Modeling marine shad distribution using data from french bycatch fishery surveys
Trancart, Thomas | Rochette, S | Acou, Anthony | Lasne, Emilien | Feunteun, Eric | Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) ; Université de Caen Normandie (UNICAEN) ; Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) | Unité Dynamiques des Écosystèmes Côtiers (DYNECO) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) ; Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) | French Ministry of Ecology and Sustainable Development
In the last few decades, there has been a marked decline in the number of shad (Alosa alosa and A. fallax) landed in France, which prompted the French committee of the International Union for Conservation of Nature to list shad as a 'Vulnerable' species in 2010. The freshwater phases of shad life cycles have been extensively studied, but the marine phases remain poorly understood. The present study aimed to provide new insights into shad ecology by describing the marine distributions of twaite and allis shad using a presence/absence model based on bycatch data from commercial fishery surveys. Depth and salinity were identified as the main factors influencing shad distribution. Both species were primarily located in shallow areas, at depths of between 0 and 100 m. As expected for anadromous species, low-salinity areas were preferred. Substrate and latitude played minor roles in the observed distribution of shad. Our results suggest that latitudinal migration between winter and summer habitats does not occur in twaite and allis shad populations. Furthermore, substrate does not appear to be a key factor contributing to shad distribution. A better understanding of the distribution of shad species throughout their life cycles, particularly in the open sea where they are vulnerable to bycatch, would help in the selection of key protected areas for the sustainability of shad populations.
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