0.00
0.00
0.00
110.6
8.96
D
622.8
304.3
44.9
4.03
31.3
25.1
20.3
1.32
0.03
0.05
0.02
0.00
0.00
0.00
0.00
1054.2
148.2
D'
108.3
109.3
23.9
1.48
13.0
14.4
7.54
0.20
0.05
0.01
0.00
0.00
0.00
0.00
0.00
278.2
57.7
E
69.0
5.62
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
74.6
2.04
S
81.9
11.2
0.27
0.04
0.15
0.85
0.71
0.13
0.00
0.00
0.00
0.00
0.00
0.00
0.00
95.2
5.67
N
129.6
9.22
0.52
0.00
0.13
0.71
0.17
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.00
140.4
6.43
ABCD
955.0
448.6
57.8
6.58
37.5
33.4
25.1
1.82
0.06
0.23
0.02
0.02
0.00
0.00
0.05
1566.2
203.2
Sum
1343.8
583.9
82.5
8.10
50.8
49.3
33.5
2.17
0.11
0.24
0.02
0.02
0.00
0.00
0.05
2154.6
275.0
Table A6.5. HADDOCK. Abundance indices from bottom trawl hauls for main areas of the Barents Sea winter 2023 (numbers in millions). Bootstrap mean estimates.
Total
Biomass(‘000 t)4
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
1994
604.20
224.79
314.53
436.25
46.18
3.54
0.16
0.13
0.20
0.15
0.47
0.03
0.00
0.00
0.00
0.00
403.7
1995
1429.04
199.52
54.86
167.10
343.38
29.62
1.44
0.03
0.04
0.02
0.00
0.29
0.09
0.00
0.00
0.00
443.9
1996
300.78
265.08
55.84
31.33
150.77
238.11
16.13
1.15
0.00
0.01
0.00
0.03
0.03
0.00
0.00
0.00
431.9
19971
1117.83
90.81
79.63
39.86
18.25
61.57
88.41
3.28
0.08
0.00
0.00
0.00
0.03
0.02
0.00
0.00
273.3
19981
248.27
196.70
21.68
36.75
11.84
1.29
9.20
7.21
0.65
0.02
0.02
0.00
0.00
0.00
0.03
0.03
91.7
1999
1207.98
83.20
56.92
15.87
9.42
2.83
0.81
1.28
0.77
0.02
0.00
0.02
0.00
0.00
0.00
0.00
86.7
2000
832.30
437.22
24.08
35.24
6.79
4.13
0.68
0.08
0.80
0.22
0.03
0.03
0.01
0.00
0.00
0.00
124.1
2001
1230.98
446.84
294.00
26.25
23.00
1.63
0.75
0.06
0.06
0.05
0.16
0.09
0.02
0.00
0.00
0.01
227.7
2002
1700.19
475.31
312.87
185.45
12.42
8.04
0.85
0.22
0.01
0.09
0.16
0.04
0.04
0.00
0.00
0.00
308.4
2003
3327.32
471.68
352.24
174.45
72.71
5.10
1.68
0.12
0.10
0.10
0.10
0.01
0.01
0.00
0.00
0.00
411.5
2004
700.86
706.61
173.13
100.52
77.02
51.28
7.41
0.91
0.13
0.04
0.05
0.04
0.04
0.07
0.00
0.00
307.6
2005
4473.16
386.39
317.89
141.06
50.66
61.19
10.08
0.25
0.08
0.01
0.00
0.00
0.00
0.00
0.00
0.00
431.0
20062
4944.60
1310.22
78.80
130.76
46.05
20.87
16.21
3.18
0.09
0.15
0.00
0.05
0.00
0.00
0.04
0.03
454.2
20071
3731.19
1684.83
443.27
81.78
84.67
26.28
5.41
2.20
1.38
0.80
0.07
0.00
0.00
0.00
0.03
0.00
594.8
2008
853.09
2042.01
1591.03
583.61
53.08
54.73
6.79
10.25
0.23
0.05
0.08
0.05
0.00
0.00
0.00
0.00
1100.5
2009
562.61
317.05
1230.43
751.01
368.33
25.41
12.44
0.85
0.09
0.35
0.00
0.01
0.00
0.00
0.00
0.00
976.7
2010
1634.82
79.89
102.45
510.45
443.76
139.32
7.99
1.02
0.39
0.47
0.05
0.05
0.00
0.00
0.00
0.00
759.4
2011
676.31
353.87
52.88
123.63
469.48
290.04
65.24
1.42
1.12
0.00
0.00
0.15
0.03
0.00
0.00
0.00
827.5
20123
1866.96
137.38
316.08
28.79
74.71
267.94
154.60
24.77
3.11
0.28
0.04
0.08
0.00
0.00
0.00
0.00
740.3
2013
344.58
490.28
57.44
143.98
22.02
33.62
191.14
69.38
6.11
0.08
0.00
0.00
0.00
0.00
0.00
0.00
600.9
2014
1281.40
123.95
381.17
32.73
104.40
23.26
50.04
97.54
38.69
1.82
0.59
0.00
0.00
0.02
0.00
0.00
656.0
2015
1133.97
342.02
30.61
187.04
43.60
39.44
14.67
18.73
30.74
9.70
0.33
0.14
0.02
0.00
0.00
0.00
404.4
2016
2299.37
561.96
163.38
34.34
115.60
22.41
41.95
12.44
32.40
27.64
4.34
0.98
0.00
0.14
0.05
0.02
569.4
20173
5065.43
770.04
134.94
105.48
7.55
55.34
9.69
15.60
2.53
10.33
8.74
4.06
0.73
0.00
0.00
0.00
566.0
2018
3823.29
1675.64
336.31
86.66
65.76
7.77
15.59
3.62
2.56
1.70
4.72
4.00
1.38
0.13
0.00
0.00
574.8
2019
1898.20
1125.27
1075.55
187.22
49.40
17.00
4.04
2.95
0.74
1.08
0.19
0.35
0.20
0.05
0.00
0.02
600.0
20203
110.62
267.79
424.22
586.99
99.12
22.08
6.06
2.61
1.04
0.67
0.23
0.71
0.70
0.49
0.02
0.00
537.8
20213
406.30
25.12
109.80
175.26
262.62
19.19
3.65
0.71
0.20
0.13
0.08
0.31
0.18
0.05
0.03
1004
340.5
2022
1662.1
110.3
12.2
86.5
121.7
113.6
9.10
0.62
0.11
0.16
0.24
0.00
0.00
0.04
0.00
2116.7
316.7
2023
1343.8
583.9
82.5
8.10
50.8
49.3
33.5
2.17
0.11
0.24
0.02
0.02
0.00
0.00
0.05
2154.6
275.0
Table A6.6. HADDOCK. Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates.
1 Indices raised to also represent the Russian EEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices raised to also represent uncovered parts of the Russian EEZ.
4 1994-2020: for years with raising, estimated based on relationship between unraised numbers-at-age and biomass-at-age from StoX baseline run. From 2021: estimated based on relationship between unraised numbers-at-age and biomass-at-age bootstrap mean estimates from StoX.
Age group
Total
Biomass(‘000 t)
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15+
2014
128.7
1.26
12.3
0.65
2.22
0.12
3.38
1.16
0.74
0.07
0.0
0.0
0.0
0.0
0
150.6
20.9
2015
49.0
17.4
0.33
13.2
0.46
4.30
0.88
0.56
3.51
2.16
0.0
0.0
0.0
0.0
0
91.8
34.5
2016
42.6
4.50
10.2
0.51
9.69
2.45
1.43
2.41
4.80
3.13
0.36
0.0
0.0
0.0
0
82.0
45.7
2017
199.6
15.7
3.76
5.83
2.18
7.56
0.80
2.07
1.06
1.82
2.39
0.72
0.0
0.0
0
243.5
51.6
2018
1141.9
65.3
17.9
3.20
5.03
2.27
3.66
0.90
0.54
0.35
0.72
0.48
0.56
0.0
0
1242.8
77.9
2019
115.3
45.6
30.1
7.74
3.03
1.13
0.15
0.14
0.0
0.07
0.0
0.06
0.0
0.0
0.02
203.4
29.9
2020
3.61
3.93
35.1
33.1
8.11
7.89
1.93
1.05
0.54
0.28
0.13
0.25
0.27
0.11
0
96.3
63.2
2021
12.6
1.08
0.40
7.74
13.4
1.29
0.61
0.14
0.09
0.02
0.06
0.09
0.11
0.00
0.00
37.6
22.8
2022
79.3
2.86
0.04
0.32
3.00
0.59
0.09
0.03
0.00
0.00
0.00
0.00
0.00
0.00
0.00
86.2
6.81
2023
129.6
9.22
0.52
0.00
0.13
0.71
0.17
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.00
140.4
6.43
Table A6.7. HADDOCK. Abundance indices (numbers in millions) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023. 2014-2020: baseline estimates, from 2021: bootstrap mean estimates.
Age group
Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
11
13
15
13
15
29
52
45
33
52
38
97
-
-
1995
12
19
28
29
16
21
38
180
75
97
-
58
97
-
1996
14
13
12
25
30
24
61
64
-
98
-
95
96
-
19971
13
35
13
15
17
21
18
57
54
-
-
-
64
92
19981
15
13
13
14
16
25
18
16
34
107
106
-
-
-
1999
15
37
14
24
21
24
25
31
22
89
-
97
-
-
2000
9
9
18
9
16
14
34
51
31
34
63
91
105
-
2001
12
17
12
20
11
36
33
47
59
51
47
86
62
-
2002
9
11
10
10
22
17
27
39
81
60
48
51
75
-
2003
16
24
28
13
11
19
31
59
60
71
56
92
93
-
2004
9
12
15
16
10
13
28
24
43
56
58
93
60
54
2005
9
17
12
22
14
22
14
70
48
93
-
-
-
-
20062
14
14
18
12
13
16
21
30
44
70
-
63
-
-
20071
10
8
9
19
12
17
24
26
44
50
61
-
-
-
2008
12
17
15
13
19
30
27
81
42
81
68
88
-
-
2009
13
20
15
21
24
18
32
27
91
68
-
94
-
-
2010
10
17
18
22
18
18
25
29
42
55
144
167
-
-
2011
10
10
14
25
18
13
20
38
73
-
-
81
84
-
20122
19
28
17
16
15
13
15
33
73
48
83
61
-
-
2013
12
12
13
14
27
24
27
14
26
50
-
-
-
-
2014
7
26
12
22
16
22
20
14
24
40
55
-
-
99
2015
7
13
26
14
44
11
25
18
21
28
40
51
97
-
2016
22
25
13
42
11
15
20
15
15
19
27
51
-
62
20172
5
13
15
12
20
14
21
27
25
18
21
36
77
-
2018
7
16
13
12
10
17
15
23
18
18
18
20
32
52
2019
9
11
15
12
27
12
40
20
30
30
35
29
35
46
20202
16
9
11
14
14
19
22
29
27
40
39
29
24
37
20212
12
22
17
16
22
13
21
25
47
46
47
66
42
69
2022
10
12
27
17
23
18
19
25
52
66
49
-
-
65
2023
8
11
16
15
19
14
14
18
58
50
94
134
-
-
Table A6.8. HADDOCK. Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea winter 1994-2023.
