الفهرس 
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Abstract
This study aimed to investigate the prevailing bacterial diseases in 200 Clarias
gariepinus fish samples over one year (March 2019- Febreuary 2020). They were
collected from fish farms in Ismailia governorate. The collected fishes were clinically
examined; samples were taken from gills, liver, kidney for isolation and identification of
bacteria. Clinical examination of naturally infected C. gariepinus displayed
hemorrhages, ulcers and macerated muscle on the flank, and redness at the base of fins.
Post mortem examination of naturally infected C. Gariepinus revealed enlarged liver,
engorged spleen, congested kidney, inflammed heart and distended intestine.
Morphological and biochemical tests detected infection with Aeromonas hydrophila,
Aeromonas veronii biovar sobria, Enterococcus faecalis and Klebsiella pneumoniae.
Furthermore confirmation for bacterial isolates was done using Microbact GN24 kits,
VITEK2 compac system and PCR. Results showed the prevalence of Aeromonas
hydrophila (44%), Aeromonas veronii biovar sobria (32%), Enterococcus faecalis
(53%) and Klebsiella pneumoniae (28%).The highest prevalence was recorded in
summer for all bacterial infections while winter recorded the lowest prevalence. The
highest prevalence of infection was in liver for Aeromonas spp. and Enterococcus
feacalis while gills were the highest for Klebsiella pneumoniae.