In Situ Characterisation of Pathogen Dynamics during a Pacific Oyster Mortality Syndrome Episode

Type Article
Date 2021-03
Language English
Author(s) Richard Marion1, Rolland Jean-Luc2, Gueguen YannickORCID2, de Lorgeril JulienORCID2, 5, Pouzadoux Juliette2, Mostajir Behzad6, Bec Beatrice3, Mas Sébastien4, Parin David4, Le Gall Patrik1, Mortreux Serge1, Fiandrino Annie1, Lagarde FranckORCID1, Messiaen Gregory1, Fortune Martine1, Roque D'Orbcastel Emmanuelle1
Affiliation(s) 1 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sète, France
2 : IHPE, Univ Montpellier, CNRS, Ifremer, UPVD, Montpellier, France
3 : MARBEC, Univ Montpellier CNRS Ifremer IRD, Montpellier, France
4 : OSU-OREME, Univ Montpellier CNRS IRD IRSTEA, Sète, France
5 : Univ Nouvelle Caledonie, Univ La Reunion, Ifremer, ENTROPIE,IRD, F-98800 Noumea, Nouvelle Caledo, France
6 : MARBEC, Univ Montpellier CNRS Ifremer IRD, Montpellier, France
Source Marine Environmental Research (0141-1136) (Elsevier BV), 2021-03 , Vol. 165 , P. 105251 (11p.)
DOI 10.1016/j.marenvres.2020.105251
WOS© Times Cited 3
Keyword(s) Crassostrea gigas, Aquaculture, Disease, Ostreid herpesvirus 1, Microbiota, Bacteria, Thau lagoon
Abstract

Significant mortality of Crassostrea gigas juveniles is observed systematically every year worldwide. Pacific Oyster Mortality Syndrome (POMS) is caused by Ostreid Herpesvirus 1 (OsHV-1) infection leading to immune suppression, followed by bacteraemia caused by a consortium of opportunistic bacteria. Using an in-situ approach and pelagic chambers, our aim in this study was to identify pathogen dynamics in oyster flesh and in the water column during the course of a mortality episode in the Mediterranean Thau lagoon (France). OsHV-1 concentrations in oyster flesh increased before the first clinical symptoms of the disease appeared, reached maximum concentrations during the moribund phase and the mortality peak. The structure of the bacterial community associated with oyster flesh changed in favour of bacterial genera previously associated with oyster mortality including Vibrio, Arcobacter, Psychrobium, and Psychrilyobacter. During the oyster mortality episode, releases of OsHV-1 and opportunistic bacteria were observed, in succession, in the water surrounding the oyster lanterns. These releases may favour the spread of disease within oyster farms and potentially impact other marine species, thereby reducing marine biodiversity in shellfish farming areas.

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Richard Marion, Rolland Jean-Luc, Gueguen Yannick, de Lorgeril Julien, Pouzadoux Juliette, Mostajir Behzad, Bec Beatrice, Mas Sébastien, Parin David, Le Gall Patrik, Mortreux Serge, Fiandrino Annie, Lagarde Franck, Messiaen Gregory, Fortune Martine, Roque D'Orbcastel Emmanuelle (2021). In Situ Characterisation of Pathogen Dynamics during a Pacific Oyster Mortality Syndrome Episode. Marine Environmental Research, 165, 105251 (11p.). Publisher's official version : https://doi.org/10.1016/j.marenvres.2020.105251 , Open Access version : https://archimer.ifremer.fr/doc/00669/78063/