PMID- 33548594 OWN - NLM STAT- MEDLINE DCOM- 20210316 LR - 20210316 IS - 1879-0291 (Electronic) IS - 0141-1136 (Linking) VI - 165 DP - 2021 Mar TI - In situ characterisation of pathogen dynamics during a Pacific oyster mortality syndrome episode. PG - 105251 LID - S0141-1136(20)31018-7 [pii] LID - 10.1016/j.marenvres.2020.105251 [doi] AB - 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. CI - Copyright (c) 2021 Elsevier Ltd. All rights reserved. FAU - Richard, Marion AU - Richard M AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. Electronic address: marion.richard@ifremer.fr. FAU - Rolland, Jean Luc AU - Rolland JL AD - IHPE, Univ Montpellier, CNRS, Ifremer, UPVD, Montpellier, France. FAU - Gueguen, Yannick AU - Gueguen Y AD - IHPE, Univ Montpellier, CNRS, Ifremer, UPVD, Montpellier, France. FAU - de Lorgeril, Julien AU - de Lorgeril J AD - IHPE, Univ Montpellier, CNRS, Ifremer, UPVD, Montpellier, France; Ifremer, IRD, Univ Nouvelle-Caledonie, Univ La Reunion, ENTROPIE, F-98800 Noumea, Nouvelle-Caledonie, France. FAU - Pouzadoux, Juliette AU - Pouzadoux J AD - IHPE, Univ Montpellier, CNRS, Ifremer, UPVD, Montpellier, France. FAU - Mostajir, Behzad AU - Mostajir B AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France. FAU - Bec, Beatrice AU - Bec B AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France. FAU - Mas, Sebastien AU - Mas S AD - OSU-OREME, Univ Montpellier, CNRS, IRD, IRSTEA, Sete, France. FAU - Parin, David AU - Parin D AD - OSU-OREME, Univ Montpellier, CNRS, IRD, IRSTEA, Sete, France. FAU - Le Gall, Patrik AU - Le Gall P AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Mortreux, Serge AU - Mortreux S AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Fiandrino, Annie AU - Fiandrino A AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Lagarde, Franck AU - Lagarde F AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Messiaen, Gregory AU - Messiaen G AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Fortune, Martine AU - Fortune M AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. FAU - Roque d'Orbcastel, Emmanuelle AU - Roque d'Orbcastel E AD - MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sete, France. LA - eng PT - Journal Article DEP - 20210109 PL - England TA - Mar Environ Res JT - Marine environmental research JID - 9882895 SB - IM MH - Animals MH - *Crassostrea MH - France MH - Shellfish MH - *Vibrio OTO - NOTNLM OT - Aquaculture OT - Bacteria OT - Crassostrea gigas OT - Disease OT - Microbiota OT - Ostreid herpesvirus 1 OT - Thau lagoon EDAT- 2021/02/07 06:00 MHDA- 2021/03/17 06:00 CRDT- 2021/02/06 20:11 PHST- 2020/04/20 00:00 [received] PHST- 2020/12/17 00:00 [revised] PHST- 2020/12/26 00:00 [accepted] PHST- 2021/02/07 06:00 [pubmed] PHST- 2021/03/17 06:00 [medline] PHST- 2021/02/06 20:11 [entrez] AID - S0141-1136(20)31018-7 [pii] AID - 10.1016/j.marenvres.2020.105251 [doi] PST - ppublish SO - Mar Environ Res. 2021 Mar;165:105251. doi: 10.1016/j.marenvres.2020.105251. Epub 2021 Jan 9.