الفهرس 
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Abstract
A total of 144 fish samples were collected. Ninety six Fish samples (Sigan) Siganus Rivulatus (Marbled Spinefoot) (14-18 cm length and 110±0.50 g weight) were collected from different four places (Attaka Port, Kornish, Oyon Mousa and Markets) along Gulf of suez in Suez province, Egypt. Six fish are obtained from each district at each season (summer, autumn, winter and spring). Fish samples (Shokhrom) Pomadasys Stridens (Striped Piggy) (12-16 cm length and 90± 0.50g weight) were collected also from the four different places randomly and seasonally the same as the previous samples. Samples had been collected for measuring heavy metals (Pb and Mn) by using Atomic Absorption Spectrometry. The periodic difference of Pb concentration based on the obtained data of water samples showed the following result: spring> winter> autumn> summer while, Mn concentrations showed the following result: summer> winter> autumn> spring Results of Pb concentrations in musculature of both Sigan and Shokhrom were exceeding the limits proposed by FAO/WHO food standards for fish. However, results of Mn concentrations were within the limits proposed by FAO/WHO food standards for fish. The mean concentration of heavy metals in the liver and gills of Siganus Rivulatus (Marbled Spinefoot) and Pomadasys Stridens (Striped Piggy) were markedly higher than those present in the edible parts of the fish and also the mean concentrations of heavy metals found in the bay water much lower than those obtained from different parts of fish. In conclusion these finding revealed that fish can be used as a biomarkers for heavy metal pollution in aquatic ecosystem