Report of the Workshop on the Decline and Recovery of cod Stocks throughout the North Atlantic, including trophodynamic effects (WKDRCS) ...

• Main Author: ICES
• Format: Report
• Language: unknown
• Published: ICES Expert Group reports (until 2018) 2024
• Subjects: Fisheries and aquaculture; Ecosystem observation, processes and dynamics; Barents Sea; Greenland; atlantic cod; Gadus morhua; Iceland; North Atlantic
• Online Access: https://dx.doi.org/10.17895/ices.pub.22241041.v2; https://ices-library.figshare.com/articles/report/Report_of_the_Workshop_on_the_Decline_and_Recovery_of_cod_Stocks_throughout_the_North_Atlantic_including_trophodynamic_effects_WKDRCS_/22241041/2

Atlantic cod (Gadus morhua) stocks respond to long-term climate changes, such as the warming of the North Atlantic during the 1920s and 1930s, when cod increased rapidly in abundance off West Greenland and spread far to the north. At the same time there was increased recruitment at Iceland and increased abundance and northward expansion in the Barents Sea. By the time that the waters at West Greenland cooled in the late 1960s, the cod stock biomass had declined greatly from its peak in 1949. Both climate and the fishery contributed to the subsequent collapse of the stock, but it is not possible to make a quantitative attribution and the factors interact. In this and other cases the effective environmental factors include plankton production and other ecosystem effects. These factors often co-vary with temperature change, making it difficult to separate them from direct effects of temperature on growth, survival and recruitment. Cod have been subjected to changes in climate and fishing intensity for ...