الفهرس 
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Abstract
Since fish and shellfish are subjeoted to the risk of contamination with various pathoens tither during their presence in their aquatic environments or afetr being harvested for marketing , this work, was done to assess sanitary conditions of Pilapia nilotica , Mugil cephalus , Sardine , Biva].via and Prawn caught from Natural sources , Fresh , Brachish and Marine water
Samples of Tilapia nilotica , Mugil cephalus , Sardine , Bivalvia and Prawn collectad ( 20 of each ) from different markets were examined bacteriologically
Incidence of the isolates were as follows :—
Sample
Organism 4-ye sample
Colifarm Enterococci V.P. S. aureus Saim.
Tilapia nilotica 18 11 10 20 2
Mugil cephalus 20 5 11 16 2
Sardine 15 5 1]. 10 —
Biya].yja 20 18 13 20 —
Prawn 20 19 15 6 —
Total 93 58 60 72 4
& V.P. Vibrio parahaemolyticus
Salm.= Salaonellae
Esoherichia coli , Morianella marsanii , Enterobacter
sersoviae , Enterobacter aerogenes , Serratia odorifera biotype 1, Enterobacter cloacae , Citrobacter diversus/amalonat , Entero— bacter sakaz&d. , Kiebsiefla oxytoca , Serratia marcesoens
Hafnia alvei • Proteus morgani , Aeromonas hytrophila, Citrobacter freimdii , Proteus rettgeri and Proteus vulgaris could be isolated from emnitned samples at varying percentages •
The presence of large nwnber of viable counts of Coliforms,
Enterococci , Vibrio parahaemolyticus , Staph. aureus and Entero-
bacteriaceae in examined fishes and shellfishes indicate that
they- cay infections when caught in polluted water of rivers,
lakes or even sea which now used for sewage disposal
So the presence of humen enteric pathogen in fishes and shelifishes may lead to human infection •
By experimental infection , Tilapia nilotica species
can harbour Vibrio parahanolyticus after (5) days when the
infection was via oral route and continued for another (3)
days and then disappead
On the other hand , if the infection was via skin , the
vibrio parahaemolytious could isolated from the muscles after 12 , 18 and 24 hours , respectively after the infection.