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Mass Mortality Caused by Nocardial Infection in Cultured Snakehead, Channa arga in Korea  

Park, Myoung-Ae (Pathology Team, National Fisheries Research and Development Institute)
Lee, Deok-Chan (Pathology Team, National Fisheries Research and Development Institute)
Cho, Mi-Young (Pathology Team, National Fisheries Research and Development Institute)
Choi, Hee-Jung (Pathology Team, National Fisheries Research and Development Institute)
Kim, Jin-Woo (Pathology Team, National Fisheries Research and Development Institute)
Publication Information
Journal of fish pathology / v.18, no.2, 2005 , pp. 157-165 More about this Journal
Abstract
A new disease causing mass mortality of farmed snakehead (Channa arga) has emerged in Korea over the summer of 2005. The affected fish showed no specific external signs with the exception of a distended abdomen and hemorrhaging around the anus. After opening the abdomen, the visceral organs, liver, spleen and kidney, present numerous white nodular structures. Histopathological examination revealed these nodules to be evidence of granulomas in the visceral organs. A Gram-positive, filamentous bacterium was isolated from all of the affected fish. Development of primers for a genus-specific peR assay for Nocardia, following analysis of the sequences of the complete 16S rRNA genes from Nocardia spp. and non-Nocardia bacterial genes, allowed identification of the causative organism as Nocardia. This is the first report of a nocardial infection of fish in Korea.
Keywords
Nocardia sp.; Snakehead; Channa arga; Nodular; Granuloma; Nocardial infection;
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Times Cited By KSCI : 1  (Citation Analysis)
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