الفهرس 
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Abstract
A total of 75 samples of fish fillets of tilapia nilotica, Catfish and Bagrus bayad (25 feach) were collected randomly from different super markets for bacteriological and mycological evaluation.
Bacteriological examination revealed that the mean values of total bacterial palate count, total psychrotrophic count, total
Enterobacteriaceae count, total staphylococci count were 2.94 x 106 ± 2.67xlO5cfu/g, l.35xl051.15x104cfuJg, l.87x105±2.38x cfulg, 1.98 x ± 3.5 x 10/g and 8 x i0 ± 2 x cfU/g. for Tilopia nilatica fillets, 3.48 x 106 ± 5.51 x i05 cfulg, 2.4 x i0 ± 2.95 x i04 cfulg, 2.32x 105±2.3x lO4cfu/g, 8.58x 104±9.7x cfulgand lx iO±
2.04 x 103/g for Catfish fillets and 2.1 x 106 ± 4.03 X i0, 1.58 X
105±1.67x104, 1.35x iO±i.i5 x i04, 1.08x 105±2.22x lO4and6.6x i03 ±1.96 x 103/g. for Bagras bayad fillets, respectively.
The incidence of Salmonella spp isolated from fish fillets samples was 4%, 16% and 0 for Tilapia nilotica, Catfish and Bagrus bayad, respectively.
On the other hand, myco logical examination revealed that the mean values of total mould count were 3 x i0 ± 1.53 x 102, 3 x i0 ± 6.32 x 102 cfulg and 2 x i03 ± 2.58 x 102 cfiulg for Tilapia nilotica, Catfish and Bagrus bayad, respectively. While, the mean values of total yeast count were 2 x103 ± 5.77 x 10 cfu/g, 4 x i0 ± 9.13 x 102 cfu/g and 3.4 x i03 ± 1.17 x 102 cfu/g. for Tilapia nilotica, Catfish and Bagrus bayad, respectively.
The mould and the yeast isolated from examined samples of Tilapia nilotica were Aspergillas niger (32%), Mucor spp (24%), Cladosporium spp (16%), candida spp (36%), Torulopsin (8%) and Rhodotorula (12%), Catfish were (64%), (32%), (12%), (44%), (16%)
and (24%) and Bagrus bayed were (20%), (12%), (0%), (0%), (8%) and (0%), respectively.