1 Russian EEZ not covered.
2 Russian EEZ partly covered.
Year
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
Acoustic investigations
1994-95
2.30
1.51
1.05
0.46
0.94
1.12
2.64
1.01
1995-96
2.54
1.08
0.63
0.57
1.01
2.13
1.09
-
1996-97
1.61
0.50
0.30
0.35
0.20
0.83
0.19
2.60
1997-98
1.21
-0.24
-0.03
-0.09
0.70
1.38
1.11
1.18
1998-99
1.95
0.59
0.45
0.98
1.37
1.60
1.29
2.03
1999-00
0.48
-0.19
0.10
0.43
0.56
1.37
1.07
0.66
2000-01
1.38
0.55
-0.10
0.60
1.85
2.06
2.28
1.77
2001-02
1.03
0.04
0.15
0.78
1.26
0.32
1.71
1.67
2002-03
1.29
0.27
0.32
0.39
0.41
0.67
1.81
0.73
2003-04
1.77
0.88
0.69
0.54
0.86
0.48
1.65
-0.11
2004-05
1.30
0.75
0.27
0.57
0.64
1.51
3.00
1.28
2005-06
1.29
0.94
0.58
0.89
1.09
1.43
1.37
1.56
2006-07
0.79
1.09
0.20
0.43
0.49
0.66
0.99
0.36
2007-08
0.14
0.16
-0.37
-0.67
0.08
1.36
-0.25
1.13
2008-09
1.31
0.69
0.25
0.13
0.84
1.62
1.77
3.63
2009-10
1.64
0.49
0.34
0.04
0.47
1.17
1.60
0.27
2010-11
1.69
0.46
0.42
0.70
0.73
1.11
1.95
1.12
2011-12
1.51
0.41
0.10
-0.05
0.01
0.53
0.60
1.20
2012-13
1.36
0.34
0.27
0.32
0.51
0.33
0.52
0.76
2013-14
0.98
0.20
0.54
0.30
0.42
0.42
0.95
1.03
2014-15
2.01
1.51
0.57
0.39
0.86
0.92
0.44
1.40
2015-16
2.70
1.23
0.70
1.16
0.76
0.98
0.21
0.26
2016-17
1.35
0.28
0.10
0.92
0.54
0.69
0.78
1.43
2017-18
1.42
0.67
0.25
0.01
-0.36
0.79
0.82
1.13
2018-19
1.45
0.46
0.15
0.68
1.08
0.34
1.57
0.70
2019-20
1.78
0.88
0.50
0.61
0.35
0.64
0.98
0.88
2020-21
2.86
1.64
0.79
0.52
1.41
1.41
2.51
0.82
2021-22
1.82
0.32
-0.22
0.31
0.59
0.49
1.89
1.90
2022-23
1.26
-0.09
0.23
0.21
0.58
0.98
1.48
1.84
Bottom trawl investigations
1994-95
1.11
1.41
0.63
0.24
0.44
0.90
1.87
1.10
1995-96
1.68
1.27
0.56
0.10
0.37
0.61
0.23
-
1996-97
1.20
1.20
0.34
0.54
0.90
0.99
1.59
2.64
1997-98
1.74
1.43
0.77
1.21
2.65
1.90
2.51
1.62
1998-99
1.09
1.24
0.31
1.36
1.43
0.47
1.97
2.24
1999-00
1.02
1.24
0.48
0.85
0.82
1.42
2.27
0.47
2000-01
0.62
0.40
-0.09
0.43
1.42
1.70
2.47
0.33
2001-02
0.95
0.36
0.46
0.75
1.05
0.66
1.24
1.84
2002-03
1.28
0.30
0.58
0.94
0.89
1.56
1.96
0.74
2003-04
1.55
1.00
1.25
0.82
0.35
-0.37
0.61
-0.11
2004-05
0.60
0.80
0.20
0.69
0.23
1.63
3.39
2.43
2005-06
1.23
1.59
0.89
1.12
0.89
1.33
1.15
0.97
2006-07
1.08
1.08
-0.04
0.43
0.56
1.35
2.00
0.84
2007-08
0.60
0.06
-0.28
0.43
0.44
1.35
-0.64
2.25
2008-09
0.99
0.51
0.75
0.46
0.74
1.48
2.08
4.73
2009-10
1.95
1.13
0.88
0.53
0.97
1.16
2.50
0.79
2010-11
1.53
0.41
-0.19
0.08
0.43
0.76
1.73
-0.10
2011-12
1.59
0.11
0.61
0.50
0.56
0.63
0.97
-0.79
2012-13
1.34
0.87
0.79
0.27
0.80
0.34
0.80
1.40
2013-14
1.02
0.25
0.56
0.32
-0.05
-0.40
0.67
0.58
2014-15
1.32
1.40
0.71
-0.29
0.97
0.46
0.98
1.15
2015-16
0.70
0.74
-0.11
0.48
0.67
-0.06
0.17
-0.55
2016-17
1.09
1.43
0.44
1.51
0.74
0.84
0.99
1.59
2017-18
1.11
0.83
0.44
0.47
-0.03
1.27
0.98
1.81
2018-19
1.22
0.44
0.59
0.56
1.35
0.65
1.67
1.59
2019-20
1.96
0.98
0.61
0.64
0.81
1.03
0.44
1.04
2020-21
1.49
0.88
0.88
0.79
1.64
1.82
2.19
2.62
2021-22
1.30
0.72
0.25
0.37
0.85
0.75
1.75
1.82
2022-23
1.05
0.29
0.41
0.53
0.90
1.22
1.43
1.73
Table A6.9. HADDOCK. Survey mortality from surveys in the Barents Sea winter 1994-2023.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
14.5
19.9
29.3
38.1
47.8
54.0
61.0
64.3
70.4
64.8
64.1
+
-
-
1995
15.1
18.2
28.6
34.0
42.8
51.3
58.9
+
+
+
-
+
+
-
1996
15.3
20.8
28.0
36.9
41.2
47.2
55.0
59.9
-
+
-
+
+
-
1997
15.7
19.7
27.4
34.1
39.5
47.3
50.7
55.0
62.8
-
-
-
+
+
1998
14.5
22.5
29.3
37.3
43.1
48.4
52.1
53.3
58.2
+
+
-
-
-
1999
14.4
18.3
32.3
38.8
46.5
51.9
56.0
55.2
58.8
+
-
+
-
-
2000
15.5
21.6
29.9
42.0
47.0
51.1
53.4
59.1
59.3
62.0
+
+
+
-
2001
14.6
22.1
32.1
37.6
48.0
50.4
59.1
56.2
64.6
66.5
68.2
+
+
-
2002
15.1
20.8
29.1
39.8
45.2
51.7
57.8
60.7
+
+
64.6
68.0
+
-
2003
15.8
23.9
26.4
36.6
45.8
49.7
54.8
60.9
63.9
61.6
67.3
+
+
-
2004
14.2
22.1
30.1
35.7
42.8
49.8
49.8
59.0
63.0
73.5
75.9
+
+
74.1
2005
14.8
20.5
29.9
36.1
40.5
48.3
51.6
55.7
60.8
+
-
-
-
-
2006
14.5
22.0
30.7
37.9
43.3
47.3
50.7
56.7
60.4
+
-
+
-
-
2007
15.5
22.9
29.0
35.7
45.8
48.0
53.5
57.4
57.3
68.7
+
-
-
-
2008
15.7
23.8
29.6
37.8
42.8
46.5
53.1
53.8
59.5
+
+
+
-
-
2009
14.3
22.3
29.7
35.5
41.7
48.1
49.7
56.5
+
62.8
-
+
-
-
2010
14.4
19.9
30.8
36.9
41.1
45.3
49.7
58.9
59.4
62.0
+
+
-
-
2011
13.6
23.2
28.5
39.4
42.9
46.1
48.3
62.5
53.8
-
-
+
+
-
2012
14.7
19.3
31.6
35.1
43.6
47.1
50.1
51.2
53.4
65.3
+
71.7
-
-
2013
14.5
22.9
30.0
40.9
42.8
48.7
52.2
52.9
55.7
67.3
-
-
-
-
2014
15.4
18.5
31.9
38.4
46.4
52.4
53.6
55.3
55.2
61.0
58.9
-
-
+
2015
14.5
20.4
26.2
39.8
45.7
52.5
53.6
57.5
57.0
59.9
59.9
67.3
+
-
2016
14.9
18.4
30.9
36.8
47.8
53.1
56.0
58.6
61.1
60.4
60.1
63.6
-
+
2017
15.8
20.5
30.5
40.0
49.6
52.9
56.1
60.6
61.2
63.2
62.5
64.7
67.3
-
2018
14.5
21.7
30.4
39.6
47.8
54.4
58.0
61.3
64.2
65.6
64.6
63.9
66.5
68.9
2019
14.8
21.5
29.7
37.1
46.1
52.5
53.6
60.5
64.3
65.7
67.5
67.3
69.5
69.3
2020
15.4
21.9
30.0
36.3
42.7
52.1
57.4
62.2
63.7
68.1
69.7
67.4
69.0
70.3
2021
14.4
19.5
29.1
36.2
42.7
49.2
55.0
60.5
66.7
69.4
73.0
71.6
71.7
+
2022
14.1
20.2
31.2
37.4
42.6
47.1
51.6
61.4
65.0
68.5
69.0
-
-
+
2023
15.0
22.4
27.9
40.5
44.5
48.1
51.0
55.1
65.0
64.0
+
+
-
-
Table A6.10. HADDOCK. Mean length (cm) at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates. “+” indicates few samples (< 3), while “–“ indicates no samples. Lengths are not adjusted for incomplete coverage.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
25
85
244
539
1060
1599
2146
2719
3349
2722
2662
+
-
-
1995
30
69
219
382
775
1357
1954
+
+
+
-
2537
+
-
1996
32
92
218
473
669
1022
1627
1948
-
+
-
+
3626
-
1997
35
82
193
381
616
1051
1300
1680
2476
-
-
-
+
+
1998
27
113
247
543
863
1166
1417
1583
2046
+
+
-
-
-
1999
28
77
334
580
1020
1445
1775
1730
2020
+
-
+
-
-
2000
33
109
275
736
1050
1367
1586
2093
2219
2575
+
+
+
-
2001
28
106
337
582
1146
1422
2140
2029
2939
3139
3105
+
+
-
2002
30
85
244
621
923
1388
1927
2242
+
+
2692
3280
+
-
2003
36
128
192
492
959
1204
1534
1982
2580
2675
3179
+
+
-
2004
23
98
271
458
752
1162
1222
1978
2611
3875
4186
+
+
4036
2005
29
97
263
471
669
1087
1376
1881
2120
+
-
-
-
-
2006
26
109
301
559
812
1086
1362
1925
2075
+
-
+
-
-
2007
32
109
253
519
1016
1193
1718
2043
2258
3443
+
-
-
-
2008
32
114
247
551
835
1115
1573
1599
2167
+
+
+
-
-
2009
26
94
227
444
746
1147
1315
1732
+
2567
-
+
-
-
2010
28
87
275
473
677
957
1261
1889
2204
2492
+
+
-
-
2011
21
117
220
520
729
943
1171
2264
1641
-
-
+
+
-
2012
29
75
306
432
819
1015
1280
1313
1700
2693
+
3287
-
-
2013
25
114
272
645
782
1138
1351
1502
1850
3117
-
-
-
-
2014
32
68
352
589
1002
1428
1566
1674
1704
2212
2156
-
-
+
2015
23
88
200
590
885
1418
1501
1915
1848
2085
2298
3148
+
-
2016
27
74
285
495
1058
1466
1754
2089
2290
2263
2402
2716
-
+
2017
33
95
293
637
1247
1542
1822
2294
2420
2640
2633
2890
3241
-
2018
26
95
275
627
1051
1663
1967
2349
2699
2820
2681
2648
3011
3415
2019
25
90
242
510
968
1411
1618
2083
2722
2916
3072
3220
3475
3229
2020
27
89
244
458
806
1385
1863
2426
2658
2887
3334
3013
3366
3600
2021
27
86
208
447
735
1159
1591
2201
3156
3172
3835
3533
3771
+
2022
24
96
292
478
731
1027
1386
2316
2774
3052
3357
-
-
+
2023
28
107
225
656
849
1134
1385
1855
2930
2660
+
+
-
-
Table A6.11. HADDOCK. Mean weight (g) at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates. “+” indicates few samples (< 3), while “–“ indicates no samples. Weights are not adjusted for incomplete coverage.
Year\Age
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
9-10
1994-95
44
134
137
235
297
355
-
-
-
1995-96
61
148
253
287
247
270
-5
-
-
1996-97
50
101
164
143
382
278
53
528
-
1997-98
78
165
349
481
550
366
283
366
-
1998-99
50
221
333
478
582
609
313
437
-
1999-00
81
198
403
470
347
141
318
489
554
2000-01
74
227
308
409
372
773
444
846
920
2001-02
57
138
285
341
242
505
102
-
-
2002-03
98
106
248
338
281
146
54
338
-
2003-04
62
143
267
261
203
18
444
629
1295
2004-05
74
165
200
210
335
214
660
142
-
2005-06
80
204
296
341
417
275
550
194
-
2006-07
84
144
218
457
381
632
681
333
1368
2007-08
82
138
298
316
99
380
-119
124
-
2008-09
62
113
197
196
311
199
160
-
400
2009-10
61
181
246
233
211
115
574
472
-
2010-11
89
133
245
256
266
214
1003
-248
-
2011-12
53
189
212
299
285
337
142
-565
1052
2012-13
85
197
339
349
319
336
221
537
1418
2013-14
43
238
317
357
646
428
323
202
362
2014-15
56
132
238
296
416
73
348
175
381
2015-16
51
197
295
468
580
337
588
375
414
2016-17
68
219
352
753
483
356
540
331
350
2017-18
61
180
334
414
416
426
527
405
400
2018-19
64
148
235
341
361
-45
116
373
217
2019-20
64
155
216
296
417
452
808
575
165
2020-21
58
120
202
278
350
199
337
733
519
2021-22
69
206
270
284
292
227
725
573
-104
2022-23
83
129
364
371
403
358
469
614
-114
Table A6.12. HADDOCK. Yearly weight increment (g) from bottom trawl surveys in the Barents Sea winter 1994-2023.
