Abstract:

Epizootic ulcerative syndrome (EUS) is a serious disease of tropical fish. Al-though reported in over 100 species of fish, its impact on the widely cultured Indian major carps has not been properly assessed. Using artificial infection tests with Aphanomyces invadans, the etiological agent of EUS, the present investigation examined the disease susceptibility of fingerlings of Indian major carps. The disease susceptibility experiments indicated that there was 100% mortality in the case of all the three species of Indian major carps within an experimental period of 12 days. Histopathological examination of all the moribund fish indicated extensive myonecrosis in large areas of myotome and severe necrotic lesions in almost all internal organs due to the invasive spread of the hyphae. The massive internal necrotic pathology was reflected in the form of severe gross lesions and was always associated with mortalities. From the present study, it is confirmed that fingerlings of Indian major carps are highly susceptible to A. invadans infection. This is the first ever experimental infection studies with A. invadans in Indian major carps.

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Date 2008/12/06

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