Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters

Ostreid herpesvirus-1 (OsHV-1) causes severe mortalities in commercially produced Crassostrea gigas, with oysters <1 yr of age being the most susceptible. It presents a significant threat to C. gigas aquaculture worldwide. Understanding the mechanisms behind the complex interactions of the pathog...

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Autores principales: O Evans, P Hick, N Dhand, RJ Whittington
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Publicado: Inter-Research 2015
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Acceso en línea:https://doaj.org/article/7056e63b20a143fa9140d761faa6fa11
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spelling oai:doaj.org-article:7056e63b20a143fa9140d761faa6fa112021-11-16T09:44:18ZTransmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters1869-215X1869-753410.3354/aei00160https://doaj.org/article/7056e63b20a143fa9140d761faa6fa112015-12-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v7/n3/p281-295/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Ostreid herpesvirus-1 (OsHV-1) causes severe mortalities in commercially produced Crassostrea gigas, with oysters <1 yr of age being the most susceptible. It presents a significant threat to C. gigas aquaculture worldwide. Understanding the mechanisms behind the complex interactions of the pathogen, host and environment and the mode of transmission of the virus has been difficult. The aims of this study were to (1) investigate the role that food plays in OsHV-1 transmission and mortality and (2) assess the dose-response effect represented by the number of OsHV-1-infected donor oysters cohabitated with healthy naïve oysters. Both addition of food and the number of donor oysters were important risk factors for OsHV-1 transmission and clinical disease in an aquarium model. Cumulative mortality was higher and incubation period (median time to death) was lower in fed oysters compared with non-fed oysters. Depending on the number of infected donors, fed oysters had a hazard of death 3.55 to 13.70 times that of non-fed oysters in the first 7 d post-exposure. Mortality rates were doubled when 6 donor oysters were included per tank compared with 2 donors in the first experiment. The severity of disease was lower in a second experiment conducted on a different batch of oysters. However, there was a consistent trend for increased hazard of death associated with food. OsHV-1 DNA was detected in aquarium water in both experiments but at low levels compared with prior studies, probably due to larger water volume, biofiltration and UV treatment. Results are consistent with the OsHV-1 particle attachment hypothesis; however, the adsorption of OsHV-1 to algal food particles and the effects of their ingestion are yet to be confirmed.O EvansP HickN DhandRJ WhittingtonInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 7, Iss 3, Pp 281-295 (2015)
institution DOAJ
collection DOAJ
language EN
topic Aquaculture. Fisheries. Angling
SH1-691
Ecology
QH540-549.5
spellingShingle Aquaculture. Fisheries. Angling
SH1-691
Ecology
QH540-549.5
O Evans
P Hick
N Dhand
RJ Whittington
Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
description Ostreid herpesvirus-1 (OsHV-1) causes severe mortalities in commercially produced Crassostrea gigas, with oysters <1 yr of age being the most susceptible. It presents a significant threat to C. gigas aquaculture worldwide. Understanding the mechanisms behind the complex interactions of the pathogen, host and environment and the mode of transmission of the virus has been difficult. The aims of this study were to (1) investigate the role that food plays in OsHV-1 transmission and mortality and (2) assess the dose-response effect represented by the number of OsHV-1-infected donor oysters cohabitated with healthy naïve oysters. Both addition of food and the number of donor oysters were important risk factors for OsHV-1 transmission and clinical disease in an aquarium model. Cumulative mortality was higher and incubation period (median time to death) was lower in fed oysters compared with non-fed oysters. Depending on the number of infected donors, fed oysters had a hazard of death 3.55 to 13.70 times that of non-fed oysters in the first 7 d post-exposure. Mortality rates were doubled when 6 donor oysters were included per tank compared with 2 donors in the first experiment. The severity of disease was lower in a second experiment conducted on a different batch of oysters. However, there was a consistent trend for increased hazard of death associated with food. OsHV-1 DNA was detected in aquarium water in both experiments but at low levels compared with prior studies, probably due to larger water volume, biofiltration and UV treatment. Results are consistent with the OsHV-1 particle attachment hypothesis; however, the adsorption of OsHV-1 to algal food particles and the effects of their ingestion are yet to be confirmed.
format article
author O Evans
P Hick
N Dhand
RJ Whittington
author_facet O Evans
P Hick
N Dhand
RJ Whittington
author_sort O Evans
title Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
title_short Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
title_full Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
title_fullStr Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
title_full_unstemmed Transmission of Ostreid herpesvirus-1 in Crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
title_sort transmission of ostreid herpesvirus-1 in crassostrea gigas by cohabitation: effects of food and number of infected donor oysters
publisher Inter-Research
publishDate 2015
url https://doaj.org/article/7056e63b20a143fa9140d761faa6fa11
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AT ndhand transmissionofostreidherpesvirus1incrassostreagigasbycohabitationeffectsoffoodandnumberofinfecteddonoroysters
AT rjwhittington transmissionofostreidherpesvirus1incrassostreagigasbycohabitationeffectsoffoodandnumberofinfecteddonoroysters
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