الفهرس 
Literature citedOnly 14 pages are availabe for public view
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Abstract
Heavy metals considered as one of the most insiQous and dangerous category of pollutants in the sea which enter the aquatic environment from both natural and anthropogenic sources. Metal contamination of aquatic environment may lead to deleterious effects fiom localized inputs which may be acutely or chronically toxic to aquatic life within the effected area. Most published data on the effects of metals on aquatic organisms, however, report adverse effects at concentrations higher than usually found in the environment. Metals are often accumulated in the tissues of organs whch have taken them up, and this leads to an amplification of the concentration of them in animals higher up to food chain. Not only do heavy metals constitute a direct threat to public health, they are a broad contaminants and its control is extremely Qfficult. 1. Ths work aimed to study the variation of metals in the tissues of commercial fish collected &om lfferent sites along the Egyptian coast, and their response to pollution in the sites. To manage the problem of metals accumulation in fish, depuration patterns were studied in a long-term experiments. The results obtained from the study can summarize in the following: I- Field research 1- Level of metals in fish: a) Muscle: The highest values of cadmium (0.09 pprn), copper (1.36 pprn), Mg (0.465 ppt), K (4.995 ppt) and Na (2.89 1 ppt) were found in fish collected fiom Port Said region. While, Pb (0.61 pprn), Zn (13.512 pprn), Co (0.189 ppm), Ni (2.468 pprn), Fe (47.46 ppm) and Ca (. 196 ppt) were in fish from the Gulf of Suez. b) Liver: The highest values of Cd (1.16 pprn), Pb (1 351 pprn), Co (1.1 1 ppm), Ni (19.76 ppm) and major elements, Ca, Mg, K and Na (1.875, 0.73 1, 9.633 and 2.603 ppt) were found in fish fiom the Gulf of Suez. Cu showed its highest level (81.17 ppm) in fish Mugil auratus collected fiom Port Said. Siganus rivulatus fiom Alexandria region and Red Sea had an elevated amount of zinc (1 02.90 ppm) and iron (573.59 pprn), respectively. c) Gills: The highest values of Cd (0.194 pprn), Pb (1.24 pprn), Zn (49.1 ppm), Co (0.81 pprn), Ni (3.13 pprn), Ca (0.194 ppt) and K (2.4 1 1 ppt) were found in fish from the Gulf of Suez. On the other hand, Cu (3.02 pprn), Fe (1191.30 pprn), Mg (1.32 ppt) and Na (2.845 ppt) were in fish fiom Mediterranean infiont of Port Said.