engleski

Yersinia ruckeri septicaemia in experimentally infected carp (Cyprinius carpio L.)fingerlings

The presence of Yersinia ruckeri, the causal of enteric redmouth disease (ERM) in salmonids and a few other freshwater fish, has so far been reported from a variety of sources incloding the intestine of healthy carp. Since there are no data on the pathogenicity of this bacterium for carp, 15 fingerlings were experimentally infected by intraperitoneal injection of about 5x100 000 cells. Thirteen injected fish were moribund or died within 4 days with septicaemic lesions. two survivors were sampled on Day 28 after infection. Yersinia ruckeri was isolated from the internal organs of all experimental fish. By histopatological examination moribund fish had generalised bacteriaemia with inflammation, degeneration and necrotic foci in kidney, liver and spllen, corresponding to findings described previously in ERM of rainbow trout. Survivors of challenge on Day 28 had chronic disease characterised by prominent peritonitis and enteritis, exhaustion of the erytroid, granuloid and lymphoid components in haematopoetic kidney tissue as well as focal degeneration and necrosis in organs. These data indicate a high sensitivity of carp to intraperitoneal infection with a relatively low dose of Y. ruckeri.

diseas (ERM); common carp (Cyprinus carpio); histopatology.

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