Age/ Year
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1994
0.00
0.00
0.00
0.02
0.16
0.41
0.44
1.00
0.88
0.74
0.74
+
-
-
1995
0.00
0.00
0.01
0.04
0.18
0.38
0.41
+
+
+
-
0.63
+
-
1996
0.00
0.00
0.00
0.04
0.08
0.27
0.40
0.78
-
+
-
+
0.00
-
1997
0.00
0.00
0.00
0.00
0.15
0.33
0.64
0.31
0.70
-
-
-
+
+
1998
0.02
0.00
0.00
0.04
0.15
0.54
0.50
0.79
0.95
+
+
-
-
-
1999
0.00
0.00
0.00
0.06
0.24
0.38
0.77
0.81
0.98
+
-
+
-
-
2000
0.00
0.00
0.00
0.24
0.54
0.66
0.82
1.00
0.90
0.86
+
+
+
-
2001
0.00
0.00
0.00
0.22
0.54
0.49
0.89
1.00
1.00
0.70
1.00
+
+
-
2002
0.00
0.00
0.01
0.12
0.45
0.60
0.95
0.90
+
+
0.79
1.00
+
-
2003
0.00
0.00
0.00
0.04
0.40
0.59
0.73
0.60
0.64
0.68
1.00
+
+
-
2004
0.00
0.00
0.02
0.03
0.14
0.61
0.56
0.46
0.87
1.00
1.00
+
+
1.00
2005
0.00
0.00
0.01
0.06
0.19
0.43
0.76
0.34
1.00
+
-
-
-
-
2006
0.00
0.00
0.00
0.12
0.41
0.59
0.84
0.86
0.50
+
-
+
-
-
2007
0.00
0.00
0.01
0.19
0.46
0.67
0.82
0.95
0.84
1.00
+
-
-
-
2008
0.13
0.02
0.02
0.09
0.47
0.66
0.83
0.84
0.99
+
+
+
-
-
2009
0.00
0.00
0.00
0.04
0.16
0.29
0.64
0.65
+
0.41
-
+
-
-
2010
0.00
0.00
0.05
0.08
0.20
0.41
0.60
0.75
0.91
0.89
+
+
-
-
2011
-
0.00
0.00
0.07
0.14
0.41
0.38
0.38
0.79
-
-
+
+
-
2012
0.00
0.00
0.01
0.06
0.38
0.51
0.61
0.71
0.26
1.00
+
0.68
-
-
2013
0.00
0.00
0.01
0.04
0.17
0.49
0.61
0.62
0.63
1.00
-
-
-
-
2014
0.00
0.01
0.02
0.13
0.28
0.73
0.73
0.71
0.76
0.94
0.95
-
-
+
2015
0.00
0.00
0.03
0.05
0.15
0.44
0.64
0.67
0.39
0.54
1.00
0.68
+
-
2016
0.00
0.00
0.00
0.02
0.32
0.70
0.83
0.82
0.89
0.83
0.94
1.00
-
+
2017
0.00
0.00
0.01
0.15
0.32
0.63
0.74
0.95
0.93
0.97
0.98
1.00
1.00
-
2018
0.00
0.00
0.01
0.12
0.31
0.55
0.87
0.76
0.93
0.84
0.86
0.93
0.94
1.00
2019
0.00
0.00
0.02
0.08
0.18
0.59
0.66
0.83
0.92
0.97
1.00
1.00
1.00
1.00
2020
0.00
0.00
0.01
0.04
0.18
0.56
0.75
0.82
0.91
0.89
0.98
1.00
0.89
0.93
2021
0.00
0.00
0.00
0.06
0.14
0.47
0.64
0.73
0.81
1.00
1.00
0.79
0.88
+
2022
0.00
0.00
0.08
0.05
0.18
0.50
0.79
0.66
0.51
0.49
0.84
-
-
+
2023
0.00
0.00
0.02
0.40
0.38
0.71
0.84
0.95
1.00
1.00
+
+
-
-
Table A6.13. HADDOCK. Proportion mature at age from bottom trawl surveys in the Barents Sea winter 1994-2023. Bootstrap mean estimates. The proportion mature is the number of fish classified as maturity category 2 and 3, divided by the total number of fish assigned categories 1-5. “+” indicates few samples (< 3), while “–“ indicates no samples.
Length group (cm)
Total
Biomass (tons)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
>60
1994
675
7493
10100
12840
10914
17834
10065
4799
1645
937
202
121
77623
31841
1995
387
4658
13515
13118
10398
15429
16223
10587
3112
852
455
148
88883
42042
1996
40
715
3285
5950
8701
13991
15681
7479
2689
893
162
165
59750
35171
19971
0
316
967
2248
5084
20332
28015
8496
1845
1118
255
97
68773
43539
19981
63
2375
1307
2610
4505
7402
7485
5075
1556
469
147
0
32994
19345
1999
181
928
2070
4002
4351
6273
6143
5474
2643
738
75
0
32877
20699
2000
533
1097
1495
4185
4875
5108
3564
1869
612
464
89
0
23890
10541
2001
55
411
397
2451
5835
5442
4550
3232
1211
342
96
37
24058
14060
2002
130
1042
2021
1833
3946
4229
3237
3468
1627
598
192
27
22349
13053
2003
0
477
1300
1534
4180
4070
2764
3203
1996
548
123
327
20523
13357
2004
700
193
417
962
2853
4356
5415
3854
2279
562
140
45
21777
15779
2005
0
119
203
360
1106
2088
3846
4663
2730
1276
299
128
16818
16458
20062
0
0
0
178
2495
5534
6307
4155
3179
950
124
12
22934
18757
20071
0
58
295
96
529
1281
2739
4408
2848
1203
210
58
13724
14801
2008
1741
2527
201
171
436
706
1966
2546
3049
1231
157
19
14748
12666
2009
0
0
86
0
38
435
1737
3767
4184
1954
267
217
12685
17220
2010
367
1992
1146
522
136
82
855
1083
2072
1595
204
127
10181
9803
2011
341
3200
2103
285
398
125
274
2329
3030
1911
131
243
14370
13255
20123
805
4375
3995
1835
550
316
881
3645
4083
1775
320
85
22664
15887
2013
74
7428
4946
3961
1559
377
876
819
1280
1592
383
450
23744
11457
2014
123
1028
1454
3019
3317
1010
501
1427
2135
1172
629
191
16006
12004
2015
139
881
1467
3019
2602
2005
458
700
1216
1211
873
82
14653
10102
2016
698
1251
1454
2296
4159
3609
3362
1653
2147
2302
1114
250
24295
19696
20173
341
1304
898
1065
4462
9060
6661
2980
2087
1776
604
498
31735
25264
2018
1129
2750
1799
1678
3282
4693
6335
4261
2012
1630
715
299
30582
22806
2019
671
3248
1700
1818
2515
3910
9024
9693
6709
1544
477
415
41724
36612
20203
971
650
1498
1041
1891
2424
6450
8786
6426
2773
503
151
33564
33062
20213
43
303
872
1172
1093
1523
4090
5938
5323
2753
1190
239
24539
29383
2022
1806
1948
616
1472
1986
2590
7969
10624
6853
2498
720
187
39268
39084
2023
472
1886
573
1757
1501
1503
2357
4044
4943
2523
109
89
21756
21362
Table A7.1. GOLDEN REDFISH (Sebastes norvegicus) . Abundance indices (numbers in thousands) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
1 Indices raised to also represent the Russian EEZ
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices not raised to also represent uncovered parts of the Russian EEZ.
Length group (cm)
Total
Biomass1000’ (tons)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
≥45
2014
35
333
358
1440
2594
1315
211
501
379
7166
2913
2015
0
202
197
127
804
804
363
0
154
2651
1261
2016
0
0
103
300
597
1186
828
107
32
3151
1405
2017
0
66
93
587
519
679
547
96
66
2654
1053
2018
58
824
750
647
639
964
1855
546
50
6331
2598
2019
76
974
1445
567
666
1445
1043
519
102
6838
2525
2020
37
277
1239
934
1315
2498
2027
993
375
9695
4850
2021
25
305
1051
1173
437
893
857
389
126
5256
2004
2022
25
167
322
1127
1233
357
366
50
47
3694
1109
2023
0
193
193
869
1283
943
156
62
0
3700
1092
Table A7.2. GOLDEN REDFISH (Sebastes norvegicus). Abundance indices (numbers in thousands) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023.
Length group (cm)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
1994
49
38
23
29
21
37
20
34
15
18
35
1995
46
41
34
29
19
34
31
33
24
25
42
1996
73
51
48
27
18
29
27
22
17
24
46
19971
-
39
26
24
19
60
66
34
16
20
35
19981
53
30
27
27
24
38
44
42
24
27
44
1999
63
41
37
38
35
27
36
58
56
26
58
2000
35
28
19
24
22
28
30
29
20
23
58
2001
56
32
25
26
33
31
40
52
28
27
43
2002
56
61
52
24
27
22
25
33
37
25
41
2003
-
28
34
34
24
23
14
19
26
38
76
2004
72
38
30
28
33
55
53
26
23
26
50
2005
-
73
48
36
20
26
29
17
19
26
65
20062
-
-
-
53
48
42
32
29
22
20
43
20071
-
70
61
57
29
22
24
24
22
20
34
2008
33
27
39
63
38
23
21
25
19
25
49
2009
-
-
69
-
67
31
31
25
25
22
37
2010
57
27
46
48
41
54
32
29
18
20
35
2011
43
40
24
45
31
49
39
67
43
38
50
20123
35
42
23
22
37
39
24
42
46
31
39
2013
57
43
23
17
23
46
42
39
32
23
42
2014
53
32
28
17
20
38
37
37
27
24
24
2015
66
39
32
30
19
19
23
38
26
22
33
2016
49
31
19
18
24
18
18
28
22
21
31
20173
98
42
41
27
29
61
33
32
27
35
29
2018
33
21
17
20
19
17
22
17
21
21
25
2019
39
26
18
-
18
18
20
31
32
19
34
20203
84
26
24
22
22
32
31
45
33
29
43
20213
70
28
18
17
21
30
37
40
42
35
37
2022
43
62
28
18
25
44
49
61
47
56
41
2023
53
29
30
24
23
20
22
43
33
18
44
Table A7.3. GOLDEN REDFISH (Sebastes norvegicus). Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea standard area winter 1994-2023.
1 Russian EEZ not covered.
2 Russian EEZ partly covered.
3 Indices not raised to represent uncovered parts of the Russian EEZ.
Length group (cm)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
≥45
Total
Biomass (‘000 t)
1994
8
296
479
488
74
74
17
3
0
1440
161
1995
310
84
571
390
83
58
24
3
0
1522
152
1996
215
101
198
343
136
42
17
1
0
1053
128
19972
38
83
19
198
266
82
39
3
0
728
166
19982
1
87
62
101
202
40
13
2
0
507
96
1999
2
7
70
37
172
73
22
3
0
386
102
2000
9
13
40
78
143
97
27
7
1
415
113
2001
10
23
7
57
79
75
10
1
0
260
65
2002
17
7
19
36
96
116
24
1
0
317
90
2003
4
4
10
13
70
198
46
6
0
351
138
2004
2
3
7
19
33
86
32
2
0
183
68
2005
0
6
7
11
28
154
86
4
0
296
131
20063
100
2
10
15
23
104
83
3
1
339
108
20072
382
121
3
7
12
121
121
7
0
773
136
2008
858
359
27
5
12
104
165
5
0
1533
169
2009
95
325
136
5
9
67
163
6
0
806
156
2010
652
276
215
64
7
74
191
6
0
1485
190
2011
501
230
212
149
14
47
157
5
0
1315
177
20124
129
280
86
125
47
14
154
18
0
855
173
2013
249
227
245
159
143
35
193
27
0
1279
247
2014
91
174
250
114
125
51
115
14
0
933
171
2015
175
110
215
302
290
215
171
18
0
1495
343
2016
615
105
149
332
213
163
124
14
0
1714
264
20175
568
185
68
197
286
310
231
11
0
1855
412
2018
189
250
83
109
192
270
214
22
1
1329
350
2019
42
288
263
92
158
255
211
20
0
1330
339
20204
196
122
207
92
118
231
209
25
1
1200
313
20214
887
132
142
124
81
186
172
23
1
1749
277
2022
616
981
54
112
76
87
152
20
0
2098
224
2023
47
1091
335
94
149
131
194
31
1
2072
307
Table A7.4. BEAKED REDFISH (Sebastes mentella)1. Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
1 Includes unidentified Sebastes specimens, mostly less than 10cm .
2 Indices raised to also represent the Russian EEZ.
3 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
4 Indices not raised to represent uncovered parts of the Russian EEZ.
5 Indices raised to also represent uncovered parts of the Russian EEZ.
Length group (cm)
Biomass
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
>45
Total
(‘000 t)
2014
19.6
9.2
11.5
6.8
5.4
1.7
2.3
0.4
0
56.9
5.5
2015
13.5
5.5
8.3
11.3
11.4
5.2
3.4
0.1
0.03
58.9
9.4
2016
54.6
3.1
2.2
4.5
4.8
4.2
1.4
0.3
0
75.0
4.5
2017
81.9
13.1
1.3
4.5
6.0
6.4
3.6
0.6
0.03
117.4
7.8
2018
47.9
74.0
2.3
1.8
4.6
5.9
5.8
0.6
0
143.0
8.6
2019
10.9
10.1
7.0
0.7
1.4
1.3
2.1
0.2
0.03
33.7
3.0
2020
12.8
3.1
4.5
1.7
2.0
7.3
4.9
0.6
0.04
36.8
7.9
2021
136.1
1.0
4.3
6.0
3.2
15.2
9.4
0.5
0.05
175.7
14.5
2022
110.2
53.2
1.3
4.3
2.0
5.6
6.8
0.4
0
183.7
9.7
2023
6.6
157.0
30.4
2.3
2.6
1.7
3.0
0.5
0
203
9.7
Table A7.5. BEAKED REDFISH (Sebastes mentella)1. Abundance indices (numbers in millions) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023.
