Data/hora: 01/06/2024 06:40:40

Provedor de dados: | 5
País: | France
Título: | Influence of low temperatures on the survival of the Pacific oyster (Crassostrea gigas) infected with Ostreid herpesvirus type 1
Autores: | Pernet, Fabrice; Tamayo, David; Petton, Bruno.
Data: | 2015-08
Ano: | 2015
Palavras-chave: | Bivalve; Disease; OsHV-1; Oyster; Temperature; Virus.
Resumo: | Mortalities of oyster seed of Crassostrea gigas associated with ostreid herpes virus OsHV-1 μVar have been observed in many oyster producing countries since 2008. The objective of this study was to further investigate whether low temperature treatments can offer a viable option to mitigate oyster mortalities. An experiment was set-up to further evaluate the effect of low temperature treatments (10 and 13°C vs. 21°C) and their duration (6 d to 83 d) on the survival of oysters previously infected with OsHV-1 μVar by means of exposure to field conditions in areas where mortalities were occurring. Average survival of oysters infected with OsHV-1μVar was 71% after 83 d at low temperatures compared to only 23% in controls maintained at 21°C. During cold-exposure, levels of OsHV-1 DNA in oyster tissues gradually decreased, down to nearly the detection limit after 24 d. However, when cold-acclimated oysters were suddenly exposed at 21°C in the laboratory, they exhibited high levels of mortality along with an enhancement of OsHV-1 DNA concentration in their tissues. Therefore, OsHV-1 persists in oysters even at low temperature and is reactivated during subsequent thermal elevation to 21°C. Low temperature treatments did not improve overall survival of oyster seed infected with OsHV-1. These results suggest that moving infected oysters to a cooler area only delays mortality and may increase the risk of infection in neighbouring stocks when rising temperatures become permissive for viral replication.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00259/37047/35555.pdf

DOI:10.1016/j.aquaculture.2015.04.010

https://archimer.ifremer.fr/doc/00259/37047/

Editor: | Elsevier Science Bv
Formato: | application/pdf
Fonte: | Aquaculture (0044-8486) (Elsevier Science Bv), 2015-08 , Vol. 445 , P. 57-62

Fonte:

2015 Elsevier B.V. All rights reserved.

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