Achieving sustainable fisheries: gradually or abruptly?

摘要: A key issue in fisheries restoration is the speed at which recovery can occur, while still meeting economic and social constraints managers must deal with. This paper uses viable control approach to examine study tradeoffs involved with selection of strategies. We define sustainability as a combination biological, need be met for fishery exist. The set states are met, or states, considered target fishery. analysis based on discrete time bioeconomic model Bay Biscay nephrops fishery, stock biomass fleet size two state variables, per vessel fishing effort adjustment variables. address particular optimal problem minimizing required recover from unsustainable under minimum transition-profit constraint corresponding maintain level revenue vessels during transition phase. apply this framework historical crisis situation case study, analyze various paths different profit constraints, including path followed by