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A previously undescribed ostreid herpes virus 1 (OsHV-1) genotype detected in the pacific oyster, Crassostrea gigas, in Ireland

Published online by Cambridge University Press:  19 July 2012

S. A. LYNCH*
Affiliation:
Aquaculture & Fisheries Development Centre, School of Biological, Earth & Environmental Sciences, University College Cork, The Cooperage, Distillery Fields, North Mall, Cork, Ireland
J. CARLSSON
Affiliation:
Aquaculture & Fisheries Development Centre, School of Biological, Earth & Environmental Sciences, University College Cork, The Cooperage, Distillery Fields, North Mall, Cork, Ireland
A. O. REILLY
Affiliation:
Aquaculture & Fisheries Development Centre, School of Biological, Earth & Environmental Sciences, University College Cork, The Cooperage, Distillery Fields, North Mall, Cork, Ireland
E. COTTER
Affiliation:
Aquaculture & Fisheries Development Centre, School of Biological, Earth & Environmental Sciences, University College Cork, The Cooperage, Distillery Fields, North Mall, Cork, Ireland
S. C. CULLOTY
Affiliation:
Aquaculture & Fisheries Development Centre, School of Biological, Earth & Environmental Sciences, University College Cork, The Cooperage, Distillery Fields, North Mall, Cork, Ireland
*
*Corresponding author: Tel:+353 (0) 21 4904615. Fax: +353 (0) 21 4904664. E-mail: s.lynch@ucc.ie

Summary

Significant mortalities of the Pacific oyster, Crassostrea gigas, have been reported worldwide since the 1950s. The impact these re-occurring mortality events have had on the C. gigas industry has highlighted the necessity to determine the factors that may be causing these mortalities. This study investigated the possible role of ostreid herpes virus (OsHV-1) in C. gigas mortalities over 2 successive summers at 2 study areas in Ireland. A single sample of adult C. gigas, which had been experiencing mortalities at one of the sites was screened. Successive cohorts of C. gigas spat obtained from a hatchery outside Ireland was relayed to both sites in 2003 and in 2004. Spat were screened each year prior to relaying. Samples were collected every 2 weeks and mortality counts were recorded and observed at both sites. Polymerase chain reaction (PCR) analysis and subsequent sequencing indicated that a previously undocumented variant genotype of OsHV-1 was present in the single cohort of adult C. gigas and in seed and juveniles at both sites, in both years. Analysis suggests that the Irish OsHV-1 μvar variant genotype is closely related to OsHV-1 μvar, first described in France in 2008.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2012

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