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Assessing the impact of different management options using ISIS-Fish: the French Merluccius merluccius – Nephrops norvegicus mixed fishery of the Bay of Biscay*

Published online by Cambridge University Press:  01 April 2006

Hilaire Drouineau ,
Stéphanie Mahévas ,
Dominique Pelletier  and
Benoît Beliaeff
Hilaire Drouineau
Affiliation:
IFREMER, Dép. Écologie et modèles pour l'halieutique, BP 21105, 44311 Nantes Cedex 03, France
Stéphanie Mahévas
Affiliation:
IFREMER, Dép. Écologie et modèles pour l'halieutique, BP 21105, 44311 Nantes Cedex 03, France
Dominique Pelletier
Affiliation:
IFREMER, Dép. Écologie et modèles pour l'halieutique, BP 21105, 44311 Nantes Cedex 03, France
Benoît Beliaeff
Affiliation:
IFREMER, Dép. Dynamiques de l'environnement côtier, BP 21105, 44311 Nantes Cedex 03, France
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Abstract

In this paper, we present an approach to compare the impact of different management options on the dynamics of a mixed fishery. We used ISIS-Fish, a simulation tool aimed at evaluating the impact of spatial and seasonal management measures on the dynamics of mixed fisheries. The French Nephrops norvegicus (Norway lobster) – Merluccius merluccius (hake) mixed fishery of the Bay of Biscay was chosen as a study case. First, we parameterised the population and exploitation models. We then selected several management measures, including marine protected areas (MPAs) and total allowable catches (TAC), and parameterised fishermen's reaction to each measure. Then, a sensitivity analysis was performed according to a fractional factorial experimental design. Management scenarios were assessed and compared using a statistical simulation design. The sensitivity analysis showed the large influence of some parameters, such as natural mortality, N. norvegicus fecundity, and catchability on both abundance and catches. Given model parameters, an improvement of trawl selectivity and several MPA designs (differing in size, seasonality and location) were found to result in a significant increase in abundance over 10 years, especially for N. norvegicus. This study illustrates the need for a pluri-specific approach to fisheries assessment and management.

Keywords

Fisheries dynamicsSpatial modelManagement measuresSensitivity analysisSimulation design
Type
Research Article
Information
Aquatic Living Resources , Volume 19 , Issue 1 , January 2006 , pp. 15 - 29
Copyright
© EDP Sciences, IFREMER, IRD, 2006

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Footnotes

*

http://www.ifremer.fr/isis-fish

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