Yersinia ruckeri septicaemia in experimentally infected carp (Cyprinus carpio L.) fingerlings
1999
Berc,A. | Petrinec,Z. | Matasin,Z. | Kozaric,Z.
15 carp fingerlings were experimentally infected with Y.ruckeri by intraperitoneal injection of about 5 X 105 cells.13 injected fish were moribund or died within 4 days with septicaemic lesions.Two survivors were sampled on day 28 after infection.Y.ruckeri was reisolated from the internal organs of all experimental fish.Histopathological examination showed that moribund fish had generalized bacteraemia with inflammation, degeneration and necrotic foci in kidney, liver and spleen, corresponding to findings described previously in ERM of rainbow trout.Survivors of challenge on day 28 had a chronic disease characterized by prominent peritonitis and enteritis, exhaustion of the erythroid, granuloid and lymphoid components in haematopoietic kidney tissue as well as focal degeneration and necrosis in organs.It is concluded that carp are highly susceptible to intraperitoneal infection with a relatively low dose of Y.ruckeri.
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