| Abstract: |
1- A total number of 755 fishes included, 450 0. niloticus and 305C gariepinus of different life stages, were obtained alive fromAbbassa fish farms and Sahl EI-Hosainia private fish farmduring the period from July 2009 to November 2010. Thesefishes were subjected to clinical, P .M., mycological andhistopathological examinations.2- The isolated fungi from infected fishes were Saprolegnia spp.,A.niger, A.Flavus, A.ochraceus, Afumigatus , Penicilliumsp., Cladosporium sp., Alternaria sp., Candida albicans andZygomycetes group (Mucor sp.,Rhizopus sp. and Absidia sp.).3- The prevalence of the total fungal infection was (32.7%) amongthe examined fishes, it was (49.3%) among examined 0.niloticus and (50.7%) among examined C gariepinus.4- The prevalence of different fungi among infected fishes, showedthat C gariepinus possessed the highest prevalence rate ofinfection (18.6%) , (7.7%) , (6.9%) , (5.3%) , (4%) and (2.8%)for A.niger, Zygomycetes group , A.flavus, penicillium sp.,Afumigatus and A.ochraceus respectively.While it was lowest(1.6%) for each of Cialbicans and Alternaria sp. followed by2% for cladosporium 5P. .In case of 0. niloticus the highestprevalence infection rate was 13.4% , 11%, 8.1 %, 7.7%, 2.8%and 2.4% for A.niger, Zygomycetes group, penicillium sp.,A.flavus, Afumigatus and Saprolegnia spp. respectively, whilethe lowest percentage was 0% for cladosporium sp. followed by1.6% for A.ochraceus,then 1.2% for each of Calbicans, andAlternaria sp .
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