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Master Thesis

Diagnostic de l'état de la pêcherie de Manche Orientale en intégrant la perception des pêcheurs

Abstract : The Eastern English Channel is subject to high anthropogenic pressure and concentrates a large multi- specific and multi-gear fishery. Despite the CFP initiating the implementation of several management plans, the catches are decreasing, especially flatfish such as sole. To reverse this current trend, the scientific advice aims at a multi-specific management plan within an ecosystem approach. In this context, studying fishermen’s perceptions could improve understanding the dynamics of exploited resources. This research aimed to assess the status of fisheries in the Eastern English Channel, considering fishermen’s perceptions and other quantitative methods. The present study was structured around three main axes: 1) Production-data analysis through the study of regime shifts; 2) Fishermen’s perceptions survey; 3) OSMOSE ecosystem modelling. The analysis of catches showed that 80% of the most exploited species had experienced a regime shift with a decrease in catches essentially over the 2007-2014 period and that there was often a time lag between the catch regime shift and the fishing effort regime shift. Surveying fishermen improved the understanding of their adaptation strategies to changing resources and showed that their perceptions are often consistent with the study of regime shifts (in space and time) but also with the OSMOSE simulations. Indeed, indirect interactions between flatfish were both mentioned by fishermen and predicted by the model. Simulations of different fishing scenarios with OSMOSE also allowed a better understanding of potential impacts from fishing activities on flatfish.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-03562540
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Submitted on : Wednesday, February 9, 2022 - 9:29:51 AM
Last modification on : Wednesday, April 6, 2022 - 4:08:08 PM
Long-term archiving on: : Tuesday, May 10, 2022 - 6:22:00 PM

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Nicolas Andrialovanirina. Diagnostic de l'état de la pêcherie de Manche Orientale en intégrant la perception des pêcheurs. Sciences du Vivant [q-bio]. 2021. ⟨dumas-03562540⟩

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