الفهرس 
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Abstract
Since fish and shellfish are subjected to the risk of
contamination with various pathogenes either during their
presence in their aquatic environments or after being
harvested for marketing. This work was done to assess
sanitary condition of Tilalpia nilotica and Clarias lazera
which are the common type of fish in Egypt taken from
urban and rural markets.One hundred samples of Tilapia nilotica and Clarias
lazera Taken from urban and rural markets were examined
organolepticaly, Bacteriologicaly. Mycologically and chemic
ally. The organoleptic examination for the samples revealed
that all samples can be considered fresh, the overall mean
The Bacteriological examination revealed that the
total colony count from surface of Tilalpia nilatica and
Clarias lazera taken from urban and rural area in an
overall mean were (52.1 x 10 پ} 50 x 10 ) lower count
recorded from urban areas of Tilpia nilotica and Clarias
lazera than those of rural areas Muscle total colony count revealed that Tilpia nilotica of rural areas recorded higher count than those of urban
areas (890.4 } 63.73 , 783.2+ 60.74 x 10), respectively
Bacteria belonging to the following genera could be
isolated from the surface , muscle and intestine each of
Tilapia nilotica and Clarias lazera from urban and rural
areas in different percentages~ Escherichia, Salmonella,
Citrobacter, Enterobacter, Klebsiella, Proteus, Serratia,
Shigella, Pseudomonas. Flavobacterium, Achromobacter, Chrom—
obacterium, A)(a.ligenes, Aeromonas, Staphylococcus aureus
and S.epidermidis. Concerining the mould and yeast the
following genera could be isolated in different percentages
from the surface of Tilapia niloticna and Clarias lazera
from urban and rural areas; Aspergillus, Penicillium,
Cladosporium, Trichosporium, Thamnidium Fusarium, Mucor,
Trichoderma, and Candida, Torulopsis. Sacchromyces. and
Rhodotorula for yeasts. The chemical examination revealed that the PH values of Tilapia nilotica from urban and rural areas The presence of large number of total colony count total Enterobacteriacea count, total Coliform count and total Staphylococcus count in the examined samples indicates
that the fish loaded with these microorganisms from the
polluted water of the rivers and lakes which may be polluted
form sewage disposal and after catching during unsanitary
handling and marketing. The public health impotance of the
isolated microorganisms waS discussed.