Bycatch of juvenile fish in the shrimp fishery - management based on bioeconomic criteria
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The bycatch of juvenile fish can be a major problem in fisheries with small meshed trawls, such as fisheries for shrimp, (Pandalus borealis). A sorting grid that effectively removes most of the undersized fish has been developed for shrimp trawls and it is not legal to fish for shrimp in the Barents Sea without the use of this sorting grid. Apart from this, the existing catch-regulation of shrimp fishery in the Barents Sea is closing of shrimp fisheries on fishing-grounds, where the bycatch of juvenile fish exceeds the criteria for allowable bycatch in numbers per ton of shrimp set by The Notwegian- Russian Fishery Commission. In this paper a new method for calculation of a criteria for closing shrimp fisheries based on both biological and economic considerations is established. This bio-economic approach is an alternative to the existing biological approach. The main concept in the bio-economic approach is that if the expected future value of the bycatch exceeds the value of the shrimp catches, the shrimp fishery should be closed. In this paper a joint criteria for allowable bycatch is developed and calculated, including all the commercially interesting species, (cod; Gadus morhua, haddock; Melanogrammus aeglefinus, redfish; Sebastes mentella and Greenland halibut; Reinhardtius hippoglossoides) whose juveniles are caught as bycatch in the shrimp fisheries in the Barents Sea.