Can modelling the drift of bycaught dolphin stranded carcasses help identify involved fisheries? An exploratory study

Type Article
Date 2020-03
Language English
Author(s) Peltier Hélène1, 2, Dabin Willy1, Dars Cécile1, 2, Demaret Fabien1, 2, Doremus Ghislain1, Van Canneyt Olivier1, Laran Sophie1, 2, Mendez-Fernadez Paula1, 2, Spitz Jérôme1, Authier Matthieu1, 2, Delphine Pierre3, Ridoux Vincent1, 4
Affiliation(s) 1 : Observatoire Pelagis, UMS 3462- Université de La Rochelle-CNRS, 5 allées de l'océan, 17000, La Rochelle, France
2 : ADERA, 162 avenue Albert Schweitzer, CS 60040, 33608, Pessac Cedex, 33000, Pessac, France
3 : Météo-France, DirOP/MAR, 42 avenue Coriolis, 31057, Toulouse, Cedex, France
4 : Centre d’Etudes Biologiques de Chizé-La Rochelle, UMR 7372- Université de La Rochelle-CNRS, 2, rue Olympe de Gouges, 17000, La Rochelle, France
Source Global Ecology And Conservation (2351-9894) (Elsevier BV), 2020-03 , Vol. 21 , P. e00843 (19p.)
DOI 10.1016/j.gecco.2019.e00843
WOS© Times Cited 8
Keyword(s) Common dolphins, Strandings, Bycatch, Fishing effort, Reverse drift, Vessel monitoring system
Abstract

Between the 1st of February and the March 31, 2017, 793 stranded cetaceans were found along the French Atlantic coasts. Common dolphins made up 84% of these strandings, and most of these presented evidence of death in fishing gear. The aim of this work is to test an approach that could help identify the fisheries potentially involved in a given stranding event. To do this we examined how the distributions of likely areas of mortality of bycaught dolphins, inferred from carcass drift modelling, coincide with fishing effort statistics of various fleets, generated from the Vessel Monitoring System, in the area over the same dates. Using reverse drift modelling, two main mortality areas were identified. A total of 3690 common dolphins (IC95% [2230; 6900]) were estimated to have died in fishing gear within the Bay of Biscay during this unusual stranding event. There was a positive correlation between the origin of stranded bycaught dolphins and the fishing effort distribution of French midwater pair trawlers, Spanish otter bottom trawlers and French Danish seiners. This co-occurrence highlights a risk and identifies fisheries that require further investigation (through observers or e-monitoring). These fisheries differed in their fishing gear, but two characteristics appear to be shared: they targeted predatory fishes (sea bass and hake) in winter and used high vertical opening gear.

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Peltier Hélène, Dabin Willy, Dars Cécile, Demaret Fabien, Doremus Ghislain, Van Canneyt Olivier, Laran Sophie, Mendez-Fernadez Paula, Spitz Jérôme, Authier Matthieu, Delphine Pierre, Ridoux Vincent (2020). Can modelling the drift of bycaught dolphin stranded carcasses help identify involved fisheries? An exploratory study. Global Ecology And Conservation, 21, e00843 (19p.). Publisher's official version : https://doi.org/10.1016/j.gecco.2019.e00843 , Open Access version : https://archimer.ifremer.fr/doc/00592/70392/