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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 sea- sonal 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 sen- sitivity 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.

aquatic living resources

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

Assessing the impact of different management options using ISIS-Fish: the FrenchMerluccius merluccius–Nephrops norvegicusmixed fishery of the Bay of Biscay