الفهرس 
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Abstract
Eighty samples of fresh water fish (50 Tilapia nilotica 30 Clarias lazera were collected randomly from fish markets in Assiut city during summer and winter seasons for Salmonella examination 5 portions from each fish (slime, scales gills, muscles of dorsum and tail and the intestine) were subjected to bacteriological examination. Slime, scales as well as gills were the most contaminated sites. While themuscles and intestine were free from Salmonellas. Two Salmonellae serotypes (4%) were isolated; Salmonella typhimurium was from slime and scales, and Salmonella paratyphi (B) was from the gills. from the public health aspect, the two sakmonellae serotypes isolated were of most importance, Salmonella typhimurium had frequently poisning outbreaks in Egypt, and Salmonella paratyphi (B) is a well known cause of human paratyphoid. It was noticed that the salmonellae serotypes isolated from the bigger and heavy weight fishes (20 : 30cm) but not from the smaller ones. Also Salmonellae isolated from Tilapia nilotica during summar season where the temperature of water ranged between (26.5 - 29.5 C) and the temperature of weather ranged between (35.40 C), that high temperature allow the growth and multiplication of the microorganisms.