Present study was conducted to find out the pathogenicity of three species of fungi,viz. Aspergillus niger, Aphanomyces laevis and Saprolegnia parasitica isolated from Gold fish (Carrasius auratus) collected from pet shops. Experiment was conducted for 10 days period with concentration of 8x10 3 conidia/ml (A.niger), 125 zoospores/ml (A.laevis) and 2x10 3 zoospores /ml (S.parasitica). All the tested fungi were found pathogenic to fish. Among the three species of fungi tested, A.laevis and S.parasitica showed 100% mortality in fish while A.niger showed 75% mortality. S.parasitica was found most virulent causing mortality within six days of experiment. Histopathological examination of fishes showed inflammation of epidermis , loss of epidermis and necrotized hypodermis. Degenerative changes were observed in musculature. Ulcerated skin showed mycotic granulommas. © 2014 iGlobal Research and Publishing Foundation. All rights reserved.