Simulation of the effect of using selectivity devices in the hake and outrigger trawler fleets on hake (Merluccius hubbsi) south of 41° S
Keywords:Hake, by-catch, selectivity, access, catches
The shrimp (Pleoticus muelleri) fishery is developed in the breeding area of the hake (Merluccius hubbsi) patagonian stock. In order to propose a management measure that considers exploitation of the lesser impact on the hake resource, simulations were performed to estimate the Biologically Acceptable Catch (CBA) in said fishery and as by-catch in that of shrimp. To reduce hake juveniles by-catch different selective devices designed for each fishery were simulated. In the first place, mortality per age group that would produce the fleets equipped with such fishing gear was estimated; then, projections on the population state to calculate hake CBA for 2011 were carried out. As a result, several scenarios to obtain the low risk catch that would allow to meet the objective of recovering the reproductive biomass at 400,000 and 500,000 t in the short (3 years) and mid term (7 years) were obtained. Scenario a) if the fishing effort in the hake fishery is maintained, even if by-catch decreased, the low risk catch would not be obtained; b) if by-catch level is maintained, in the hake fishery catches should be reduced; c) both fisheries should reduce hake catches; d) if only one selective gear (DEJUPA) in the hake fishery is used, catches would initially decrease to increase in the short term; e) case Hargril and f) case Disela II: if the fishing gear is changed only in the hake fishery, catches in said fishery would first diminish to be, in the short term, similar or larger than in the previous case; g) and h) if selective gears are used in both fisheries, a significant increase in catches would occur due to the decrease of biological risk that results from the reduction of juvenile mortality.
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Copyright (c) 2014 Fernanda Villarino, Betina Santos
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