الفهرس 
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Abstract
The present study was conducted to investigate factors affecting fish live at different sources of water (Agricultural drainage, Industrial drainage and sewage wastewater). The water was subjected to physical, chemical and biological analysis. Also, trace metals (zinc, copper, lead, cadmium, chromium, aluminium, manganese, nikel and cobalt) were determined in water, sediment and fish organs (muscle, gills, kidney and liver tissues).
The physico-chemical properties of water showed significant difference among the different sources of the water. The industrial drainage and sewage water revealed the highest concentrations of heavy metals (especially for zinc and chromium) followed by agricultural drainage water. The muscle, gills, kidney and liver tissues of fish samples present in industrial drainage and sewage canals showed the highest levels of heavy metal residues followed by agricultural drainage canals.
from the obtained results, it can be concluded that conditions at industrial drainage, sewage and agricultural drainage canals are not safe to produce fish for human consumption. The heavy metal studies revealed that there is a public health hazard associated with industrial drainage, sewage wastewater and agriculture drainage as the quality of fish did not comply with the standard levels recommended by World Health Organization (WHO), United States Environmental Protection Agency (USEPA) and Australian and New Zealand Conservation Council (ANZECC). Potential adverse health effect in such applications could be avoided if the wastewater from the studied sources is sufficiently treated.