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

Type Article
Date 2019-11
Language English
Author(s) Pernet FabriceORCID1, Gachelin Sonia2, Stanisière Jean-Yves3, Petton Bruno1, Fleury ElodieORCID1, Mazurié Joseph3
Affiliation(s) 1 : Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR 6539 UBO/CNRS/IRD/Ifremer, CS 10070, Ifremer, Plouzané, France
2 : Comité régional de la conchyliculture de Bretagne Sud, ZA Porte Océane, 7 rue du Danemark, Auray, France
3 : Unité Littorale, Laboratoire Environnement Ressource du Morbihan Pays-de-la-Loire, Ifremer, 12 Rue des Résistants, La Trinité-sur-Mer, France
Source Ices Journal Of Marine Science (1054-3139) (Oxford University Press (OUP)), 2019-11 , Vol. 76 , N. 6 , P. 1816-1824
DOI 10.1093/icesjms/fsz074
WOS© Times Cited 5
Keyword(s) aquaculture, citizen science, marine epidemiology and health, OsHV-1, risk analysis
Abstract

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-km2 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.

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Pernet Fabrice, Gachelin Sonia, Stanisière Jean-Yves, Petton Bruno, Fleury Elodie, Mazurié Joseph (2019). Farmer monitoring reveals the effect of tidal height on mortality risk of oysters during a herpesvirus outbreak. Ices Journal Of Marine Science, 76(6), 1816-1824. Publisher's official version : https://doi.org/10.1093/icesjms/fsz074 , Open Access version : https://archimer.ifremer.fr/doc/00491/60271/