الفهرس 
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Abstract
Randomly, 160 fresh water fish samples ([80 samples from Nile
tilapia (Oreochromis niloticus) and 80 samples from Nile catfish (Clarias
gariepinus)] were collected from River Nile, earthen ponds and
Mansouriya canal in Cairo, Giza, and Qalyobiya governorates, EGYPT.
Some examined fish showed severe skin lesions, skin ulcers and peticheal
hemorrhage. Morphological, biochemical and molecular identification of
bacterial isolates revealed F. columnare and C. indologenes. Total
incidence of Flavobacteria was 65.6%, with individual incidence of 70% in
Nile catfish and 61.25% in Nile tilapia. Physicochemical parameters of
examined water samples favor disease development.