查看文章

Five species of freshwater fishes (Cirrhinus mrigala, Catla catla, Puntius sophore, Glossogobius giuris and Labeo rohita) were affected by the epizootic ulcerative syndrome (EUS) in the Bangladesh Agricultural University campus. A monthly sampling was carried out from October 1997 to March 1998.

Clinically and histologically C. mrigala was severely affected by EUS, followed by C. catla, P. sophore and G. giuris. L. rohita was the least affected species. Large, deep and whitish ulcers were recorded in the lateral region (near the dorsal fin) and caudal region where parts of fins, scales and muscle were lost in most of the EUS affected fish. Massive necrosis of the epithelium and muscle tissue was observed in the affected tissue surrounding the granuloma. The granuloma due to fungal infection consisted of mononuclear epithelloid cells and fibrillar structures. Fungal granulomas were also found in the liver of C. mrigala and C. catla and in the kidney of C. mrigala only. However, the liver and kidney of other species had necrotic hepatocytes, renal tubules and glomeruli associated with many inflammatory cells.