The influence of changes in the selectivity of fishing on the stock dynamics of the Norwegian-Barents Sea beaked redfish (Sebastes mentella)
2020
Filin, A.A.
The results of a comparative analysis of catches size composition of the Norwegian-Barents Sea beaked redfish by fishing and research vessels in 1960–2019, as well as a model evaluation of its stock dynamics under different scenarios of fishing selectivity are presented. It is shown that the intensive and unregulated fishing of the beaked redfish in the 60–70’s of the last century led to a sharp increase of relative portion of young individuals in the stock. The management measures that were taken later on limitation of bycatch of small fish, along with decrease of fishing, facilitated to the recovery of both stock biomass and its size structure. In the model, a change of fishery selectivity by increasing removal of large individuals lead to a growth of stock size, but a decrease of the catches. According to the model estimates, a resistance of the Norwegian-Barents Sea beaked redfish to a fishery pressure should increase with a shift in the fishery selectivity towards the older individuals
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