Reidar Toresen

Telefon: 95795468

Forskningssjef for gruppen; Havforskning i Utviklingsland

Toktleder på "Dr. Fridtjof Nansen" i Vest Sahara, november 2019

Forsker på hva som påvirker variasjoner i rekruttering til norsk vårgytende sild 




Tar toktleder jobber på Dr. Fridtjof Nansen.  Skal mengdemåle mengde pelagisk fisk utenfor Vest-Sahara i oktober-novembere 2019 

Jobber mye med bruken av data fra Nansen.  Assessment av pelagisk fisk, og utvikling av artikler på data fra toktene.

Jobber med rekrutteringsmekanismer for Norsk vårgytende sild.

Curriculum Vitae

I am currently involved in surveys and assessments of pelagic fish in developing countries. Mainly abundance estimation of pelagic fish by the use of the echo sounding methodology applied in research vessels.  I am also participating in working groups doing assessments of the status and development of fish resources in Africa, and I am giving advice on how these assessments can be used as a basis for fish resources management.

Participate in various surveys onboard Dr Fridtjof Nansen, -  the next one will be a survey of the pelagic fish resources off West-Sahara in October-November 2019

Person data:

Name: Reidar Toresen Age: 65

1982 —  Master degree (Cand. real.)  in Fisheries biology, University of Bergen.
Title of thesis; Predation on the eggs of Norwegain spring-spawning herring (Clupea harengus Linne) at a spawning ground, Buagrunnen, at Møre in 1980 and 1981.

2002  — PhD (Dr. philos) in fishery biology,  University of Bergen. Title of thesis: "Environmental influence on herring (Clupea harengus L.) abundance" "An  environmental approach for the understanding of herring stock fluctuations and its application in management".


Current position:

Head of Reserach Group, Centre for Development Cooperation in Fisheries,
Institute of Marine Research, Bergen, Norway

Employed as:

Scientist with the Institute of Marine Research, Pelagic Fish Department, 1983-2003.

In the period 1992 until 2003, partly employed at the department dealing with assessment of fish resources in developing countries, and worked in projects in several countries in Asia and Africa.

In  2002 - 2003, deputy head of Department of Pelagic Fish at IMR, Bergen.

2004 - 2007, Head of research Group, Fish Stocks and Ecosystems, Norwegian Sea and North Sea, IMR.

2007 – 2013, Research director with responsibility of research strategy at IMR.

2013 - 2017, Scientist and Advisor at Centre for Development Cooperation in Fisheries, CDCF, IMR

2017 -           Head of Research group, Marine Research in Developing Countries


Experience and fields of competence:
• Acoustic abundance estimation and assessment of pelagic fish.  Experience in this field in north east Atlantic, fjords and in developing countries.
• National responsibility for herring in the North Sea, 1992-2004. This implies being in charge of the research, abundance estimation, assessment and advice for management of the fish stock.

• Head of the ICES, Herring Assessment Working Group for the Area South of 62oN (1994-1997).

• Head of the FAO working group for assessment of pelagic fish off NW Africa (2001 - 2006 ).

• Norwegian member in ICES' Advisory Committee on Fishery Management (2003 2007).

• Norwegian member in ICES’ Advisory Committee,  2007 - .

• Head of the Scientific Committee of  the South East Atlantic Fishery Organization (SEAFO) (2005-2007)

• Norwegian member of the Permanent Committee for Management and Science in NEAFC. (PECMAS)(2006-2008).

• Advisor for Norwegian managers concerning fishery negotiations between Norway and EU on fish quotas in the North Sea, 1992-1997. Has also been advisor for Norwegian managers concerning negotiations on fish quotas of Blue whiting and Norwegian spring-spawning herring.

• Have participated on several missions for abundance estimation, assessments and advising for management of pelagic fish stocks in Namibia, Angola, Senegal, Mauritania, China and Vietnam.

• Research in the following fields:

Long term fluctuations of Norwegian spring spawning herring and the environmental influence on fish stock fluctuations.

