Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas
Mortalities of oyster Crassostrea gigas seed associated with ostreid herpesvirus OsHV-1 μVar have been observed in many oyster-producing countries since 2008. The present study, comprised of 4 complementary experiments, aimed to identify factors associated with disease-induced oyster mortality in or...
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ftarchimer:oai:archimer.ifremer.fr:36777 2023-05-15T15:58:22+02:00 Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas Petton, Bruno Boudry, Pierre Alunno-bruscia, Marianne Pernet, Fabrice 2015-05 application/pdf https://archimer.ifremer.fr/doc/00257/36777/35390.pdf https://doi.org/10.3354/aei00125 https://archimer.ifremer.fr/doc/00257/36777/ eng eng Inter-research https://archimer.ifremer.fr/doc/00257/36777/35390.pdf doi:10.3354/aei00125 https://archimer.ifremer.fr/doc/00257/36777/ The authors 2015. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un - restricted. Authors and original publication must be credited. info:eu-repo/semantics/openAccess restricted use Aquaculture Environment Interactions (1869-215X) (Inter-research), 2015-05 , Vol. 6 , N. 3 , P. 205-222 Epidemiology Risk analyses Shellfish farming Virus OsHV-1 mu Var text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.3354/aei00125 2023-03-14T23:55:18Z Mortalities of oyster Crassostrea gigas seed associated with ostreid herpesvirus OsHV-1 μVar have been observed in many oyster-producing countries since 2008. The present study, comprised of 4 complementary experiments, aimed to identify factors associated with disease-induced oyster mortality in order to propose mitigation strategies. Our first experiment compared survival of oysters from natural spatfall with others sampled from nurseries, after thermal elevation in the laboratory from <14 to 21°C. A total of 60% of the tested wild seed batches (n = 51) were infected by OsHV-1, exhibited mortality and were able to transmit the disease to cohabited naïve oysters. Comparatively, only 1 out of the 32 tested batches sampled from nurseries presented similar characteristics. In a second experiment, we studied the effects that timing and duration of exposure to field conditions had on risk of infection and mortality in the laboratory at 21°C. Naïve oysters deployed in the field during winter and spring, when seawater temperatures were <14.7°C, showed no mortality in the laboratory, and OsHV-1 DNA was not detected by PCR. However, in oysters transferred to the field, OsHV-1 was observed when seawater temperature reached ~15.3°C. Our third experiment showed that the odds of mortality decreased with age of oysters when facing the disease. Further, we observed that odds of disease mortality decreased with water renewal and increased with the biomass of neighbouring infected oysters under controlled conditions. Based on these findings, we propose mitigation strategies in terms of the regulation of oyster movements between sites, timing of seeding and spatial planning, taking into account seawater temperature and seed origin. Article in Journal/Newspaper Crassostrea gigas Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Aquaculture Environment Interactions 6 3 205 222 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Epidemiology Risk analyses Shellfish farming Virus OsHV-1 mu Var |
spellingShingle |
Epidemiology Risk analyses Shellfish farming Virus OsHV-1 mu Var Petton, Bruno Boudry, Pierre Alunno-bruscia, Marianne Pernet, Fabrice Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
topic_facet |
Epidemiology Risk analyses Shellfish farming Virus OsHV-1 mu Var |
description |
Mortalities of oyster Crassostrea gigas seed associated with ostreid herpesvirus OsHV-1 μVar have been observed in many oyster-producing countries since 2008. The present study, comprised of 4 complementary experiments, aimed to identify factors associated with disease-induced oyster mortality in order to propose mitigation strategies. Our first experiment compared survival of oysters from natural spatfall with others sampled from nurseries, after thermal elevation in the laboratory from <14 to 21°C. A total of 60% of the tested wild seed batches (n = 51) were infected by OsHV-1, exhibited mortality and were able to transmit the disease to cohabited naïve oysters. Comparatively, only 1 out of the 32 tested batches sampled from nurseries presented similar characteristics. In a second experiment, we studied the effects that timing and duration of exposure to field conditions had on risk of infection and mortality in the laboratory at 21°C. Naïve oysters deployed in the field during winter and spring, when seawater temperatures were <14.7°C, showed no mortality in the laboratory, and OsHV-1 DNA was not detected by PCR. However, in oysters transferred to the field, OsHV-1 was observed when seawater temperature reached ~15.3°C. Our third experiment showed that the odds of mortality decreased with age of oysters when facing the disease. Further, we observed that odds of disease mortality decreased with water renewal and increased with the biomass of neighbouring infected oysters under controlled conditions. Based on these findings, we propose mitigation strategies in terms of the regulation of oyster movements between sites, timing of seeding and spatial planning, taking into account seawater temperature and seed origin. |
format |
Article in Journal/Newspaper |
author |
Petton, Bruno Boudry, Pierre Alunno-bruscia, Marianne Pernet, Fabrice |
author_facet |
Petton, Bruno Boudry, Pierre Alunno-bruscia, Marianne Pernet, Fabrice |
author_sort |
Petton, Bruno |
title |
Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
title_short |
Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
title_full |
Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
title_fullStr |
Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
title_full_unstemmed |
Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas |
title_sort |
factors influencing disease-induced mortality of pacific oysters crassostrea gigas |
publisher |
Inter-research |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00257/36777/35390.pdf https://doi.org/10.3354/aei00125 https://archimer.ifremer.fr/doc/00257/36777/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Aquaculture Environment Interactions (1869-215X) (Inter-research), 2015-05 , Vol. 6 , N. 3 , P. 205-222 |
op_relation |
https://archimer.ifremer.fr/doc/00257/36777/35390.pdf doi:10.3354/aei00125 https://archimer.ifremer.fr/doc/00257/36777/ |
op_rights |
The authors 2015. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un - restricted. Authors and original publication must be credited. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3354/aei00125 |
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Aquaculture Environment Interactions |
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6 |
container_issue |
3 |
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205 |
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