Capacity management, not stock status or economics, drives fleet dynamics in the Bay of Biscay ecosystem on a decadal time scale

Marie-Joëlle Rochet (), Fabienne Daures () and Verena M. Trenkel ()
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Marie-Joëlle Rochet: EMH - Unité Écologie et Modèles pour l'Halieutique - IFREMER - Institut Français de Recherche pour l'Exploitation de la Mer
Fabienne Daures: 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
Verena M. Trenkel: EMH - Unité Écologie et Modèles pour l'Halieutique - IFREMER - Institut Français de Recherche pour l'Exploitation de la Mer

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Abstract: This paper introduces a semiqualitative approach to analyse the joint dynamics of fleets and stocks in a multispecies, multifleet fishery. We ask whether changes in fleets affect resource dynamics and whether trends in resource influence fleet dynamics more than external drivers do. External drivers include vessel buyback, fuel price, and fish prices, as well as environmental fluctuations. Resource status is measured by abundance and length metrics; fleet capacity is measured by total horse power, and economic metrics such as profitability and earnings are examined as well. A maximum likelihood approach is used to identify the combined metric trends with the largest support in the data. The approach is applied to the French Bay of Biscay fisheries in 2000-2007. Combined-metric time trends suggest that decreases in fleet capacity did not result in decreasing fishing impacts; trends in stocks and fish prices were not the major drivers of changes in fleets either. Rather, the vessel buyback program might have been the main factor determining fleet dynamics over that period.

Keywords: PERFORMANCE; INDICATORS; ENGRAULIS-ENCRASICOLUS FISHERY; POPULATION-DYNAMICS; TRAWL FISHERY; ISIS-FISH; IMPACT; COMMUNITIES; MODEL; SUSTAINABILITY (search for similar items in EconPapers)
Date: 2012-04-02
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Citations: View citations in EconPapers (3)

Published in Canadian Journal of Fisheries and Aquatic Sciences, 2012, 69 (4), pp.681-694. ⟨10.1139/f2012-002⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-00813329

DOI: 10.1139/f2012-002

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