Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs

摘要: A conceptual temperature dependent multispecies model for stock interactions and harvesting of herring, capelin cod in the Norwegian Sea-Barents Sea region has been developed. The concept presupposes that good recruitment herring is linked to warm ocean climate, which may occur with a frequency 8 10 years. Strong year classes overlap distribution larvae 3-4 years causing mass mortality fry, depletion stock. At same time about leave Barents Sea, lack food subsequent reduces potential yield cod. Immature main predator on mature cannibalism an important factor reducing abundance juvenile when rebuilding. used study effects different fishery management strategies stocks yield. Results show optimum obtained by high fishing immature from end period until spawning rebuilt. This strategy will result large fluctuation yearly catches but average biomass production catch These results are accordance history Prior 1970s, effort followed extent cod, resulting was abundant. varied 0.4 1.3 million tonnes, two periods 1950-1958 1959-1969 highest record. Moreover, trawlers fished small meshes end, discarding considerable quantities smallest fish. It concluded interaction between climate fish stocks, north east Atlantic region, fundamental importance dynamic processes govern region.