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Diseases of Aquatic Organisms

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DAO 114:147-154 (2015)  -  DOI:

Denman Island disease in Washington State, USA: distribution and prevalence in Pacific and Olympia oysters

Ralph Elston1,*, Carolyn Friedman2, Lori Gustafson3, Gary Meyer4, Russell Rogers

1AquaTechnics 455 W. Bell Street, Sequim, WA 98382, USA
2School of Aquatic and Fisheries Sciences, University of Washington, 1122 NE Boat Street, Seattle, WA 98105, USA
3USDA APHIS Veterinary Services, Fort Collins, CO 80526, USA
4Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Rd., Nanaimo, BC, V9T 6N7, Canada
5Washington Department of Fish and Wildlife, 600 Capitol Way N, Olympia, WA 98501, USA
*Corresponding author:

ABSTRACT: We sampled over 2400 wild, feral, and cultured Pacific oysters Crassostrea gigas and Olympia oysters Ostrea lurida in Washington State, USA, from 2002 to 2006 to estimate the prevalence of infection with Mikrocytos mackini, the causative agent of Denman Island disease. Both histology and qualitative PCR methods were used. Estimates of true prevalence of M. mackini infection in C. gigas, after accounting for imperfect test sensitivity, ranged from mean values of 0 to 10.0% by histology and 0 to 8.4% based on pooled PCR samples. M. mackini was not detected in any of the O. lurida samples. Results suggest a lower prevalence of the pathogen and severity of this oyster disease in Washington than that indicated in previous reports from British Columbia, Canada, potentially attributable to higher seawater temperatures in the Washington sample locations.

KEY WORDS: Denman Island disease · Mikrocytos mackini · Crassostrea gigas · Ostrea lurida

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Cite this article as: Elston R, Friedman C, Gustafson L, Meyer G, Rogers R (2015) Denman Island disease in Washington State, USA: distribution and prevalence in Pacific and Olympia oysters. Dis Aquat Org 114:147-154.

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