Farmer monitoring reveals the effect of tidal height on mortality risk of oysters during a herpesvirus outbreak

• Published in: ICES Journal of Marine Science
• Main Authors: Pernet, Fabrice, Gachelin, Sonia, Stanisiere, Jean-Yves, Petton, Bruno, Fleury, Elodie, Mazurié, Joseph
• 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), ANR-12-AGRO-0001,GIGASSAT,Adaptation des écosystèmes ostréicoles au changement global(2012)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: ACL; OsHV-1; management; aquaculture; husbandry practices; mu-var; water temperature; pacific oysters; infectious-diseases; ostreid herpesvirus-1; citizen science; crassostrea-gigas spat; eastern oyster; marine epidemiology and health; resistance; risk analysis; [SDV.BA.MVSA]Life Sciences [q-bio]/Animal biology/Veterinary medicine and animal Health; [SDV.SA.ZOO]Life Sciences [q-bio]/Agricultural sciences/Zootechny; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://hal.science/hal-02874968; https://hal.science/hal-02874968/document; https://hal.science/hal-02874968/file/Pernet_etal_ICES-JoMS_2019.pdf; https://doi.org/10.1093/icesjms/fsz074

WOS:000501732500038 International audience The intertidal zone is characterized by a sharp vertical gradient of environmental stress, which structures species distribution and their interactions. Few studies, however, have examined the influence of tidal height on host-pathogen interactions. Here, we investigated how the tidal height influence outbreak of the Ostreid herpesvirus type 1 (OsHV-1) affecting the Pacific oyster. A volunteer network composed of 20 oyster growers monitored the survival of 28 batches of oysters during an epizootic event in Southern Brittany, France. Oysters were spat from wild collection or hatchery production. The sampling sites were spread over a 150-km(2) area with a tidal height ranging from 0.98 to 2.90 m. Concomitantly, we followed survival of oyster spats in relation with OsHV-1 DNA detection at two sites and conducted risk analysis. We found that tidal height was associated with a lower risk of mortality. This effect was higher for hatchery than for wild oysters probably reflecting differences in health status. Our study opens perspectives for mitigation strategies based on tidal height and emphasizes the value of volunteer science in marine epidemiological studies.