ABSTRACT: Grossly visible lesions of the ctenidia and occasional mortalities in Japanese oyster Crassostrea gigas from the Atlantic French coast were reported in 1992-1993. From August 1992 to March 1993, 235 living oysters were collected to determine the cause of tissue lesions and mortalities. Microscopical examination of fixed, stained sections revealed that 53.2% of these oysters had ctenidia and mantle lesions associated with irregular basophilic and Feulgen positive cytoplasmic inclusion bodies. Ultrastructurally, the infectious agent was a chlamydia-like organism. Indirect fluorescent and peroxidase conjugated antibody tests suggested that this agent might share common antigens with the procaryotic agent Chlamydia psittaci, strain ovis.

KEY WORDS: Crassostrea gigas . Pacific oyster . Chlamydia-like organisms . Ctenidia . Mantle

Published in DAO Vol. 23, No. 2 (1995) on October 26
ISSN: 0177-5103. Copyright © Inter-Research, Oldendorf/Luhe, 1995