الفهرس 
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Abstract
Since fish and shellfish are subjected to the risk of contamination with various pathogens either during their presence in aquatic environments or after being harvested for marketing. Thus, bacteriological examination was performed on one handred samples of Tilabia nilotica and Pagrus bayad (fifty of each).
The pseudoinonas organisms were detected from 68% and 42% of examined samples of T nilotica and P. bayad respectively. Furthermore, the total Pseudomonas count ranged from 40 to 2.6 x 103 with an average of 5.46 x 102 ± 1.10 x 102/g for T nilotica and 10 to 8 x 102 with an average 1.01 x 102 ± 0.36 x 102 for P. bayad. Moreover, non of examined P. bayad samples had Pseudomonas count over 103 whilemean, 14% of T. nilotica samples had Pseudomonas count ranged from 103 to < 104. Aeromonas organisms could be isolated from 38% and 22% of examined samples of T nilotica and P. bayad respectively and the total Aeromonas count ranged from 30 to 1.2 x 103 with an average 4.9 x 102 ± 0.88 x 102 for T. nilotica samples and 10 to 3 x 102 with an average 7.18 x 10 ± 0.28
x 10 for P. bayad samples.
Also non of examined samples of P. bayad had Aeromonas count over 103 while 6% of T. nilotica samples had Aeromonas count ranged
from 103 to < 104. Vibrio parahaemolyticus organism could be isolated from 30% of examined sample of T nilotice with total V. parahaemolyticus count ranged from 10 to 4.7 x 102 with an average 1.29 x 102+ 0.34 x 102. While V. parahaemolyticus could be isolated from 18% of examined samples ()I’ P. bayacl with total V. parahaemolyticus count ranged from 10 to 2.5 x 102 with an average 6.88 x 10 ± 0.26 x 10. All the examined samples of both T nilotica and P. bayad had count lower than the permissible international limits. Acientobacter species, Alcaligens Faecalis, Chromobactrium lividum, Citrobacter diversus, Citrobacter freundii, Enterobacter cloacae, E. aerogenes, E. agglomerans, E. harniae, Flavohacterium meningospticum, Klebsiella pneumoniae, Klebsiella ozaenae, Moraxella kingii, Proteus mirabilis, P. morganii, P. rettegeri, P. vulgaris, Serratia marcescens, Serratia liquefaciens and Serratia rubidaea were isolated in different percerrages. Moreover, Tilabia nilotica samples were found to harbour large number of bacterial species more than P. bayad samples .
Public health significance of isolated bacteria and possible sources of fish contamination as well as some recommendations to control such organisms were discussed.