الفهرس 
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Abstract
The impact of heavy metals e.g. cadmium (Cd), lead (Pb), manganese (Mn), tin (Sn), mercury (Hg) and chromium (Cr) was assessed on consumed bivalves by Ismailia residents. Metals; Mn, Cr, Cd, Hg and Sn were detected in whole body of bivalves during summer and winter season. Lead exhibited the greatest concentration, 70.70 mg/kg in species; the grooved carpet shell. Moreover, Cr exhibited the proportions, 413.22 and 261.84 mg/kg in the grooved carpet shell and surrclam, respectively. chronic daily intakes (CDIs) of heavy metals showed mean values; 2.04, 0.765, 1.91, 0.035, 1.775 and 0.50 mg/kg/day for Mn, Cr, Cd, Pb, Hg and Sn, respectively, at 50 and 90th percentile of ingestion. CDI values ranged from 0.36 to 1.15 mg/kg/day. The induction of oxidative stress by some potential toxic metals on bivalves in Temsah Lake, Egypt was demonstrated. Metals e.g. cadmium (Cd), lead (Pb), manganese (Mn), tine (Sn), mercury (Hg) and chromium (Cr) exhibited concentration levels exceeded than international permissible limits. Thus, they induced alteration in carbonyl protein (CP) in tissues of species; golden venus, the grooved carpet shell, surrclam and comb circe with values; 0.22, 0.20, and 0.14 mmol/g tissue, respectively. Catalase (CAT) and glutathione peroxidase (GPx) exhibited activities in all samples collected from sites lower than those of samples collected from Suez Canal. Moreover, the impact of pollutants on bivalves during summer was greater than that during winter season. Slightly positive correlation was observed for CP with concentrations of Cd, Pb and Sn (r=0.26, 0.05 and 0.44, respectively). Antioxidant defense enzymes e.g. CAT and GPx exhibited negative
Corelation with metale concentration, except wich exhipted posstive correlation with them (r=0.82 and 0.85).
Keywords: Bivalves, PAHs, Heavey metals, antioxidant defense enzymes, Temsah Lake.