Determination of risk factors for herpesvirus outbreak in oysters using a broad-scale spatial epidemiology framework

• Published in: Scientific Reports
• Main Authors: Pernet, Fabrice, Fuhrmann, Marine, Petton, Bruno, Mazurie, Joseph, Bouget, Jean-Francois, Fleury, Elodie, Daigle, Gaetan, Gernez, Pierre
• Other Authors: Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire Environnement Ressources Morbihan Pays de Loire (LERMPL), Unité Littoral (LITTORAL), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Département de mathématiques et de statistique Laval-Québec (DMS), Faculté des sciences et de génie Laval-Québec (FSG), Université Laval Québec (ULaval)-Université Laval Québec (ULaval), Mer, molécules et santé EA 2160 (MMS), Le Mans Université (UM)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences Pharmaceutiques et Biologiques, Université de Nantes (UN)-Université de Nantes (UN), ANR-12-AGRO-0001,GIGASSAT,Adaptation des écosystèmes ostréicoles au changement global(2012)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: ACL; dynamics; aquaculture; stability; disease-induced mortality; crassostrea-gigas; oshv-1; bivalves; infectious-diseases; ostreid herpesvirus-1; spread; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://hal.science/hal-02640328; https://hal.science/hal-02640328/document; https://hal.science/hal-02640328/file/Pernet_etal_SR_2018.pdf; https://doi.org/10.1038/s41598-018-29238-4

WOS:000439026000030 International audience Marine diseases have major impacts on ecosystems and economic consequences for aquaculture and fisheries. Understanding origin, spread and risk factors of disease is crucial for management, but data in the ocean are limited compared to the terrestrial environment. Here we investigated how the marine environment drives the spread of viral disease outbreak affecting The Pacific oyster worldwide by using a spatial epidemiology framework. We collected environmental and oyster health data at 46 sites spread over an area of 300 km(2) along an inshore-offshore gradient during an epizootic event and conducted risk analysis. We found that disease broke out in the intertidal farming area and spread seaward. Mortalities and virus detection were observed in oysters placed 2 km from the farming areas, but oysters of almost all sites were subclinically infected. Increasing food quantity and quality, growth rate and energy reserves of oyster were associated with a lower risk of mortality offshore whereas increasing turbidity, a proxy of the concentration of suspended particulate matter, and terrestrial inputs, inferred from fatty acid composition of oysters, were associated with a higher risk of mortality. Offshore farming and maintenance of good ecological status of coastal waters are options to limit disease risk in oysters.