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Analysis of farm management strategies following herpesvirus (OsHV-1) disease outbreaks in Pacific oysters in Tasmania, Australia

Citation

Ugalde, SC and Preston, J and Ogier, E and Crawford, C, Analysis of farm management strategies following herpesvirus (OsHV-1) disease outbreaks in Pacific oysters in Tasmania, Australia, Aquaculture, 495 pp. 179-186. ISSN 0044-8486 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Elsevier B.V.

DOI: doi:10.1016/j.aquaculture.2018.05.019

Abstract

The microvariant genotype of Ostreid herpesvirus 1 (OsHV-1 μVar) has severely disrupted oyster production in Europe, New Zealand, and Australia by causing repeated and seasonal outbreaks of mass mortality in Pacific oysters (Magallana gigas). The virus was first detected in Tasmania, Australia, in January 2016, and mortalities of up to 87% were reported (de Kantzow et al., 2017). This study surveyed 95% of Tasmanian oyster farmers in OsHV-1 infected growing areas one year following initial detection, and recorded mortalities and associated farm management strategies in the 2016/2017 season, compared with the initial outbreak and before OsHV-1 occurrence. The survey was comprised of 37 open- and closed-ended questions, with data collected on background information, mortalities, environmental, genetic, and husbandry information. Perceived business viability was overall strong (75%), with changes to farm management occurring on 88% of leases in response to the virus. Commercial oyster farming businesses ranked handling regimes and stocking densities as the most important husbandry factors for influencing mortalities. Water temperature was ranked as the most important environmental factor, with 60% of businesses considering mean water temperature of 18 < 20 C sufficient to activate disease. Mortalities for oyster size classes across multiple years are also reported. This survey has provided an expedient and cost-effective method to obtain information on the impact of a highly virulent disease and associated environmental conditions across an industry. These results will inform future management strategies and associated research.

Item Details

Item Type:Refereed Article
Keywords:Magallana gigas, disease husbandry, Ostreid herpesvirus-1, Pacific oyster mortality syndrome
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fish Pests and Diseases
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Oysters
UTAS Author:Ugalde, SC (Ms Sarah Ugalde)
UTAS Author:Ogier, E (Dr Emily Ogier)
UTAS Author:Crawford, C (Dr Christine Crawford)
ID Code:131860
Year Published:2018
Web of Science® Times Cited:7
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2019-04-09
Last Modified:2019-05-06
Downloads:0

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