1 Includes unidentified Sebastes specimens, mostly less than 10cm.
Length group (cm)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
≥45
1994
36
14
29
34
27
24
28
49
59
1995
17
26
23
22
16
17
23
33
37
1996
17
22
28
19
16
33
24
38
63
19972
20
19
18
15
16
18
24
60
95
19982
33
16
20
14
19
18
23
32
71
1999
20
17
15
13
20
23
27
53
71
2000
15
12
15
14
16
22
31
69
85
2001
15
14
15
13
14
18
16
25
69
2002
53
13
13
19
17
20
17
25
67
2003
54
15
17
17
17
28
29
46
90
2004
19
16
15
19
14
14
18
19
56
2005
-
25
18
16
17
19
22
38
42
20063
13
50
26
30
19
19
17
21
79
20072
15
24
18
15
15
23
18
40
60
2008
12
15
25
17
16
21
20
25
45
2009
12
10
16
21
36
31
25
22
51
2010
14
11
10
14
20
33
32
20
88
2011
12
11
11
15
19
34
26
23
58
20124
15
12
14
15
19
29
37
56
45
2013
20
18
34
20
26
29
28
29
51
2014
10
11
11
12
17
19
28
24
51
2015
13
12
12
16
24
22
19
32
43
2016
10
10
14
22
18
16
19
18
60
20175
9
13
15
14
14
15
16
17
81
2018
10
11
12
14
11
13
17
23
33
2019
11
12
15
12
16
18
19
21
59
20204
11
14
11
11
15
13
12
17
49
20214
13
32
11
15
18
24
19
19
49
2022
15
23
14
13
13
12
14
18
61
2023
12
19
22
17
15
16
14
14
54
Table A7.6. BEAKED REDFISH (Sebastes mentella)1. Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea standard area winter 1994-2023.
1 Includes unidentified Sebastes specimens, mostly less than 10cm.
2 REZ not covered.
3 REZ partly covered.
Length group (cm)
Total
Year
5-9
10-14
15-19
20-24
25-29
≥30
1994
75355
94809
17218
12818
1377
279
201857
1995
10716
68713
22737
9349
3306
503
115325
1996
439
45796
43673
35921
5498
87
131415
19971
898
24202
28857
18768
4397
0
77122
19981
703
9385
42183
20801
2939
91
76102
1999
1577
10134
11675
2921
707
35
27049
2000
953
4904
37128
21976
2086
133
67179
2001
249
2243
30082
34425
3802
120
70921
2002
311
3223
17485
15028
1265
84
37395
2003
234
4306
22603
31019
4277
167
62605
2004
102
1793
24461
32768
3294
291
62709
2005
172
1582
16443
37359
6153
356
62066
20062
819
4480
3653
10381
2244
205
21782
20071
704
5238
15652
34395
2448
80
58517
2008
0
1820
5906
21010
4557
29
33322
2009
506
528
3096
11032
3405
419
18987
2010
1704
454
10134
53180
7571
22
73065
2011
533
1250
2168
7757
2197
106
14011
20121
586
3950
4080
29157
6212
74
44059
2013
1210
9521
3300
23464
8544
100
46139
2014
11388
17753
21079
64094
15135
1991
131439
2015
7353
27428
30881
65883
9178
115
140839
2016
2795
26824
18396
29229
11286
934
89464
20171
3848
58422
21556
22580
5685
426
112518
2018
787
24370
61427
37470
26220
1344
151617
2019
730
14679
58705
31991
6469
1250
113824
20201
603
3485
58704
46850
15290
907
125840
20211
1205
8858
82510
74590
19302
677
187141
2022
2001
2858
38592
52312
1914
300
98336
2023
11065
14438
20374
38170
24461
682
109191
Table A7.7. NORWAY REDFISH (Sebastes viviparus) . Abundance indices (numbers in thousands) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
1 Indices not raised to represent the REZ or uncovered parts, Sebastes viviparus is mainly found in NEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
Length group (cm)
Total
Year
5-9
10-14
15-19
20-24
25-29
≥30
2014
0
87
44
0
0
0
131
2015
0
0
35
0
0
0
35
2016
0
0
111
0
0
0
111
2017
0
0
0
0
0
0
0
2018
0
0
160
126
32
0
318
2019
0
0
51
0
0
0
51
2020
0
0
54
54
0
0
108
2021
51
0
0
74
0
0
125
2022
0
75
29
27
0
0
131
2023
0
31
27
0
27
0
85
Table A7.8. NORWAY REDFISH (Sebastes viviparus). Abundance indices (numbers in thousands) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023.
Length group (cm)
Year
5-9
10-14
15-19
20-24
25-29
30-34
1994
41
55
28
40
43
67
1995
49
36
48
39
78
98
1996
67
23
31
36
47
65
19971
83
37
32
53
59
-
19981
41
25
46
73
78
78
1999
80
59
33
24
36
65
2000
54
32
45
44
38
55
2001
39
26
31
29
34
90
2002
62
38
20
24
40
85
2003
71
35
36
32
28
75
2004
53
38
36
33
25
69
2005
63
33
38
31
34
67
20062
73
72
21
27
25
59
20071
71
76
34
36
31
87
2008
-
53
30
30
41
74
2009
67
48
26
27
30
63
2010
47
37
48
53
57
98
2011
51
51
45
39
42
74
20122
44
28
41
41
39
99
2013
57
31
24
41
48
101
2014
40
34
39
39
43
78
2015
35
27
30
42
43
71
2016
41
32
31
27
24
55
20172
53
63
27
31
29
53
2018
46
47
35
47
35
64
2019
60
60
47
33
27
73
20202
64
30
40
41
59
48
20212
50
32
44
43
45
74
2022
64
37
43
-
-
-
2023
73
60
43
32
66
34
Table A7.9. NORWAY REDFISH ( Sebastes viviparous). Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea standard area winter 1994-2023.
1 REZ not covered.
2 REZ partly covered.
Length group (cm)
Biomass(tons)
Year
≤14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
60-64
65-69
70-74
75-79
≥ 80
Total
1994
0
0
21
76
148
1117
3139
4740
3615
1941
889
541
21
0
0
16248
19228
1995
298
0
0
0
90
129
2877
7182
5739
2027
1622
839
489
86
0
21378
27459
1996
4121
0
0
0
62
124
1214
4086
4634
1871
1112
638
337
74
12
18285
20256
19971
0
68
0
0
55
163
949
4313
5629
2912
1609
643
300
65
21
16728
24214
19981
68
220
945
578
481
487
1088
4016
6591
3076
1798
707
326
93
44
20518
27248
1999
43
84
241
436
566
269
784
1701
3097
1669
1094
491
89
75
0
10640
14681
2000
140
184
344
836
1722
3857
2253
1560
2144
1714
1191
615
249
76
0
16883
17246
2001
68
49
147
179
737
1525
3716
3271
2302
2010
1088
529
160
50
39
15871
18224
2002
271
0
70
34
382
1015
1916
3803
3250
2279
1138
976
242
159
114
15648
21198
2003
51
0
74
19
304
715
1842
3008
4765
2235
714
561
245
146
0
14678
19635
2004
106
104
15
0
319
1253
1229
1717
2277
1227
798
298
148
94
26
9615
11872
2005
263
70
159
1139
2235
2621
4206
3782
3847
2037
917
585
336
118
0
22314
22293
20062
0
72
94
414
1968
5149
4613
5743
4283
2132
891
449
258
34
18
26118
25579
20071
0
18
146
1869
1418
3114
5710
5947
4287
2205
963
658
391
80
89
26896
28006
2008
0
0
0
243
1708
5974
4654
6136
5198
3403
827
638
174
82
50
29088
30153
2009
55
0
0
26
1044
4327
8133
4551
4084
2266
996
627
442
253
154
26960
28919
2010
0
0
0
99
678
3648
5729
6560
4897
2467
1064
552
229
128
41
26092
25979
2011
51
0
0
0
216
4396
5864
5498
5237
3698
699
936
327
252
97
27271
31552
20123
77
0
0
0
51
1145
4524
5366
4517
2774
1147
195
73
0
48
19917
22656
2013
0
0
0
0
0
511
5368
4868
5374
3687
1944
939
348
313
154
23504
31748
2014
0
0
46
92
156
368
2271
5587
5903
3555
2251
1369
154
260
79
22090
31112
2015
367
0
61
0
284
1612
3187
6452
7249
6752
3350
1936
587
334
0
32172
46828
2016
205
0
124
511
950
1953
3486
4539
5479
5613
1999
1973
646
98
80
27657
35831
20174
52
0
0
78
592
1328
1885
3850
4852
4550
1721
1455
317
190
23
20827
29756
2018
0
0
62
0
383
1333
2049
3445
4258
3573
1904
1366
736
196
20
19325
28688
2019
0
0
0
375
272
1671
3285
4034
5177
4265
3570
2526
1328
535
137
27176
45912
20203*
80
91
246
442
790
2272
4391
5136
4929
4613
3278
1803
894
384
250
29599
43631
20213
0
154
927
927
2370
2976
3869
4265
3516
2991
2378
1649
670
682
238
27613
37090
20223
0
0
822
2165
3696
1831
3365
5322
5672
3621
2230
1543
799
432
135
31635
39584
20233
0
0
59
746
6486
8816
5302
5792
7284
3951
2065
1369
1001
57
338
43266
47622
Table A8.1. GREENLAND HALIBUT. Abundance indices (numbers in thousands) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
1 Indices raised to also represent the Russian EEZ.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
3 Indices not raised to also represent uncovered parts of the Russian EEZ.
4 Indices raised to also represent uncovered parts of the Russian EEZ.
* The 2020 indices were updated in 2021 after an error was discovered in the calculations.
Length group (cm)
Biomass(tons)
Year
≤14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
60-64
65-69
70-74
75-79
≥ 80
Total
2014
0
134
141
0
138
453
1350
1443
1351
293
803
39
117
0
0
6261
7366
2015
0
0
0
269
30
263
550
863
597
567
555
66
107
38
0
3903
5092
2016
678
933
607
436
336
431
331
728
340
254
68
34
140
0
34
5349
3059
2017
31
0
0
193
583
861
662
456
301
33
298
30
0
34
0
3485
2990
2018
136
28
0
434
775
1840
1099
1042
776
634
360
511
0
0
0
7636
7528
2019
296
92
81
78
137
1072
1144
1384
896
649
638
297
24
40
0
6826
8118
2020*
36
0
0
0
0
169
160
322
32
31
66
62
0
0
0
878
889
2021
1807
3961
3859
2159
1207
863
564
1612
1127
885
495
190
23
0
0
19704
10187
2022
263
0
1204
693
3157
3197
5502
5985
2057
868
337
280
87
0
0
23630
18191
2023
865
0
509
259
1478
1086
753
138
327
292
68
35
35
0
0
5336
3100
Table A8.2. GREENLAND HALIBUT. Abundance indices (numbers in thousands) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023.
* The 2020 indices were updated in 2021 after an error was discovered in the calculations.
