الفهرس 
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Abstract
Fish have special importance from the nutritional standpoint being an excellent source of animal protein of superior quality as well as high content of phosphorus, calcium, Vitamin A and so many other nutrients.
Since fish are subjected to the risk of contamination with various pathogens either during their presence in their aquatic environments or after being harvested for marketing, So, this work was done to asses sanitary conditions and the occurrence of some potential pathogens of fish, also possible source of their contamination as well as public health significance of such pathogens.
Samples of Tilapia nilotica, Mugil cephalus, C/arias lazera and frozen fish (the most commonly fish types consumed in Egypt) were collected (50 of each) from different markets in Gharbia Governorate and evaluated microbiologically.
Incidence of the isolates were as follows:
Organism Sample E,coli Salmonella A.
hyDROPhila V.P S.
aureus A.
niger
SE S.T
Tilapia nilotica
Mugi/ cephalus
C/arias /azera
Froen fish 20%
14%
10%
8% 4%
2%
2%
0 2%
0
2%
0 16%
12%
6%
6% 32%
22%
50%
26% 30%
20%
36%
20% 14%
8%
26%
18%
SE. = Sa/rn one//a enteritidis
S. T. = Sa/monella typhymuriutn
VP. = Vibrio parahaemo/yticus
S. aureus = Staphy/o coccus aureus
A. niger = Aspregi//us niger.