Development and application of a machine-learning and geocomputation workflow for assessing the gear effort of gillnetters operating in the Bay of Biscay ...
Since 2016, strandings of small cetaceans showing signs of capture have reached significant levels, which could question the viability of the North Atlantic common dolphin population (ICES 2022). It is against this backdrop that CNRS and Ifremer, in conjunction with the OFB, have co-constructed the...
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| Format: | Book |
| Language: | unknown |
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Ifremer
2023
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| Online Access: | https://dx.doi.org/10.13155/97561 https://archimer.ifremer.fr/doc/00864/97561/ |
| Summary: | Since 2016, strandings of small cetaceans showing signs of capture have reached significant levels, which could question the viability of the North Atlantic common dolphin population (ICES 2022). It is against this backdrop that CNRS and Ifremer, in conjunction with the OFB, have co-constructed the Delmoges program (Delphinus Mouvement Gestion), which is developing a multidisciplinary scientific approach aimed at gaining a better understanding of the mechanisms involved in the accidental capture of dolphins. In particular, developments are being proposed to provide a more detailed description of the activities of fishing fleets deemed to be most at risk of bycatching cetaceans. The qualification of fishing routes is currently based on simple decision rules using speed thresholds, so this study focuses on other qualification methods that have proved highly effective in other work: machine learning. Using the qualified positions and fishing operations of the 20 gillnetters in the OBSCAME database as a training ... : Depuis 2016, les échouages de petits cétacés présentant des traces de capture ont atteint des niveaux importants, qui pourraient remettre en question la viabilité de la population de dauphins communs de l'Atlantique Nord (ICES 2022). C'est dans ce contexte que le CNRS et Ifremer en concertation avec l'OFB ont co-construit le programme Delmoges (Delphinus Mouvement Gestion) qui développe une approche scientifique multidisciplinaire visant à une meilleure compréhension des mécanismes de captures accidentelles de dauphins. Des développements sont notamment proposés pour décrire plus finement l’activité des flottilles de pêche pour lequel le risque de capture accidentelle de cétacés est le plus élevé. La qualification des trajets de pêche est basée à l’heure actuelle sur des règles de décision simples utilisant des seuils de vitesse, cette étude se concentre donc sur d’autres méthodes de qualification qui se sont révélées très efficace pour d'autre travaux : l'apprentissage statistique. En utilisant comme jeu ... |
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