Length group (cm)
Year
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
60-64
65-69
70-74
75-79
80-84
1994
0
0
105
57
46
28
17
20
17
15
20
26
97
-
-
1995
91
-
-
-
71
40
18
22
25
24
27
41
63
94
-
1996
33
-
-
-
69
45
22
25
18
19
36
29
40
58
-
19971
-
53
-
-
82
48
26
23
18
16
16
24
28
73
101
19981
66
53
26
44
42
18
22
23
28
26
28
31
33
50
101
1999
91
54
53
26
32
31
24
21
18
16
18
25
52
51
-
2000
71
66
72
83
56
58
41
20
22
23
21
36
45
54
-
2001
92
99
85
47
40
48
44
46
37
14
17
34
43
56
-
2002
71
-
70
104
29
27
17
13
16
16
14
27
24
37
55
2003
66
-
63
95
30
27
20
44
34
32
44
28
38
37
-
2004
78
59
97
-
26
17
16
16
17
17
15
29
39
46
92
2005
66
70
37
46
33
15
19
17
16
20
25
24
28
64
-
20062
-
81
81
67
32
18
18
11
11
16
22
22
30
67
-
20071
-
99
52
23
20
13
12
12
14
14
24
37
26
44
99
2008
-
-
-
36
20
21
15
14
18
14
22
20
43
56
68
2009
98
-
-
103
23
14
16
16
19
18
17
21
26
46
53
2010
-
-
-
57
26
18
13
12
14
18
19
23
45
57
101
2011
66
-
-
-
43
18
15
14
17
14
25
26
33
46
70
20122
93
-
-
-
100
23
13
14
14
11
24
70
72
-
-
2013
-
-
-
-
-
44
39
12
16
20
19
33
50
50
-
2014
-
-
99
68
68
37
20
14
20
18
18
24
53
51
72
2015
83
-
99
-
49
24
22
15
13
18
34
37
33
46
-
2016
-
-
101
50
43
31
21
34
26
31
16
20
36
70
98
20172
102
-
-
72
42
25
23
13
14
17
21
26
45
65
95
2018
-
-
107
-
51
24
15
18
18
15
17
23
32
54
93
2019
-
-
-
54
37
20
20
24
21
17
16
17
23
31
68
20202
90
73
101
62
42
21
14
14
14
15
14
15
24
51
51
20212
-
67
46
40
46
27
15
16
12
15
16
20
26
28
50
2022
-
-
42
53
33
23
14
11
15
13
16
18
22
35
54
2023
-
-
94
54
40
28
32
34
23
21
14
19
32
67
48
Table A8.3. GREENLAND HALIBUT. Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea standard area winter 1994-2023
1 Russian EEZ not covered. 2 Russian EEZ partly covered.
Length group (cm)
Biomass
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
≥40
Total
(‘000 t)
1994
0
0
1.2
13.6
25.7
10.9
1.1
0.1
52.6
NA
1995
0
0.5
0.8
2.4
10.3
10.8
3.9
0.2
29.0
NA
1996
0
80.0
1371.8
8.4
18.6
7.1
3.8
0.1
1489.9
38.2
19971
0
608.7
681.5
273.8
3.1
5.3
1.8
0.1
1574.3
NA
19981
0
1.2
34.5
42.2
3.6
1.5
1.4
0.1
84.5
NA
1999
0
0.02
11.0
40.0
16.1
5.0
1.7
0.1
74.0
NA
2000
0
12.3
557.5
44.1
25.7
4.4
0.7
0.1
644.9
NA
2001
0.04
311.6
1420.8
631.5
46.0
5.4
1.6
0.1
2417.0
NA
2002
0
0.9
428.9
636.3
77.6
17.5
3.2
0.1
1164.4
56.6
2003
0
3.9
220.5
493.4
73.4
28.0
4.0
0.3
823.4
48.1
2004
0
7.1
712.0
821.6
276.2
37.8
1.1
0.2
1856.0
95.8
2005
0
125.1
717.2
984.7
223.3
31.8
0.1
0.1
2082.4
105.0
20062
0
0
164.4
1500.5
598.0
69.0
2.0
0.1
2333.9
172.9
20071
0
0
4.0
628.0
299.3
23.5
1.6
0.4
956.8
79.8
2008
0
0
0.3
12.1
126.1
19.8
1.3
0.1
159.7
20.6
2009
0
0
0.02
2.7
50.6
21.2
1.5
0.02
76.1
11.4
2010
0
0
0.5
1.6
9.4
16.9
1.0
0
29.4
5.2
2011
0
0
0.1
0.3
2.8
5.1
2.5
0
10.6
2.2
20121
0
85.6
674.6
1.1
1.8
5.3
2.0
0.3
770.7
18.2
2013
0
0
75.3
395.9
12.6
11.5
6.8
0.1
502.2
28.6
2014
0
0
182.1
34.2
9.7
1.6
1.5
0.04
229.2
8.5
2015
0
115.6
907.4
141.2
40.8
8.8
7.4
0
1221.3
34.2
2016
0
0.1
260.0
367.6
38.0
6.3
3.0
0.1
674.9
39.1
20171
0
0
29.1
939.6
279.2
26.1
11.5
0.05
1285.6
99.7
2018
0
0.02
0.8
45.4
50.2
8.3
1.7
0
106.5
10.5
2019
0.1
1.7
54.4
4.5
35.9
13.0
1.0
0.09
110.7
9.2
20201
0.2
14.3
154.9
25.4
7.9
8.1
0.6
0
212.8
11.5
20211
0
1.5
857.8
88.9
11.1
2.1
0.2
0
961.9
37.5
20221
0
13.3
311.0
260.6
11.6
3.5
1.3
0
601.4
25.9
2023
0
0
41.0
226.7
66.0
8.1
1.1
0.1
343.0
23.3
Table A9.1. BLUE WHITING. Abundance indices (numbers in millions) from bottom trawl surveys in the Barents Sea standard area winter 1994-2023.
1 Indices not raised to represent the Russian EEZ or uncovered parts , blue whiting is mainly found in areas A, B, C and S.
2 Not complete coverage in southeast due to restrictions, strata 7 area set to default and strata 13 as in 2005.
Length group (cm)
Total
Biomass
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
≥40
(‘000 t)
2014
0
0
0.29
0.28
0.10
0.19
0.13
0
1.0
0.12
2015
0
0
0.16
0.10
0.25
0.78
0.42
0
1.7
0.27
2016
0
0
2.12
5.35
1.54
0.46
0.35
0
9.8
0.84
2017
0
0
0.08
20.91
4.10
1.34
0.39
0
26.8
1.98
2018
0
0
0
0.16
0.37
0.23
0.16
0
0.9
0.13
2019
0
0
0.03
0.21
0.71
0.70
0.24
0
1.9
0.34
2020
0
0
0.11
0.27
0
0.13
0
0
0.5
0.05
2021
0
0
9.60
3.53
0.48
0.41
0.07
0
14.1
0.63
2022
0
0
1.77
4.15
0.17
0.10
0
0
6.2
0.32
2023
0
0
0.08
0.98
1.1
1.41
0.33
0
3.9
0.56
Table A9.2. BLUE WHITING. Abundance indices (numbers in millions) for new strata 24-26 from bottom trawl surveys in the Barents Sea winter 2014-2023.
Length group (cm)
Year
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
1994
-
-
94
68
51
28
31
49
1995
-
59
55
51
66
32
28
48
1996
-
49
79
56
49
30
33
59
19971
-
30
29
33
36
29
37
70
19981
-
91
60
33
35
33
28
70
1999
-
98
26
27
28
31
43
71
2000
-
37
21
20
25
29
31
95
2001
69
21
18
25
26
35
39
90
2002
-
56
25
17
20
33
52
69
2003
-
87
47
23
17
27
58
83
2004
-
86
23
19
15
14
30
61
2005
-
28
25
16
24
24
71
90
20062
-
-
17
12
13
26
46
61
20071
-
-
50
16
12
17
42
84
2008
-
-
51
59
27
22
47
82
2009
-
-
97
60
21
20
61
95
2010
-
-
91
80
29
25
33
-
2011
-
-
100
88
45
48
62
-
20122
-
32
30
39
45
38
29
98
2013
-
-
70
31
57
44
44
99
2014
-
-
23
23
24
27
18
137
2015
-
50
21
21
31
31
37
-
2016
-
96
33
24
17
27
29
97
20172
-
-
24
16
16
16
42
101
2018
-
102
49
25
17
19
32
-
2019
68
37
38
29
35
31
50
101
20202
94
90
39
27
28
29
46
-
20212
-
48
23
30
32
24
45
-
20222
-
73
25
18
29
34
72
-
2023
-
-
32
24
21
33
47
100
Table A9.3. BLUE WHITING. Estimates of coefficients of variation (%) for swept area abundance indices. Barents Sea standard area winter 1994-2023.
1 Russian EEZ not covered.
2 Russian EEZ partly covered.
Appendix 2. Survey design and methods for target species index calculation
Introduction
The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort of the combined survey has been 10-14 vessel-weeks, and about 350 bottom trawl hauls have been made each year. After 2018, the Russian zone has been relatively well-covered and around 500 bottom trawl hauls have been made each year. Most years three vessels have participated from about February 1 to March 15.
The purpose of the investigations is presently:
Obtain acoustic abundance indices by length and age for cod and haddock
Obtain swept area abundance indices by length and age for cod and haddock
Obtain swept area abundance indices by length for redfish, Greenland halibut and blue whiting
Map the geographical distribution of those fish stocks
Estimate length, weight and maturity at age for cod and haddock
Collect stomach samples from cod, for estimating predation by cod
Map the distribution of capelin (pre-spawning) and polar cod
Data and results from the survey are used both for stock assessments in the ICES Arctic Fisheries Working Group (AFWG) and by several research projects at IMR and PINRO, the Polar branch of the Russian Federal Research Institute of Fisheries and Oceanography (VNIRO).
From 1981 to 1992 the survey area was fixed (strata 1-12, main areas ABCD in Fig. 2.1). Due to warmer climate and increasing stock size in the early 1990s, the cod distribution area increased. Consequently, in 1993 and further in 1994 the survey area was extended to the north and east (strata 13-23, main areas D’ES in Fig. 2.1) to obtain a more complete coverage of the younger age groups of cod, and since then the survey has aimed at covering the whole cod distribution area in open water. For the same reason, the survey area was extended further northwards in the western part in 2014 (strata 24-26 in Fig. 2.1). In many years since 1997 Norwegian research vessels have had limited access to the Russian EEZ, and in 1997, 1998, 2007 and 2016 the vessels were not allowed to work in the Russian EEZ. In 1999 a rather unusually wide ice-extension partly limited the coverage. Since 2000, except in 2006, 2007 and 2017, Russian research vessels have participated in the survey and the coverage has been better, but for various reasons incomplete in most years. Table 1.3 in the main report summarizes degree of coverage and main reasons for incomplete coverage in the survey.
According to the joint IMR-PINRO long-term monitoring plan for the Barents Sea, developed during a series of meeting between the institutes, and agreed to be implemented at the annual meeting between Russian and Norwegian scientists in Tromsø, 13-15 March 2018, the winter survey is from 2019 a joint IMR-PINRO survey with commitments from both institutes to obtain a total coverage of the main demersal fish resources in the area.
Methods
Swept area measurements
All vessels were equipped with the standard research bottom trawl Campelen 1800 shrimp trawl with 80 mm (stretched) mesh size in the front. Prior to 1994 a cod-end with 35-40 mm (stretched) mesh size and a cover net with 70 mm mesh size were mostly used. Since this mesh size may lead to considerable escapement of 1-year-old cod, the cod-ends were in 1994 replaced by cod-ends with 22 mm mesh size. At present a cover net with 116 mm meshes is mostly used.
The trawl is now equipped with a rockhopper ground gear (Engås and Godø 1989). Until and including 1988 a bobbins gear was used, and the cod and haddock indices from the period 1981-1988 have since been recalculated to ‘rockhopper indices’ and adjusted for length dependent catch efficiency and/or sweep width (Godø and Sunnanå 1992, Aglen and Nakken 1997). The sweep wire length is 40 m, plus 12 m wire for connection to the doors.
In the Norwegian Barents Sea shrimp survey (Aschan and Sunnanå 1997) the Campelen trawl has been rigged with some extra floats (45 along the ground rope and 18 along the under belly and trunk, all with 20mm diameter) to reduce problems on very soft bottom. This rigging has been referred to as “Tromsø rigging”. When the shrimp survey was terminated 2004 and later merged with the Barents Sea Ecosystem survey in 2005, improved shrimp data were also requested from the winter survey, and the “Tromsø rigging” was used in parts of the shrimp areas in 2004 (11 stations) and 2005 (9 stations). In 2006-2014 “Tromsø rigging” was used for nearly all bottom trawl stations taken by Norwegian vessels in the winter survey, while since 2015 this rigging has not been applied.
Vaco doors (6 m2, 1500kg), were previously standard trawl doors on board the Norwegian research vessels. On the Russian vessels and hired vessels V-type doors (ca 7 m2) have been used. In 2019 the Russian vessel used 5 m2 “Sparrow” trawl doors weighing 2000 kg. In 2004, R/V “Johan Hjort” and R/V “G.O. Sars” started using a V-type door for bottom trawling (Steinshamn W-9, 7.1m2 , 2050 kg), the same type as used on the Russian research vessels. In 2010 the V-doors were replaced by 125” Thyborøn trawl doors. R/V “Helmer Hanssen” has used Thyborøn trawl doors since the 2008 survey. To achieve constant sampling width of a trawl haul independent of e.g. depth and wire length, a 10-15 m rope “locks” the distance between the trawl wires 80-150 m in front of the trawl doors on the Norwegian vessels. This is called “strapping”. The distance between the trawl doors is then in most hauls restricted to the range 48-52 m regardless of depth (Engås and Ona 1993, Engås 1995). Strapping was first attempted in the 1993 survey on board one vessel, in 1994 it was used on every third haul and in 1995-1997 on every second haul on all vessels. Since 1998 it has been used on all hauls when weather conditions permitted. Strapping is not applied on the Russians vessels, but the normal distance between the doors is about 50 m (D. Prozorkevich, pers. comm.).
