|Title:||Spatial distribution of mortality in Pacific oysters Crassostrea gigas: reflection on mechanisms of OsHV-1 transmission|
Dhand, Navneet K.
Whittington, R. J.
Ostreid herpesvirus 1
|Citation:||Paul-Pont, I., Dhand, N. K., & Whittington, R. J. (2013). Spatial distribution of mortality in Pacific oysters Crassostrea gigas: reflection on mechanisms of OsHV-1 transmission. Dis Aquat Organ, 105(2), 127-138. DOI: 10.3354/dao02615, available at http://www.int-res.com/abstracts/dao/v105/n2/p127-138/|
|Abstract:||The ostreid herpesvirus (OsHV-1) has the potential to devastate Crassostrea gigas culture in Australia as it has done in many other countries, highlighting the need for a better understanding of disease expression and transmission. The aim of this study was to assess the spatial distribution of OsHV-1 associated mortalities in one of only two infected areas in Australia, Woolooware Bay (Botany Bay New South Wales). In October 2011, healthy sentinel Pacific oysters were placed in three different locations at three different tidal levels and OsHV-1 associated mortalities were closely monitored over 7 months. The outbreak started in November 2011 and the disease remained active until April 2012. Three major mortality events were detected. Rather than being a propagating epizootic, it appeared that most oysters were infected from the same environmental source. The distribution of OsHV-1 associated mortalities was spatially clustered, highly variable and clearly dependent on the age of oysters and their position in the water column. Non-random distribution of mortalities at macro scale (sites several km apart) and micro scale (within rearing trays), and vertical clustering patterns in the water column are discussed in relation to mechanisms of transmission in water. We hypothesise that OsHV-1 may be carried through water by particles, possibly plankton. Key words: Crassostrea gigas, Ostreid herpesvirus 1, summer mortalities, spatial distribution, plankton, disease transmission|
|Type of Work:||Article|
|Appears in Collections:||Research Papers and Publications. Veterinary Science|
|spatial-distribution-PP-2013.pdf||740.27 kB||Adobe PDF|