الفهرس 
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Abstract
1- A total number of 755 fishes included, 450 0. niloticus and 305
C gariepinus of different life stages, were obtained alive from
Abbassa fish farms and Sahl EI-Hosainia private fish farm
during the period from July 2009 to November 2010. These
fishes were subjected to clinical, P .M., mycological and
histopathological examinations.
2- The isolated fungi from infected fishes were Saprolegnia spp.,
A.niger, A.Flavus, A.ochraceus, Afumigatus , Penicillium
sp., Cladosporium sp., Alternaria sp., Candida albicans and
Zygomycetes group (Mucor sp.,Rhizopus sp. and Absidia sp.).
3- The prevalence of the total fungal infection was (32.7%) among
the 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, showed
that C gariepinus possessed the highest prevalence rate of
infection (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 by
2% for cladosporium 5P. .In case of 0. niloticus the highest
prevalence 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, while
the lowest percentage was 0% for cladosporium sp. followed by
1.6% for A.ochraceus,then 1.2% for each of Calbicans, and
Alternaria sp .