Growth and maturation of herring.

Sources of error in acoustic abundance estimation of herring.
Recruitment mechanisms and ecological interactions between fish stocks.


Participation in ICES expert groups:

• The Atlanto-scandian  herring and capelin working group, 1983-1986
• The Methods Working Group 1991
• Blue whiting assessment working group 1992
• The Herring Assessment Working Group for the area south of 62, 1993- present
• (Chairman 1995-1997).
• The Northern Pelagic Assessment Working Group, 2004.

Participation in other groups:

• The FAO Working Group on the Assessment of Small Pelagic Fish off North West
Africa, (Chairman 2001 - 2006)


Participation in advisory committees:

•   ACFM, 2003 - 2007
•  ACOM, 2007 -
•  CECAF 2002 - 2004
•  SEAFO Scientific Committee 2005  -  2007
•  PECMAS 2006 - 2008


Faglige foredrag


Langsiktighet i fiskerirådgiving, pelagisk fisk

Toresen, Reidar

Utfordringer for fiskerirådgivingen, - er vi solide nok?

Toresen, Reidar

Har vi tilstrekkelig kunnskap for en framtidig god marin ressursforvaltning?

Toresen, Reidar

Spawning stock fluctuations and recruitment variability related to temperature for selected herring (Clupea harengus) stocks in the North Atlantic

Toresen, Reidar

The effects of a minimum landing size regulation in the fishery of Norwegian spring-spawning herring

Johannes Hamre, Reidar Toresen

Recruitment indices of Norwegian spring-spawning herring for the period 1965-1984 based on the international 0-group fish surveys

Toresen, Reidar

Vitenskapelige artikler (NVI)


Mesopelagic fish composition and diets of three myctophid species with potential incidence of microplastics, across the southern tropical gyre

Ainhoa Bernal, Reidar Toresen, Rodrigo Riera
Deep-sea research. Part II, Topical studies in oceanography

Sudden change in long-term ocean climate fluctuations corresponds with ecosystem alterations and reduced recruitment in Norwegian spring-spawning herring (Clupea harengus, Clupeidae)

Reidar Toresen, Hein Rune Skjoldal, Frode Bendiksen Vikebø, Monica Bente Martinussen
Fish and Fisheries 20 p. 686-696

Observational insights into chlorophyll distributions of subtropical South Indian Ocean eddies

Francois Dufois, Nick J. Hardman-Mountford, Michelle Fernandes, Bozena Wojtasiewicz, Damodar Shenoy, Dirk Slawinski, Mangesh Gauns, Jim Greenwood, Reidar Toresen
Geophysical Research Letters 44 p. 3255-3264

Atlantic Salmon (Salmo salar): The "Super-Chicken" of the Sea?

Ole Torrissen, Rolf Erik Olsen, Reidar Toresen, Gro Ingunn Hemre, Albert G. J. Tacon, Frank Asche, Ronald W. Hardy, Santosh P. Lall
Reviews in fisheries science 19 p. 257-278

A major increase in snake pipefish (Entelurus aequoreus) in northern European seas since 2003: potential implications for seabird breeding success.

mike harris, Doug Beare, Reidar Toresen, Leif Nøttestad, Sarah Wanless
Marine Biology 151 p. 973-983

Factors affecting the recruitment variability of the Norwegian spring-spawning herring (Clupea harengus L.)

Roald Sætre, Reidar Toresen, Tycho Anker-Nilssen
ICES Journal of Marine Science 59 p. 725-736

The Norwegian spring-spawning herring - spawning, larval drift and larval retention

Roald Sætre, Reidar Toresen, Henrik Søiland, Petter Fossum
Sarsia 87 p. 167-178

Fisheries management in a sea of uncertainty: the role and responsibility of scientists in attaining a precautionary approach

Lene Buhl-Mortensen, Reidar Toresen
International Journal of Sustainable Development 4 p. 245-264

Juvenile herring prey on Barents Sea capelin larvae

Geir Huse, Reidar Toresen
Sarsia 85 p. 385-391

Exploitation and management of Norwegian spring-spawning herring in the 20th century

