الفهرس 
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Abstract
180 samples of different species (Orochromise niloticus, Tilapia zilli, Mugil cephalus and Claris lazera) were collected randomly during the period of October to December 2014 from five locations (Bahr El-Baqar, El-Salam Canal, Bahr Hadous, Lake Manzala and El-Boughdady) according to the availability of each species in each location (10 of each species). These locations are the main sources of fish in Manzala city. In a trial to reduce heavy metal concentrations, sixty random fish samples of O. niloticus were collected from Bahr El-Baqar and exposed for precooking treatment by dipping in a distilled water or lemon juice o then cooked by different cooking methods.
The results of organoleptic examination revealed that all of the examined fish were fit for human consumption.
Heavy metal concentrations (Pb, Cd, As, Cu, Zn, Ni, Co, Mn, Fe, Cr and Hg) in muscles of raw and cooked fish were estimated by using (ICP-OES) after wet digestion and the obtained values were compared with the permissible limits of different organizations and discussed the public health significance of these heavy metals. Also, the effect of the common cooking methods (boiling, grilling, and frying) on heavy metal concentrations was evaluated in Oreochromis niloticus collected from Bahr El-Baqar after dipping in distilled water and lemon juice as a trial for a reduction of heavy metal concentrations.