Fish is considered the main source of protein in Egypt, especially due to the shortage of red meat. In this study, one hundred random samples of Nile fish represented by Clarias lazera (C. lazera) and Oreochromis niloticus (O. niloticus) (25 of each fish species) and marine fish represented by Sardina pilchardus (S. pilchardus) and Mullus barbatus (M. barbatus) (25 of each fish species) were collected at different periods of time from various fish markets in Shibin Elkom city, Egypt. The samples had been analyzed using an atomic absorption spectrophotometer for the detection of mercury (Hg), lead (Pb), cadmium (Cd), and arsenic (As). In addition to Lactobacillus rhamnosus (L. rhamnosus ) used in decontamination of artificially inoculated fish fillet with different heavy metals. The mean values of Hg were 1.44 ± 0.03, of 1.13 ± 0.01, 0.81± 0.02 and 0.59± 0.01 mg/kg in C. lazera, O. niloticus, S. pilchardus and M. barbatus, respectively. Also, for Pb values were 0.78 ± 0.01, 0.61 ± 0.01, 0.39 ± 0.02 and 0.08 to 0.53 mg /kg C. lazera, O. niloticus, S. pilchardus and M.barbatus, respectively. The mean values of Cd were 0.43± 0.01, 0.26± 0.01, 0.04 to 0.49 and 0.05± 0.01mg/ kg in examined C. lazera, O. niloticus, S. pilchardus and M.barbatus, respectively. Meanwhile, As residues were 0.29± 0.01 and 0.16 ± 0.01 mg/kg in C. lazera and O. niloticus only. The L. Rhamnosus has the ability to reduce Hg, Pb, Cd and As experimentally inoculated to fish fillets with percentages 67.7%, 76.3%, 75% and 59%, respectively.
Key words: Keywords: lead, Cadmium, Mercury, Arsenic, L. rhamnosus, Fish
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