The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery?
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Data
2006
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The University of Chicago Press
Resumo
A discrete time, multi-gear, and age structured bio-economic model
is developed for the East Atlantic bluefin tuna fisheries, a paradigmatic example
of the difficulties faced in managing highly migratory fish stocks. The model is
used to analyse alternative management strategies for the Regional Fisheries
Management Organisation (RFMO) managing this fishery, and to investigate
some of the policy implications. For the various scenarios, the optimal stock
level varies between 500–800,000 tonnes, which compares with a stock level of
150,000 tonnes in 1995. In other words, there is a very strong case for rebuilding
the stock. Moreover, the sustainability of the stock is threatened unless a recovery
programme is implemented; indeed, the alternative may be stock collapse. Second,
to rebuild the stock, Draconian measures are called for: either outright moratoria
over fairly lengthy periods, or possibly a more gradual approach to steady
state given by a Total Allowable Catch (TAC) at a low level for an extended period
of time. Third, the cost of inefficient gear structure is very high indeed.
Descrição
Marine Resource Economics
Palavras-chave
ECONOMIC MODEL, MODELOS ECONÓMICOS, GESTÃO DE RECURSOS PESQUEIROS, FISHERIES RESOURCES MANAGEMENT, GESTÃO, MANAGEMENT, OTIMIZAÇÃO, OPTIMIZATION