Development of a spatial management strategy evaluation framework : application to the Bay of Biscay mixed demersal fisheries

• Main Author: Vigier, Audric
• Other Authors: Unité de recherche Sciences et Technologies Halieutiques (STH), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Écologie et Modèles pour l'Halieutique (IFREMER EMH), Institut Français de Recherche pour l'Exploitation de la Mer - Atlantique (IFREMER Atlantique), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Université de Bretagne occidentale - Brest, Michel Bertignac, Stéphanie Mahévas
• Format: Doctoral or Postdoctoral Thesis
• Language: French
• Published: HAL CCSD 2018
• Subjects: Hake; Bay of Biscay; Management strategy evaluation; ISIS-Fish; Stock synthesis; Merlu; Golfe de Gascogne; Evaluation de stratégies de gestion; [SDV.OT]Life Sciences [q-bio]/Other [q-bio.OT]; Norway; North East Atlantic
• Online Access: https://tel.archives-ouvertes.fr/tel-01886845; https://tel.archives-ouvertes.fr/tel-01886845/document; https://tel.archives-ouvertes.fr/tel-01886845/file/These-2018-SML-Halieutique-VIGIER_Audric.pdf

North-East Atlantic fisheries management goes towards a regionalisation, accounting for mixed fisheries technical interaction. Hence, understanding and assessing the spatio-temporal dynamics of exploited species and the fleets exploiting them is needed. This study aims to provide a tool to assess the effects of several management scenarii in the Bay of Biscay. lt fouses on North-east Atlantic northern hake stock (Merluccius merluccius) and the mixed demersal hake - sole (Solea solea) - Norway lobster (Nephrops norvegicus) Bay of Biscay fisheries.A Management Strategy Evaluation (MSE) framework has been developed, pairing a spatial northern hake stock assessment model, and an operating model (lSlS-Fish) simulating the Bay of Biscay mixed demersal fisheries.A Management Strategy Evaluation (MSE) framework has been developed, pairing a spatial northern hake stock assessment model, and an operating model (lSlS-Fish) simulating the Bay of Biscay mixed demersal fisheries.The spatial assessment model estimated northern hake abundance, recruitment and fishing mortality spatio-temporal variations, despite the estimation procedure sensitivity to initial point.The operating model incorporates all the current knowledge on the fisheries. lt has been calibrated following a multi-criteria approach, ensuring the reproduction of hake catch on 2010-2012. The Management Strategy Evaluation framework is not operational, although it highlighted discrepancies between both models dynamics at the fishery scale, and illustrated northern hake management through TACs potential effects on the fishery, in a landing obligation context. These results and improvement axes are discussed. La gestion des pêches en Atlantique Nord-Est s'oriente vers une régionalisation, prenant en compte les interactions techniques caractéristiques des pêcheries mixtes. Ceci nécessite une compréhension et une évaluation des dynamiques spatio-temporelles des espèces exploitées et des flottilles qui les exploitent. Cette thèse vise à proposer un outil pour évaluer ...