الفهرس 
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Abstract
The obtained result revealed that the total aerobic mesophilic bacterial count observed in tilapia nilotica ,mugil cephalus , cat fish and common carp were 25 for previously types .
the total aerobic mesophilic bacterial count of tilapia fish samples with the average of 8.675 x 106 ± 1.07 x 106, while mugil cephalus with average 6.404 x 106 ± 8.66 x 105. Aerobic mesophilic count in cat fish with average 8.060 x 106 ± 10.62 x 105 and in common carp with average 6.868 x 106 ± 11.44 x 105.
the total enterobacteriacaea count in tilapia nilotica with average 7.087 x 104± 7.9 x 103 While result in mugil cephalus with average 4.192 x 104 ± 3.21 x 103 The total entero bacteriacae count in cat fish with average 10.516 x 104 ± 8.75 x 103 while in common carp with average 1.2252 x 105± 1.524 x 104.
the total coliform count in tilapia nilotica with average 4.268 x 104 ± 4.60 x 103 while in mugil cephalus with average 3.125 x 104 ± 3.65 x 103 . The result in cat fish with average 6.472 x 104 ± 6.49 x 103 while common carp with average 7.404 x 104 ± 1.420 x 104.
the total staph count with average 1.0695 x 103 ± 1.172 x 102 in tilapia fish while in mugil cephalus with average 7.876 x 102 ± 8.38 x 101 . The total staph count in cat fish with average 7.522 x 102 ± 9.78 x 101 while in common carp with average 5.564 x 102 ± 6.86 x 101.
the total mold count in tilapia nilotica with average 9 x 103 ± 0.34 x 103 , while mugil cephalus with average 10.88 x 103 ± 0.66 x 103 the total mold count with average 1 x 103 ± 0.06 x 103 . The total mold count in common carp are zero.
the total yeast count in tilapia nilotica with average 7.5 x 104 ± 1.630 x 104 , while mugil cephalus with average 7.224 x 104 ± 1.431 x 104 . Total yeast count of cat fish with average 9.984 x 104 ± 1.192 x 104 , while common carp with average 8.408 x 104 ± 1.232 x 104 .
The percentage of E coli isolated from tilapia nilotica ,mugil cephalus ,cat fish and common carp are 40%, 40%, 36% and 28% respectively. The serological identification of recovered isolate of E.coli clarified different serotypes
In tilapia fish are EHEC,ETEC,EPEC and EIEC are 20%, 30%, 40% and 10% respectively.
In mugil cephalus EHEC, ETEC, EPEC and EIEC are 22%,12%,44% and 22% respectively. In cat fish EHEC, ETEC, EPEC, EIEC are 25%, 12.5%, 50% and 12,5%
In carp fish EHEC, EPEC and EIEC are 33%, 50% and 17% respective.
salmonella in tilapia nilotica ,mugil cephalus cat fish and common carp are 44, 44, 92 and 36% respectively
the serological identification of recovered isolate of salmonellae clarified different serotypes. In tilapia S.enteritidis, S. anatum, S. typhimorium and S. Kentucky are 27, 9, 55 and 9% respectively. In mugil cephalus S.enteritidis, S.anatum, S.typhimorium are 33.3, 33.3 and 33.3 respectively. In catfish S.enteritidis, S.anatum, S.typhimorium , S.vichow and S.kentucky was26%,5%,53%,5% and 11%. In carp fish S. enteritidis, S. anatum, S. typhimorium , S. vichow S .muenster are 22.22, 11.11, 33.33, 22.22 and 11.11% respectively.