Standard tow duration is now 15 minutes (until 1985 the tow duration was 60 min. and from 1986 to 2010 30 min.). Trawl performance is constantly monitored by Scanmar trawl sensors, i.e., distance between the doors, vertical opening of the trawl and bottom contact control. In 2005-2008 sensors monitoring the roll and pitch angle of the doors were used due to problems with the Steinshamn W-9 doors. The data is logged on files, but have so far not been used for further evaluation of the quality of the trawl hauls.
At the start of the survey at least two of the trawls on the Norwegian vessels undergo a “sea test”. The purpose of the test is to check that the geometry of the trawl is within the specified limits and that the trawl performance is satisfactory, especially that the bottom contact is stable. It is further checked that the trawl sensors operate as they should.
The positions of the trawl stations are pre-defined. When the swept area investigations started in 1981 the survey area was divided into four main areas (A, B, C and D, Fig 2.1) and 35 strata.
Figure 2.1. Strata (1-23) and main areas (A,B,C,D,D’,E and S) used for swept area estimations and acoustic estimations with StoX. Additional strata (24-26, main area N) are covered since 2014, and are from 2020 included in the standard time series for haddock and from 2021 in the time series for cod.
During the first years, the number of trawl stations in each stratum was set based on expected fish distribution to reduce the variance, i.e., more hauls in strata where high and variable fish densities were expected to occur. During the 1990s trawl stations were spread out more evenly, yet the distance between stations in the most important cod strata is shorter (16 or 20 NM) compared to the less important strata (24, 30 or 32 NM). Considerable amounts of young cod were now distributed outside the initial four main areas, and in 1993 the investigated area was therefore enlarged by areas D’, E, and the ice-free part of Svalbard (S) (Fig. 2.1 and Table 1.3 in main report), 28 strata altogether. In the 1993-1995 survey reports, the Svalbard area was included in area A’ and the western part of area E (west of 30 ° E). Since 1996 a revised strata system with 23 strata has been used (Figure 2.1). The main reason for reducing the number of strata was the need for enough trawl stations in each stratum to get reliable estimates of density and variance. In 2014 the investigated area was enlarged by three new strata in northwest, 24-26 (main area N, Fig. 2.1). From 2020, these strata were included in the swept area and acoustic indices for haddock and from 2021, they were included for cod (see next section). They are not yet included in the standard time series for the other species, but presented separately.
Sampling of catch and age-length keys
Sorting, (sub)sampling, weighing, and measuring of the catch are done according to instructions given in Mjanger et al . (2021). Since 1999 all data except age are recorded electronically by Scantrol Fishmeter measuring board, connected to stabilized scales. The whole catch or a representative sub sample of most species is length measured at each station.
At each trawl station, one cod and haddock per 5 cm length-group is sampled for age (otoliths), individual weights, sex, and maturity. For cod, stomach samples are also taken from the same individuals. For the largest cod, other sampling schemes have been used in some years; in 2007-2009, all cod above 80 cm were sampled, and in 2010 all above 90 cm were sampled, limited to 10 per station. The stomach samples from cod are frozen and analysed after the survey. Greenland halibut otoliths are also sampled from one specimen per 5 cm length-group, while otoliths from the redfish species Sebastes norvegicus and S. mentella are sampled from two fish in every 5-cm length-group at every station. Table A2.1 in the annual report gives an account of the sampled material, and further details on the sampling protocol can be found in the sampling manual for the Winter survey (updated annually).
Swept area fish density estimation
Swept area fish density estimates ( rk,l,s ) for each station s in stratum k are first estimated by length ( l ) for each bottom trawl haul by the equation:
number of fish of length l per n.m.2 observed on trawl station s in stratum k
estimated frequency of length l
swept area:
towed distance (nm)
length dependent effective fishing width. The fishing width was previously fixed to 25 m = 0.0135 nm. Based on Dickson (1993a,b, Table 1), length dependent effective fishing width was included in the calculations for cod and haddock from 1995 (Korsbrekke et al ., 1995) as such:
for
= for
= for
Species
a
b
lmin
lmax
Cod
5.91
0.43
15 cm
62 cm
Haddock
2.08
0.75
15 cm
48 cm
Table 1: Species-specific parameters from Dickson (1993a, b) used to calculate length-dependent effective fishing width for cod and haddock.
For redfish, Greenland halibut and other species, a fishing width of 25 m is applied, independent of fish length.
After applying the length-dependent effective fishing width, the station-specific length distributions (swept area density by length) are aggregated into 5 cm length groups.
Next, the abundance (N individuals) by 5 cm length group l and stratum k are calculated as:
Where A is the area (nmi2) of stratum k and ρk,l is the average swept area density by l in the stratum, given by:
Where n is the number of stations in the stratum.
A two-stage conversion process is used to convert the abundance of fish by length group to abundance of fish by age group. First, the abundance (Nk,l ) by length group and stratum is distributed on the length-measured individuals (j) to generate so-called “Super-individuals” (super-individuals represent fractions of a total; our use corresponds to a probability-based design where is the inverse of the inclusion probability for a single fish sample), each representing an abundance estimated as:
Where,
and m is the number of length-measured individuals.
Second, in instances where a super-individual is not aged, the missing age is filled in by a random data imputation. The imputation of missing age is first carried out at the station level, randomly selecting the value from aged super-individuals within the same length group. If no aged super-individual is available at the station level, the imputation is attempted at strata level, or lastly at survey level. In instances where no age information is available at any level for a specific length group, the abundance estimate is presented with unknown age (Johnsen et al., 2019).
Acoustic measurements
The method is explained by Dalen and Smedstad (1979, 1983), Dalen and Nakken (1983), MacLennan and Simmonds (1991) and Jakobsen et al. (1997). The acoustic equipment has been continuously improved. Since the early 1990s Simrad EK500 echo sounder and Bergen Echo Integrator (BEI, Knudsen 1990) were used. The Simrad EK60 echo sounder replaced the EK500 on R/V “Johan Hjort” in 2005 and on R/V “Helmer Hanssen” since 2008. The latest R/V “G.O. Sars” has used EK60 since it replaced R/V “Sarsen” (former R/V “G.O. Sars”) in 2004. The Large Scale Survey System (LSSS, Korneliussen et al . 2016) replaced BEI on R/V “G.O. Sars” and R/V “Johan Hjort” in 2007 and on R/V “Helmer Hanssen” since 2008. On the Russian vessels EK 500 was used from 2000 to 2004 and ER60 since 2005. The new Simrad EK80 echo sounder has been used on R/V “G.O. Sars” since 2017 and on R/V “Johan Hjort” since 2018. In 2023 LSSS v. 2.13.0 was used on the Norwegian vessels and LSSS v. 1.9.0 on the Russian vessel.
In the mid-1990s the echo sounder transducers were moved from the hull to a retractable centreboard, on R/V “Johan Hjort” since the 1994 survey, on R/V “Sarsen” (former R/V “G.O. Sars”) since 1997, on the latest R/V “G.O. Sars in 2004 and on R/V “Helmer Hanssen” since the 2008 survey. This latter change has largely reduced the signal loss due to air bubbles in the close to surface layer. None of the Russian vessels have retractable centreboards.
On both Norwegian and Russian vessels, acoustic backscattering values (sA = nautical area scattering coefficient NASC) are stored at high resolution in LSSS. After scrutinizing and allocating the values to species or species groups, the values are stored with 10 m vertical resolution and 1 nautical mile (NM) horizontal resolution. The procedure for allocation by species is based on:
composition in trawl catches (pelagic and demersal hauls)
the appearance of the echo recordings
inspection of target strength distributions
inspection of target frequency responses
For each trawl catch the relative sA-contribution from each species is calculated (Korsbrekke 1996) and used as a guideline for the allocation. In these calculations, the fish length dependent catching efficiency of cod and haddock in the bottom trawl (Aglen and Nakken 1997) is taken into account. There is no reason to believe that trawl catches give an accurate representation of species composition in the sea, so the calculated sA -contribution from the trawl hauls are used as a guidance only.
Acoustic fish density estimation
Within each stratum, the acoustic course tracks are divided into transects that are separated by changes in heading. A distance of about 2 nautical miles around each turn is not included in the transects. When the time series 1994-2017 was converted to StoX, the specification of transects was done by first running a R-script tagging all the transects and then the transects were inspected and edited manually in StoX if necessary. Minimum length of a transect was set to 4 nautical miles and the location of trawl stations were used to cut the tracks into transects, i.e., they were limited by trawl location as well as the heading of the ship. In this process miles with obvious errors in the sA -values, e.g., bottom contribution, were removed from the transects. From 2018, all transects have been defined manually using the built-in functionality in the StoX software with the approach of stopping the transect for changes in heading only.
For each transect and stratum, an arithmetic mean sA is calculated for the water column. The conversion of mean NASC (m2 nmi−2 ) to density of fish follows a standard procedure where all trawl stations within a stratum with a catch of more than 5 individuals are assigned to each PSU. If less than 3 trawl stations had been carried out in a stratum, stations in neighbouring strata are manually assigned to the PSUs such that at least 3 stations are assigned to each PSU. From 2021, the criterion of having minimum 5 individuals in the catch was excluded as this type of filtration is not implemented in the new StoX version.
The combined length distribution ( d ) is calculated for each transect (PSU ( j )) as:
where dl,s,j is density (number by 1 NM tow distance) by 1 cm length group ( l ) for the stations ( s ) assigned to PSU ( j ).
The trawl catches are normalised to 1 NM towing distance and adjusted for length dependent catch efficiency as describe for swept area estimation above.
The areal density of fish (ρ) (n per nmi2 ) by length group l by transect j is calculated as
where NASCj,l is the mean nautical area scattering coefficient by transect (j) and length group (l) and σl is the acoustic backscattering cross-section for a fish of length l .
NASCj,l is calculated as:
where σl,p is the acoustic backscattering cross-section for a fish of length l multiplied with the proportion (p) of a fish of length l in the total length distribution and NASCj is the mean nautical area scattering coefficient in transect j .
The acoustic backscattering cross-section (m2 ) for a fish of length l is calculated as
where the target strength, TS , for a fish of length l (cm) is calculated as
Where m and a are constants. For cod and haddock, we apply:
(Foote, 1987)
The fish abundance ( N ) by length group ( l ) for stratum k is then:
,
where A is stratum area and the mean density of fish of length group l and stratum k is:
where (j= 1,2, nk) are the lengths of the nk sample transects.
Estimates by length are converted to estimates by age using the same imputation method described for the swept area index estimation. The abundance by stratum is then summed for defined main areas (Figure 2.1).
Software for index estimation
The new Sea2Data software StoX has been applied to estimate acoustic indices with CVs for cod and haddock and swept area indices with CVs for cod, haddock, golden redfish, beaked redfish, Norway redfish, Greenland halibut and blue whiting (Mehl et al. 2016, 2018). The main difference between StoX and the SAS-based BEAM software previously used (years 1981-1993 of the time-series, see earlier survey reports for results and method details) is in the use of the age-length data. StoX does not use age-length keys (ALK) in the traditional sense with ALKs estimated for large areas. Missing age information is instead imputed from known age-length data within station, strata, or the entire survey (see below). In addition, in the acoustic abundance estimation, StoX transects are defined within each stratum (Figure 2.1) as primary sampling units (PSUs) and used to calculate acoustic density (Jolly and Hampton 1990), as opposed to the BEAM method that divided the survey area into rectangles, calculating average acoustic densities (sA ) in each. StoX also allows for uncertainty estimation by bootstrapping primary sampling units (PSUs). Another main feature is storing of all user input and software versions in a version controlled file.
The entire haddock time series was revised in 2020 using StoX, in connection with the ICES Benchmark Workshop for Demersal Species (ICES 2020). This involved including strata 24-26 in the official time series from 2014, the use of bootstrap mean instead of baseline estimates for abundance at age and standardising the length groups used in the length-dependent sweep width function (Fall 2020). The additional strata were also included in the acoustic index for haddock, while the other changes were made to the swept area index only. In 2021, the same changes were made to the cod time series (ICES 2021). The revised swept area index for haddock was produced with R version 3.5.3 (years 1994-2013) and R version 3.6.2 (years 2014-2019). From 2022, the haddock acoustic index is also presented as bootstrap mean abundances.
