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Achieving sustainable Fisheries : gradually or abruptly?

Author

Listed:
  • Vincent Martinet

    (ECO-PUB - Economie Publique - INRA - Institut National de la Recherche Agronomique - AgroParisTech, EconomiX - EconomiX - UPN - Université Paris Nanterre - CNRS - Centre National de la Recherche Scientifique)

  • Olivier Thébaud

    (AMURE - Aménagement des Usages des Ressources et des Espaces marins et littoraux - Centre de droit et d'économie de la mer - IFREMER - Institut Français de Recherche pour l'Exploitation de la Mer - UBO - Université de Brest - IUEM - Institut Universitaire Européen de la Mer - IRD - Institut de Recherche pour le Développement - INSU - CNRS - Institut national des sciences de l'Univers - UBO - Université de Brest - CNRS - Centre National de la Recherche Scientifique - CNRS - Centre National de la Recherche Scientifique)

Abstract

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

Suggested Citation

  • Vincent Martinet & Olivier Thébaud, 2008. "Achieving sustainable Fisheries : gradually or abruptly?," Post-Print hal-00358342, HAL.
    • Handle: RePEc:hal:journl:hal-00358342
    as

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