الفهرس 
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Abstract
A total of 702 samples (27 input water, 81 pond water, 27
feedstuffs, 81 bottom muds, 243 intestinal content and 243
surface swabs) were collected from El-Abbassa (governmental
fann) and EI- Warwary farm (private farm) during a period from
June to November 2012 and from March to May 2013 (summer,
autumn and spring), while winter season was excluded from this
study due to harvesting and marketing of fish. The collected
water samples were subjected to physico-chemical and
bacteriological examination for determination of their hygienic
condition. The other samples (feedstuffs, bottom mud and fish)
were subjected to bacteriological examination. The isolated
E.co/i, Aeromonas Spp, Staph. aureus and Ps. aeroginosa were
confirmed biochemically and 20 isolated E. coli were typed
serologically. In addition, 20 isolates of A.hydrophila and A.
caviae were subjected to PCR for detection of aerolysin (aer) and
hemolysin (hly) virulence genes.
J-Physico-chemical characteristics of water in fish farms.
Temperature of input and pond water ranged from 21.70 to
29.50 and from 20.81 to 30.50 QC, respectively in El-Abbassa
fish farm and from 20.50 to 30.50 and from 20.50 to 31.50
QC, respectively in El-Warwary fish farm. The mean values of
input water temperature were 27.08±0.312, 29.12±0.322 and
21.91±0.271 QC in spring, summer and autumn, respectively