In the update of R to 3.6.X, the random seed generator was changed, which means that the same seed will give slightly different results compared to 3.5.X. This results in minor differences to the bootstrapped estimates if old StoX projects are run with the new R version.
StoX input, filters and settings for cod and haddock
The different functions and settings used in swept area estimation for cod and haddock in StoX are detailed in Table 2. The functions are divided into the three parts of the StoX estimation process: baseline, analysis, and report.
Function
Settings
Purpose
Baseline
ReadBiotic
FileNames: paths to xml-files in biotic folder
Reads in versioned biotic files.
StoxBiotic
-
Converts and trims data (only keeps key variables, standardises variable names etc.) to a common format used in StoX.
Data filtering; removes extra hauls taken on acoustic registrations and unsuccessful hauls, selecting data from bottom trawl only. See https://kvalitet.hi.no/docs/pub/DOK06839.pdf for explanation of the different codes used in the data.
Data filtering; selecting data for the target species. For haddock, the SpeciesCategory is: "hyse/164744/126437/Melanogrammus aeglefinus\" Filter upwards set to FALSE in order to keep stations with zero catch of haddock to get representative average swept area densities.
Calculates length frequency distributions for each station and haul. ‘Normalized’ refers to a length distribution that is standardised to one nautical mile towing distance (i.e., weighted by CPUE). The RaisingFactorPriority relates to how weighting is handled when the haul contains different subsamples for the same species. See StoX documentation for more details on length distributions.
Sets the length distribution resolution to 1 cm, i.e., 1 cm length groups. There may be length distributions with finer resolution, this will standardise it.
Adjusts the length distributions for increasing catchability with length (based on the Dixon experiments). For haddock, the parameters are: [{"SpeciesCategory": "hyse/164744/126437/Melanogrammus aeglefinus","Alpha": 2.08, "Beta": 0.75, "LMin": 15, "LMax": 48}
Calculates the mean length distribution for each PSU by summing vertically and averaging horizontally. This allows mean length distributions to be calculated across e.g., hauls taken at the same PSU (station), but different depths. For the cod and haddock projects there is only one haul per PSU, which means that the purpose of this function is to define PSUs and convert the LengthDistribution object to a MeanLengthDistribution object for use in further calculations.
Calculates the area density of fish (number of individuals per square nautical mile). The sweep width method is set to pre-defined since this is already taken care of by the LengthDependentCatchCompensation process.
MeanDensity
DensityData: SweptAreaDensity
Calculates the average swept area density in each stratum. The average is weighted by the number of hauls per PSU, meaning that for a standard swept area project with one haul per PSU, this will be an unweighted average. For acoustic projects, the mean acoustic density is weighted by the effective log distance.
Calculates the total abundance of each length group (also species category and layer when relevant) in each stratum based on the mean swept area density and stratum area.
Distributes abundance on the individuals, turning them into “Superindividuals”, each representing a part of the total abundance. Abundance can be divided equally on all individuals, or it can be divided proportionally to the density of the individual’s length group in the haul in which it was caught. Needed to get indices by age and to weigh biological parameters by abundance.
Identifies individuals that have missing data for a specified variable (here: age, as specified in “ImputeAtMissing”), and assigns the missing variables (and possibly others specified in “ToImpute”) by random sampling from other individuals in the same length group. First, the function looks for suitable individuals from the same haul. If there are none, the random draw extends to other hauls in the stratum, and lastly to the entire survey. Will return NA if no other individuals in the same length group have been aged in the survey. This has the advantage over a traditional age-length key in that it allows imputation of other variables than age.
This function runs a subset of the baseline model several times (as specified in “NumberOfBootstraps”) after resampling trawl hauls in each stratum (with replacement). Here, the baseline model is rerun from MeanLengthDistribution to ImputeSuperIndividuals, calculating new length distributions based on the resampled trawl hauls and redoing the age imputation. The “UseOutputData” option can be used if, e.g., new reports are to be generated from a bootstrap object that has already been run – this option reads in the bootstrap object rather than running it again. The number of cores can be set higher if relevant (will use max number of cores if less than 8).
Report bootstrap abundance. This function gives specified quantiles and mean, sd and CV of abundance by age. The bootstrap mean abundance is used as the official estimate of swept area abundance for cod and haddock. The “Percentages” parameter defines the quantities to report, here it is set to 5 %, 50 % and 95 %. This is the same for the other reports defined below.
Report bootstrap mean length at age. The mean lengths are weighted by superindividual abundance at age (i.e., individuals from abundant length groups get higher weight).
Report bootstrap mean weight at age. The mean weights are weighted by superindividual abundance at age (i.e., individuals from abundant length groups get higher weight).
Table 2: StoX functions and settings used in the cod and haddock swept area estimations, split on the three parts of the StoX estimation process; baseline, analysis, and report. Updated for StoX v. 3.6.1.
*Note that this is the function name, not the process name – the latter can be freely decided by the user. If a function is used more than once, unique processes names must be given and care must be taken to refer to the right process in subsequent steps of the estimation process (as indicated by numbers after the function name).
Table 3 details the functions and settings used for cod and haddock acoustic estimation in StoX.
Function
Settings
Details
Baseline
ReadAcoustic
FileNames: paths to xml-files in acoustic folder
Reads in versioned acoustic files.
StoxAcoustic
-
Converts and trims data (only keeps key variables, standardises variable names etc.) to a common format used in StoX.
Select data from 38 kHz only (in case data is stored on multiple frequencies) and select only pelagic channel data (which contains data from entire water column; the bottom channel “B” is just stored at a higher resolution).
In some cases, the beam names are different on Norwegian and Russian vessels. This defines a key that connects the two names and is used to make sure all data from 38 kHz are included.
Assigns trawl stations to each acoustic PSU; all trawl stations within the same strata as the acoustic PSU will be assigned to that PSU. In the case of few trawl stations in a strata, additional trawls from neighbouring strata can be added manually in the map window.
How to weight the trawl stations when calculating length distributions for each PSU. The “SumWeightedCount” option gives weighting values that are proportional to the normalized length distribution count (i.e., cpue) in the haul.
Specifies the target strength-length relation for the target species. The same settings are used for cod and haddock, except that the AcousticCategory is set to “30”.
Calculate number density based on the acoustic target strength-length relationship. For haddock: SpeciesLink: [{"AcousticCategory": "30","SpeciesCategory": "hyse/164744/126437/-Melanogrammus aeglefinus"}]
MeanDensity
DensityData: AcousticDensity
Calculates the weighted average density in each stratum. The weights are the effective log distance of each acoustic PSU.
As above. Currently, the length distribution data is not regrouped to 5 cm length bins in the acoustic projects. This should be considered in the next revision.
Table 3: StoX functions and settings used in the cod and haddock acoustic estimations, split on the baseline and analysis part of the StoX estimation procedure. For details on functions used also in the swept area index (including report generation), refer to table 2. Updated for StoX v. 3.6.1.
Estimation of variance
The acoustic and swept area survey indices are presented together with an estimate of uncertainty (coefficient of variation; CV). These estimates are obtained from the bootstrap routine presented under the analysis section of Table 2. In the bootstrap of acoustic indices, each transect is treated as the primary sampling unit. In addition, a bootstrap routine for all trawl stations by strata is carried out within each run. The estimated CV (Standard Deviation ∙ 100/mean) is estimated from 500 iterations.
References
See section 10 in main report.
Appendix 3. Changes in survey design, methods, gear etc.
Changes to survey design and equipment
Year
Change from
To
1984
Representative age sample, 100 per station
Stratified age sample, 5 per 5-cm length group
1986
1 research vessel, 2 commercial trawlers
2 research vessels, 1 commercial trawler
1987
60 min. tow duration
30 min. tow duration
1989
Bobbins gear
Rock-hopper gear
1990
Random stratified bottom trawl stations
Fixed station grid, 20 nm distance
Simrad EK400 echo sounder
Simrad EK500 echo sounder and BEI post processing
1993
Fixed survey area (ABCD), 1 strata system, 35 strata
No constraint technique (strapping) on bottom trawl doors
Constraint technique on some bottom trawl hauls
5 age samples per 5-cm group, 2 per stratum
2 age samples per 5-cm group, 4 per stratum (cod and haddock)
1994
35-40 mm mesh size in cod-end
22 mm mesh size in cod-end
Strapping on some hauls
Strapping on every 3. haul
Hull mounted transducers
Keel mounted transducers Johan Hjort
1995
Variable use of trawl sensors
Trawl manual specifying use of sensors
Strapping on every 3. haul
Strapping on every 2. haul
2 research vessels, 1 commercial trawler
3 research vessels
1996
2 strata systems and 63 strata, 20/30/40 nm distance
1 strata system and 23 strata, 16/24/32 nm distance
2 age samples per 5-cm group, 4 per stratum
1 age sample per 5-cm group, all stations with > 10 specimens (cod and haddock)
1997
16/24/32 nm distance
20 nm distance
Hull mounted transducers
Keel mounted transducers G.O. Sars
1998
Strapping on every 2. haul
Strapping on every haul
20 nm distance
20/30 nm distance
2000
3 Norwegian research vessels
2 Norwegian and 1 Russian research vessel
2002
20/30 nm distance station grid
16/20/24/32 nm distance station grid
2003
Height trawl sensor for opening and bottom contact
Trawl eye for opening and bottom contact
2004
Vaco trawl doors
V- doors G.O. Sars and Johan Hjort
EK 500
ER60 G.O. Sars
2005
EK 500
ER60 Johan Hjort and Russian vessels
2006
Standard Campelen rigging
“Tromsø rigging” on Norwegian vessels
2007
BEI
LSSS Norwegian vessels
2008
V trawl doors
Thyborøn doors Jan Mayen/Helmer Hanssen
2010
V trawl doors
Thyborøn doors G.O. Sars and Johan Hjort
2011
30 min. tow duration
15 min. tow duration
2014
1 strata system and 23 strata
1 strata system and 26 strata (extended area N)
2015
“Tromsø rigging” on Norwegian vessels
Standard Campelen rigging
2017
EK 60 on G.O. Sars
EK80 in EK 60 mode on G.O. Sars
2018
EK 60 on Johan Hjort
EK80 in EK 60 modus on Johan Hjort
Changes to estimation methods
Year
Change from
To
Time series revised
1989
Uniform gear handling
Correction for change from Bobbins gear to Rock-hopper gear for cod and haddock
x
1993
TS = 21.8 log L – 74.9 for cod and haddock
TS = 20 log L – 68 for all demersal species
x
Weighting of age-length keys by total catch
Weighting of ALK by swept area estimate
1995
Constant effective fishing width of the trawl
Fish size dependent effective fishing width (time series corrected)
x
2017
Swept area estimates by the Survey Program
Swept area and CV estimates by StoX software
x
2018
Acoustic estimates by the BEAM Program
Acoustic and CV estimates by StoX software
x
2020
Area N not included in standard time series
Area N included in haddock survey indices
x (haddock, area N presented separately for the other species)
2021
Area N not included in standard time series
Area N included in cod survey indices
x (cod, area N presented separately for b)
Appendix 4. Scientific participants 2023
Research vessel
Participants
“ Johan Hjort” (26.01-17.03)
Part 1 (26.01-01.02) J. Aanestad Godiksen (cruise leader) , E. Holm, L. Solbakken, I. E. Moksness, E. Odland, L. Doksæter Sivle, J. Nesheim, J. P. Meyer, O. Vigeland, S. Waardal Heum
Part 2 (01.02-24.02) E. Fuglebakk (cruise leader) , E. Holm, H. Mjanger, C. Eriksson Bjånes, V. Fauskanger, H. Haraldsen-Lien, M. Mjanger, S. Nygård Larsen
Part 3 (24.02-01.03) B. Mozfar, M. Ring Kleiven, V. Fauskanger, J. Nesheim, S. Nygård Larsen, I. Huse
Part 4 (01.03-17.03) A. Staby (cruise leader) , E. Boge, J. Skadal, E. Odland, A. Storaker, M. Olsen, V. Fauskanger, J. Nesheim, H. K. Eide
“ Kronprins Haakon” (05.02-01.03)
Part 1 (05.02-15.02) T. Wenneck (cruise leader) , S. Seim, M. Lie Skage, S. Gundersen, I. Huse, A. Storaker, F. Midtøy, H. K. Eide, A. Steinsland, R. Holger Robertsen
Part 2 (15.02-01.03) T. Wenneck (cruise leader) , L. Solbakken, I. E. Moksness, G. B. Thorsheim, H. Børsheim, H. Salvolainen, A. Steinsland, R. H. Robertsen
“ Vilnyus” (28.01-20.02)
A. Amelkin (cruise leader) , M. Rybakov, P. Krivosheya, A. Pronjuk, Y. Kalashnikov, D. Draganov, S. Harlin, R. Klepikovsky, M. Gubanishchev, A. Kanishchev, M. Kalashnikova, A. Bessonov, T. Mishin
Appendix 5. Annual survey reports 1981-2022
Dalen, J., Hylen, A. og Smedstad, O. M. 1981. Intern toktrapport unummerert. Havforskningsinstituttet.
