الفهرس 
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Abstract
A total of 80 random samples of fish (Tilapia nilotica, Mugil cephalus, shrimp and crab) (20 of each) were collected from different localities in Zagazig city, Sharkia Governorate, Egypt. The samples were labeled and packaged in separate sterile plastic bags, then directly transferred to the post graduate laboratory, Food Control Department, Faculty of Veterinary Medicine, Zagazig University under complete aseptic conditions without delay. All collected samples were subjected to organoleptic and bacteriological examinations to estimate the presence of Staph.aureus, Salmonella in some fresh fish
The results obtained were summarized as the following:
1- Organoleptic examination:
All the examined Tilapia nilotica, Mugil cephalus, shrimp and crab samples (100%) were organoleptically good. All the samples appear as fit for human consumption.
2- Microbiological examination
A- Staph.aureus
The total Staph.aureus count ranged from 2.30 to 4.78, 2.00 to 4.48, 2.30 to 4.60 and 2.48 to 4.30 with mean values of 3.23±0.17 log10 CFU/g, 3.06±0.21 log10 CFU/g , 3.49±0.23 log10 CFU/g and 3.53±0.20 log10 CFU/g in the examined Tilapia, Mullet, shrimp and crab, respectively.
The prevalence of coagulase positive Staph.aureus in.