الفهرس 
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Abstract
In total, 120 freshwater and marine water fish were obtained from El-Obour city fish market, Egypt. Fish samples were chosen from apparently freshwater fish that showed no signs of deterioration. from February to August 2022, six fish species (20 of each) were collected including: Three fresh water fish (O. niloticus, M. cephalus, and L. niloticus) and three marine water fish (E. tauvina, P. leopardus, and L. nebulosus).
The obtained results revealed detection of Pb in all examined samples. L.niloticus had significantly (p < 0.05) the highest residual Pb content (mg/Kg ww) (0.31±0.04), followed by E. tauvina (0.17±0.03), M. cephalus (0.11±0.03), O. niloticus (0.09±0.02), L. nebulosus (0.08±0.01), and P. leopardus (0.06 ± 0.01).
Cadmium was also detected in all examined fish spp. similar to Pb, L. niloticus had significantly (p < 0.05) the highest residual Cd content 0.13±0.02 mg/Kg ww, followed by E. tauvina, M.cephalus, P.leopardus, O. niloticus and L.nebulosus with average Cd content of 0.11±0.02, 0.08±0.02, 0.07 ± 0.01, 0.04±0.01, and 0.03±0.01 mg/Kg ww, respectively.