Abstract
Present study was carried out on commercially important fresh water fish (Clarias batrachus).A total number of 36 fishes infected with ulcerative mycoses were collected from Larpur reservoir, Bhopal. Isolation of fungi from different parts of body of fish showed the presence of Saprolegneous fungi ( Saprolegnia diclina) in all the specimens collected. Pathogenicity of isolated fungi was tested on host fish with concentration of 2x104 zoospores /ml and all the fishes got infection leading to 100% mortality within ten days. Histopathological studies of infected fishes showed varying degree of destruction in the tissue. Skin showed loss of epidermis, necrotized hypodermis and penetration of hyphae in underlying musculature with fibrillar granuloma. Degenerative liver and kidney cells with fungal spores were found, gills showed degeneration of lamellae. The aim of present work is to find out the parasitic ability S.diclina with its histtopathological studies.
