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Diseases of Aquatic Organisms

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DAO 59:205-209 (2004)  -  doi:10.3354/dao059205

Viral gametocytic hypertrophy caused by a papova like virus infection in the Pacific oyster Crassostrea gigas in Korea

Dong Lim Choi1,*, Nam-Sil Lee1, Hee Jung Choi1, Myoung-Ae Park1, Sharon E. McGladdery2, Mi Seon Park1

1Pathology Division National Fisheries Research and Development Institute, Gijang, Busan 619-902, Republic of Korea
2Shellfish Pathology National Aquatic Animal Health, DFO Gulf Fisheries Centre DFO National Headquarters, 343 University Avenue, Moncton, Ottawa K1A 0E6, Canada

ABSTRACT: During a routine survey of the Pacific oyster Crassostrea gigas in Tongyoung (previously Chungmu) on the southern coast of Korea, basophilic inclusions were observed in the gonadal tissues. They were detected from March to May at a prevalence rate of 3.3 to 7.1%. The inclusion bodies were Feulgen-positive and stained orange-red with phloxine tartrazine. Electron microscopic observation revealed non-enveloped, icosahedral particles 40 to 45 nm in diameter. These morphological characteristics resemble those of papova virus-like inclusions previously described from Pacific and eastern (American) oysters C. virginica in North America. Although many mitochondrial bodies and intact sperm cells were observed around the inclusion body, no host reaction, such as hemocytic infiltration, was detected.

KEY WORDS: Pacific oyster · Crassostrea gigas · Viral gametocytic hypertrophy · Papova-like virus · Seminal gland

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