Umr Marbec

Le 10/06/2021, à 13h45 : "Farmed bivalve loss due to seabream predation in the French Mediterranean Prévost Lagoon"


> JEUDI 10 JUIN 2021, 13h45 \ 14h30, Marion Richard et Jérôme Bourjea Ifremer, MARBEC Sète.

Vidéo de la présentation :
Chercheuse en écologie marine, spécialiste des interactions conchyliculture/environnement, je profiterai de ce séminaire pour vous présenter notre dernière étude portant sur l’impact de la prédation des daurades sur les stocks de coquillages en élevage dans la lagune du Prévost. Pour plus de détails, vous trouverez ci-dessous le résumé et la référence de l’article publié dans le journal Aquaculture Environnement Interactions.

Bivalve predation by seabream has been observed worldwide and is a major concern for bivalve farmers. Farmed bivalve-seabream interactions must be better understood to ensure the sustainability of bivalve aquaculture. The objectives of this study were to characterize gilthead seabream Sparus aurata presence in a bivalve farm in Prévost Lagoon (Mediterranean Sea) using acoustic telemetry and to evaluate monthly losses of mussels Mytilus galloprovincialis and oysters Crassostrea gigas due to seabream predation over an 18 mo period inside the farm and at an unprotected experimental platform. Large (281 to 499 mm TL) seabream were more commonly detected in the bivalve farm than were small (200 to 280 mm TL) seabream. In contrast to small seabream, 90% of large seabream returned to and spent extended periods in the study area the following year, suggesting inter-annual site fidelity for large fish that used the bivalve farm as a feeding site. Signs of predation were observed on mussels and oysters throughout the year at the unprotected experimental platform. Farmers noted losses in the farm from April to September. Maximal losses (90 to 100%) were observed post-oyster ‘sticking’ and mussel socking. Despite the deployment of nets as mechanical protection to reduce predation, oyster losses represented 28% of the annual value of oysters sold while mussel losses were estimated at ca. 1%. These results suggest that bivalves must be protected by nets throughout the year to avoid predation, particularly post-handling. A collaboration between shellfish farmers and fishermen could be a sustainable solution for bivalve farming, by regularly fishing for seabream in farms, between tables and inside protective nets.

Résumé issu de : Richard M., Forget F., Mignucci A., Mortreux S., Le Gall P., Callier M., Weise A., McKindsey C. W., Bourjea J. (2020). Farmed bivalve loss due to seabream predation in the French Mediterranean Prevost Lagoon, 12: 529–540. 40. https://doi.org/10.3354/aei0038
Présentations disponibles sur :
https://umr-marbec.fr/category/seminaires-marbec/

contact
prochainement :
Carole Saout-Grit Directrice de Glazeo, bureau d’études et Conseil indépendant spécialisé en océanographie physique, Nantes "Océans connectés"
UMR MARBEC (IRD, Ifremer,Université de Montpellier, CNRS) ✆ 04 99 57 32 27 - 04 99 57 32 90 - 04 67 14 36 72 www.umr-marbec.fr


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