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Size-selective fishing gear and life history evolution in the Northeast Arctic cod ArchiMer
Jorgensen, Christian; Ernande, Bruno; Fiksen, Oyvind.
Industrial fishing has been identified as a cause for life history changes in many harvested stocks, mainly because of the intense fishing mortality and its size-selectivity. Because these changes are potentially evolutionary, we investigate evolutionarily stable life-histories and yield in an energy-allocation state-dependent model for Northeast Arctic cod Gadus morhua. We focus on the evolutionary effects of size-selective fishing because regulation of gear selectivity may be an efficient management tool. Trawling, which harvests fish above a certain size, leads to early maturation except when fishing is low and confined to mature fish. Gillnets, where small and large fish escape, lead to late maturation for low to moderate harvest rates, but when...
Tipo: Text Palavras-chave: Life history evolution; Fishing induced changes; Fisheries management; Evolutionary modeling; Energy allocation.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6867.pdf
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