الفهرس 
Water quality parametersOnly 14 pages are availabe for public view
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Abstract
affecting fish farms that use different sours of water (fresh water and agricultural drainage water). The water was subjected to physical, chemical and bacteriological examinations. Also heavy metal residues (iron, copper, zinc, cadmium and lead) were determined in both water and fish muscle. Organoleptic evaluations on catfish were done. In a laboratory experiment; the effect of feed types (flooting feed vs. sinking feed) on growth performance, feed utilization and body composition of African catfish ( Clarias graiepinus) was tested.
The physico- chemical properties of water differed significantly among the different sources of the culture water. The average concentration of heavy metals in water and fish were higher in drainage water than in fresh water. While, the average concentration of heavy metals in fish muscle samples was within the accepted limits according to international guidelines. Bacterial load (in muscles of reared fish) in agriculture drainage ponds was higher than that in fish reared in fresh water ponds. The statistical analysis of organoleptic properties showed (P<0.05) between agricultural drainage and fresh water fish; the values were (69.5 % and 85.1 %), respectively. Generally the quality of the fish reared in the agricultural drainage water was within the acceptable limits for the consumer.
On the other hand the laboratory study showed that no clear differences in fish growth performance when different feed types were used, while fish body composition were slightly different.