Dalen, J., Hylen, A., Jakobsen, T., Nakken, O., Randa, K. and Smedstad, O. 1982. Norwegian investigations on young cod and haddock in the Barents Sea during the winter 1982. ICES CM 1982/G: 41, 20 pp.
Dalen, J., Hylen, A., Jakobsen, T., Nakken, O., Randa, K., and Smedstad, O. 1983. Preliminary report of the Norwegian investigations on young cod and haddock in the Barents Sea during the winter 1983. ICES CM 1983/G:15, 23 pp
Dalen, J., Hylen, A., Jakobsen, T., Nakken, O. and Randa, K. 1984. Preliminary report of the Norwegian Investigations on young cod and haddock in the Barents Sea during the winter 1984. ICES CM 1984/G:44, 26 pp.
Hylen, A., Jakobsen, T., Nakken, O. and Sunnanå, K. 1985. Preliminary report of the Norwegian Investigations on young cod and haddock in the Barents Sea during the winter 1985. ICES CM 1985/G:68, 28 pp.
Hylen, A., Jakobsen, T., Nakken, O., Nedreaas, K. and Sunnanå, K. 1986. Preliminary report of the Norwegian Investigations on young cod and haddock in the Barents Sea. ICES CM 1986/G:76, 25 pp.
Godø, O. R., Hylen, A., Jacobsen, J. A., Jakobsen, T., Mehl, S., Nedreaas, K. and Sunnanå, K. 1987. Estimates of stock size of Northeast Arctic cod and haddock from survey data 1986/1987. ICES CM 1987/G: 37.
Hylen, A., Jacobsen, J.A., Jakobsen, T., Mehl, S., Nedreaas, K. and Sunnanå, K. 1988. Estimates of stock size of Northeast Arctic cod and haddock, Sebastes mentella and Sebastes marinus from survey data, winter 1988. ICES CM 1988/G: 43.
Jakobsen, T., Mehl, S., Nakken, O., Nedreaas, K. and Sunnanå, S. 1989. Estimates of stock size of Northeast Arctic cod and haddock, Sebastes mentella and Sebastes marinus from survey data, winter 1989. ICES CM 1989/G: 42.
Jakobsen, T., Mehl, S. og Nedreaas, K. 1990. Kartlegging av mengde og utbredelse av torsk, hyse og uer i Barentshavet januar mars 1990. Intern toktrapport, Senter for marine ressurser, Havforskningsinstituttet, Bergen. Engelsk abstrakt, tabell og figurtekster. 29 s. (upubl.).
Hylen, A., Jakobsen, T., Mehl, S., og Nedreaas, K. 1991. Undersøkelser av torsk, hyse og uer i Barentshavet vinteren 1991. Intern toktrapport nr. 1 -1992, Senter for marine ressurser, Havforskningsinstituttet, Bergen. Engelsk abstrakt, tabell og figurtekster. 30 s. (upubl.).
Godø, O.R., Jakobsen, T., Mehl, S., Nedreaas, K. og Raknes, A. 1992. Undersøkelser av torsk, hyse og uer i Barentshavet vinteren 1992. Intern toktrapport 39/92, Senter for marine ressurser, Havforskningsinstituttet, Bergen. Engelsk abstrakt, tabell og figurtekster. 33 s. (upubl.).
Korsbrekke, K., Mehl, S., Nakken, O. and Nedreaas, K. 1993. Bunnfiskundersøkelser i Barentshavet vinteren 1993. Rapp. Senter Marine Ressurser nr. 14-1993. Engelsk abstrakt, tabell- og figurtekster. 47s. Havforskningsinstituttet, Bergen.
Mehl, S. og Nakken, O. 1994. Bunnfiskundersøkelser i Barentshavet vinteren 1994. Fisken Hav (6) 1994. 72 s. Havforskningsinstituttet, Bergen.
Korsbrekke, K., Mehl, S., Nakken, O. og Sunnanå, K. 1995. Bunnfiskundersøkelser i Barentshavet vinteren 1995. Fisken Hav (13) 1995. 86 s. Havforskningsinstituttet, Bergen.
Mehl, S. og Nakken, O. 1996. Botnfiskundersøkingar i Barentshavet vinteren 1996. Fisken Hav (11) 1996. 68 s. Havforskingsinstituttet, Bergen.
Mehl, S. 1997. Botnfiskundersøkingar i Barentshavet (norsk sone) vinteren 1997. Fisken Hav (11) 1997. 72 s. Havforskingsinstituttet, Bergen.
Mehl, S. 1998. Botnfiskundersøkingar i Barentshavet (redusert område) vinteren 1998. Fisken Hav (7) 1998. 69 s. Havforskingsinstituttet, Bergen.
Mehl, S. 1999. Botnfiskundersøkingar i Barentshavet vinteren 1999. Fisken Hav (13) 1999. 70 s. Havforskingsinstituttet, Bergen.
Aglen, A., Drevetnyak, K., Jakobsen, T., Korsbrekke, K., Lepesevich, Y., Mehl, S., Nakken, O. and Nedreaas, K. 2001. Investigations on demersal fish in the Barents Sea winter 2000. Detailed report. IMR-PINRO Joint Report Series no. 5, 2001. 74 pp.
Aglen, A., Alvsvåg, J, Korsbrekke, K., Lepesevich, Y., Mehl, S., Nedreaas, K., Sokolov, K. and Ågotnes, P. 2002. Investigations on demersal fish in the Barents Sea winter 2001. Detailed report. IMR-PINRO Joint Report Series no. 2 2002, 66 pp.
Aglen, A., Alvsvåg, J., Drevetnyak, K, Høines, Å., Korsbrekke, K., Mehl, S., and Sokolov, K. 2002. Investigations on demersal fish in the Barents Sea winter 2002. Detailed report. IMR/PINRO Joint report series no 6, 2002. 63 pp.
Aglen, A., Alvsvåg, J., Halland, T.I., Høines, Å., Nakken, O., Russkikh, A., and., Smirnov, O. 2003. Investigations on demersal fish in the Barents Sea winter 2003. Detailed report. IMR/PINRO Joint report series no 1, 2003. 56pp.
Aglen, A., Alvsvåg, J., Høines, Å., Korsbrekke, K., Smirnov, O., and Zhukova, N., 2004. Investigations on demersal fish in the Barents Sea winter 2004. Detailed report. IMR/PINRO Joint report series no 5/2004, ISSN 1502-8828. 58pp.
Aglen, A., Alvsvåg, J., Grekov, A., Høines, Å., Mehl, S., and Zhukova, N. 2005. Investigations of demersal fish in the Barents Sea winter 2005. IMR/PINRO Joint Report Series, No 4/2005. ISSN 1502-8828, 58 pp.
Aglen, A., Alvsvåg, J., Høines, Å., Johannesen, E. and Mehl, S. 2008. Investigations on demersal fish in the Barents Sea winter 2006. Detailed report. Fisken Hav13 (2008). 49 pp.
Aglen, A. 2007. Report from demersal fish survey in the Barents Sea February-March 2007. WD #8 ICES Arctic Fisheries Working Group, Vigo, Spain 19-28 April 2007.
Aglen, A., Høines, Å., Mehl, S., Prozorkevich, D., Smirnov, O. and Wenneck, T. de L. 2008. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 25 January – 14 March 2008. WD #16 ICES Arctic Fisheries Working Group, ICES Headquarters 21-29 April 2008.
Aglen, A., Alexandrov, D., Høines, Å., Mehl, S., Prozorkevich, D. and Wenneck, T. de L. 2009. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 1 February – 15 March 2009. WD #11 ICES Arctic Fisheries Working Group, San-Sebastian, Spain 21-27 April 2007.
Aglen, A., Alexandrov, D., Gjøsæter, H., Johannesen, E., Mehl, S. and Wenneck, T. de L. 2010. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 1 February – 17 March 2010. WD #15 ICES Arctic Fisheries Working Group, Lisbon, Portugal/Bergen, Norway 22-28 April 2010.
Aglen, A., Alexandrov, D., Gjøsæter, H., Johannesen, E. and Mehl, S. 2011. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 1 February – 14 March 2011. WD #3 ICES Arctic Fisheries Working Group, Hamburg, Germany 28 April - 4 May 2011.
Aglen, A., Dingsør, G., Mehl, S., Murashko, P. and Wenneck, T. de L. 2012. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 21 January – 15 March 2012. WD #3 ICES Arctic Fisheries Working Group, Copenhagen, Denmark 20-26 April 2012.
Mehl, S., Aglen, A., Alexandrov, D.I., Bogstad, B., Dingsør, G.E., Gjøsæter, H., Johannesen, E., Korsbrekke, K., Murashko, P.A., Prozorkevich, D.V., Smirnov, O.V., Staby, A., and Wenneck, T. de Lange, 2013. Fish investigations in the Barents Sea winter 2007-2012. IMR/PINRO Joint Report Series 1-2013, 97 pp.
Aglen, A., Dingsør, G., Godiksen, J., Gjøsæter, H., Johannesen, E. and Murashko, P. 2013. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 1 February – 13 March 2013. WD #3 ICES Arctic Fisheries Working Group, Copenhagen, Denmark 18-24 April 2013.
Aglen, A., Godiksen, J., Gjøsæter, H., Mehl, S., Russkikh, A. and Wenneck, T. de L. 2014. Results from the Joint IMR-PINRO Barents Sea demersal fish survey 22 January – 8 March 2014. WD #3 ICES Arctic Fisheries Working Group, Lisbon, Portugal 23-29 April 2014.
Mehl, S., Aglen, A., Bogstad, B., Dingsør, G.E., Gjøsæter, H., Godiksen, J., Johannesen, E., Korsbrekke, K., Murashko, P.A., Russkikh, A.A, Staby, A., Wenneck, T. de Lange, Wienerroither, R. 2014. Fish investigations in the Barents Sea winter 2013-2014. IMR/PINRO Joint Report Series 2014(2), 73 pp. ISSN 1502-8828.
Mehl, S. Aglen, A., Amelkin, A., Dingsør, G.E., Gjøsæter, H., Godiksen, Staby, A., Wenneck, T. de Lange, Wienerroither. 2015. Fish investigations in the Barents Sea, winter 2015. IMR-PINRO report series 2-2015. 61 pp.
Mehl, S., Aglen, A., Amelkin, A.V., Bogstad, B., Dingsør, G., Korsbrekke, K., Olsen, E., Russkikh, A.A., Staby, A., Wenneck, T. de Lange and Wienerroither, R. 2016. Fish investigations in the Barents Sea winter 2016. IMR/PINRO Joint Report Series 2016-4, 76pp.
Mehl, S., Aglen, A., Bogstad, B., Russkikh, A.A., Staby, A., Wenneck, T. de Lange and Wienerroither, R. 2017. Fish investigations in the Barents Sea winter 2017. IMR/PINRO Joint Report Series 2017-3, 87pp.
Mehl, S., Aglen, A., Gjøsæter, H., Godiksen, J. A., Russkikh, A.A., Staby, A., Tretyakov, I., Wenneck, T. de Lange and Wienerroither, R. 2018. Fish investigations in the Barents Sea winter 2018. IMR/PINRO Joint Report Series 2018-1, 82pp.
Mehl, S., Wenneck, T. de Lange, Aglen, A., Fuglebakk, E., Gjøsæter, H., Godiksen, J. A., Seim, S., Staby, A., Bogstad, B., Russkikh, A. and Fomin, K. 2019. Fish investigations in the Barents Sea winter 2019. IMR/PINRO Joint Report Series: 4-2019, 84pp.
Fall, J., de Lange Wenneck, T., Bogstad, B., Fuglebakk, E., Gjøsæter, H., Seim, S. E., Skage, M. L., Staby, A., Tranang, C. A., Windsland, K., Russkikh, A. A., Fomin, K. 2020. Fish investigations in the Barents Sea winter 2020. IMR/PINRO Joint Report Series: 2-2020, 98 pp.
Fall, J., de Lange Wenneck, T., Bogstad, B., Fuglebakk, E., Godiksen, J. A., Korsbrekke, K., Seim, S. E., Skage, M. L., Staby, A., Tranang, C. A., Windsland, K., Russkikh, A. A., Fomin, K. 2021. Fish investigations in the Barents Sea winter 2021. IMR/PINRO Joint Report Series: 1-2022, 100 pp.
Fall, J., de Lange Wenneck, T., Bogstad, B., Fuglebakk, E., Godiksen, J. A., Høines, Å., Korsbrekke, K., Skage, M. L., Staby, A., Tranang, C. A., Windsland, K., Russkikh, A. A., Kharlin, S. 2022. Fish investigations in the Barents Sea winter 2022. IMR/PINRO Joint Report Series: 1-2023, 93 pp