Reidar Toresen, Jakob Jakobsson
ICES Marine Science Symposia 215 p. 558-571

Stock structure of Norwegian spring-spawning herring, - historical background and recent apprehension

Reidar Toresen, Ole Johan Østvedt
ICES Marine Science Symposia 215 p. 532-543

Variation in abundance of Norwegian spring-spawning herring (Clupea harengus, Clupeidae) throughout the 20th century and the influence of climatic fluctuations

Reidar Toresen, Ole Johan Østvedt
Fish and Fisheries 1 p. 231-256

The acoustic method as used in the abundance estimation of capelin (Mallotus villosus Muller) and herring (Clupea harengus Linne) in the Barents Sea

Reidar Toresen, Harald Gjøsæter, Pedro Conte de Barros
Fisheries Research 34 p. 27-37

Relevance of cod (Gadus morhua L.) predation for inter-cohort variability in mortality of juvenile Norwegian spring-spawning herring (Clupea harengus L.)

Pedro Conte de Barros, Mumtaz Tirasin, Reidar Toresen
ICES Journal of Marine Science 55 p. 454-466

The acoustic method as used in the abundance estimation of capelin (Mallotus villosus Muller) and herring (Clupea harengus Linne) in the Barents Sea

Reidar Toresen, Harald Gjøsæter, Pedro de Barros
Fisheries Research 34 p. 27-37

A comparative study of the feeding habits of herring (Clupea harengus, Clupeidae, L.) and capelin (Mallotus villosus, osmeridae, Muller) in the Barents Sea

Geir Huse, Reidar Toresen
Sarsia 81 p. 143-153

Stock size, distribution and biology of anchovy in the Yellow Sea and East China Sea

Svein Arnholt Iversen, Deshan Zhu, Arne Johannessen, Reidar Toresen
Fisheries Research 16 p. 147-163

Determining the extinction cross section of aggregating fish

Kenneth Foote, Egil Ona, Reidar Toresen
Journal of the Acoustical Society of America 91 p. 1983-1990

Predation on the eggs of Norwegian spring-spawning herring (Clupea harengus L.) on a spawning ground on the west coast of Norway

Toresen, Reidar
ICES Journal of Marine Science 48 p. 15-21

Absorption of acoustic energy in dense herring schools studied by the attenuation in the bottom echo signal

Toresen, Reidar
Fisheries Research 10 p. 317-327

Long-term changes in growth of Norwegian spring-spawning herring

Toresen, Reidar
ICES Journal of Marine Science 47 p. 48-56

Rapporter og avhandlinger


Assessment of commitments on sustainable fisheries to the Our Ocean conferences : Where are we now?

Geir Huse, Harald Loeng, Åsmund Bjordal, Reidar Toresen, Kari Østervold Toft

Survey of the southern Indian Ocean. Jakarta to Port Louis, IOS leg 1. 26. June - 16. Juny 2015.

Reidar Toresen, Bernerd M Fulanda, Francois Dufois, Melody Puckridge, Michelle Fernandes, Ainoha Bernal Bajo, Espen Bagøien, Riaan Cedras, Pazi Semili, Indah Lutfiyati, Andria Ansri Utama, X Nasirin, Patsy Theresine, Aina Le Don Nomenisoa, Kristine Nilsen Torkildsen, Alexander Christian Beck

Survey of the mesopelagic fish and environment in the Bay of Bengal

Reidar Toresen, Thor A. Klevjer, K. Arulananthan, Diana Zaera-Perez

Havets Ressurser og Miljø 2006

Svein Arnholt Iversen, Petter Fossum, Harald Gjøsæter, Morten D. Skogen, Reidar Toresen

Rapport fra metodetokt med F/F Eldjarn januar 1988

Egil Ona, Reidar Toresen, Harald Gjøsæter

Rapport fra tokt med F/F Eldjarn april-mai 1986

Harald Gjøsæter, Reidar Toresen
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