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Distribution and abundance of Norwegian spring-spawning herring during the spawning season in 2021. Toktrapport nr. 1 - 2021


The objective of the NSSH spawning survey 2021 was to continue the time series of abundance estimates, both mean estimates and uncertainty in, for use in the ICES WGWIDE stock assessment. Moreover, other biological information about the surveyed spawning stock of Norwegian spring-spawning herring is also presented: spatial distribution of biomass and acoustic densities, total biomass and stock numbers with sample uncertainty, spatial patterns in age and maturity and geographical variations in temperature.