الفهرس 
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Abstract
Eighty samples of fish (0.niloticus and Cl.gariepinus) and shellfish (Shrimp spp. and P.clarkii) 20 of each were examined for:(A) Determination of heavy metal residues (lead, cadmium and mercury) in both fish and shellfish species and the results obtained were:•Lead:Lead concentrations in 0.niloticus were ranged from 0.17 to 0.27 with a mean value of 0.2 ± 0.007. For Cl.gariepinus they were ranged from 0.16 to 0.28 with a mean value of 0.219 ± 0.011, in Shrimp spp. they were ranged from 0.16 to 0.27 with a mean value of 0.221 ± 0.009 and in P.clarkii they were ranged from 0.16 to 0.25 with a mean value of 0.185 ± 0.006.•Cadmium: Cadmium concentrations in 0.niloticus were ranged from 0.06 to 0.19 with a mean value of 0.104 ± 0.01, for Cl.gariepinus, they were ranged from 0.05 to 0.17 with a mean value of 0.093 ± 0.009, for Shrimp spp., they were ranged from 0.07 to 0.220 with a mean value of 0.129 ± 0.011 and in P.clarkii, they were ranged from 0.07 to 0.16 with a mean value of 0.101 ± 0.007.•Mercury:Mercury concentrations in 0.niloticus were ranged from 0.43 to 2.56 with a mean value of 1.08 ± 0.095, for Cl.gariepinus, they were value of 0 shrimp spp., they were ranged from 0.11 to 0.87 with 731 ± 0.04, for a mean value of 0.386 ± 0.047 and for P.clarkii, they were ranged from 0.12 to 1.12 with a mean value of 0.597 ± 0.093.(B) Determination of oxytetracycline residue c ncentrations in fish and shellfish :species: Oxytetracycline residues were negative in al the examined species of fish and shellfish.(C) Determination of trichlorfon residue conce and shellfish species::trations in fish All the examined samples of 0.niloticus, shrimp •p. and P.clarkii were negative for trichlorfon residues, except in Cl.ga lepinus, they were ranged from 0.02 to 0.31 with a mean value of 0 093 ± 0.027.from the obtained results of survey study, it’s hown that lead concentrations in all the examined fish and shellfis samples were within the permissible limits of EOS, 1991 (1 ppm) nd FAO/WHO, 1992 (1ppm).Concerning cadmium concentrations in 0.niloti us, (80%) were within the permissible limits and (20%) were over the ermissible limits of EOS, 1991 (0.1 ppm) and all the examined sam les (n=20) were over the permissible limits of FAO/WHO, 1992 (0.0 ppm), While in Cl.gariepinus 80% of the examined samples ‘.trere within the permissible limits and (20%) were over the permissible limits of EOS, 1991 and 10% of the samples were within the permissible limits and 90% were over the permissible limits of FAO/WHO, 992. For shrimp spp., 60% of the examined samples were within the permissible limits and 40% were over the permissible limits of EOS, 1991 and all the examined samples (n=20) were over the permissible limits of FAO/WHO, 1992 and for P.clarkii, all the examined samples were within the permissible limits of EOS, 1991 and FAO/WHO, 1992.Mercury concentrations in 0.niloticus, 5% of the examined samples were within the permissible limits and 95% were over the permissible limits of both EOS, 1991 (0.5 ppm) and FAO/WHO, 1992 (0.5ppm). Also in Cl.gariepinus, 5% of the examined samples were within the permissible limits and 95% were over the permissible limits of both EOS, 1991 and FAO/WHO, 1992. For shrimp spp. 85% of the examined samples were within the permissible limits and (15%) of the examined samples were over the permissible limits of both EOS, 1991 and FAO/WHO, 1992, and for P.clarkii, 55% were within the permissible limits and 45% of the examined samples were over the permissible limits of both EOS, 1991 and FAO / WHO, 1992.Only Cl.gariepinus fishes were positive to trichlorfon and all the examined samples were within the permissible limits (0.05 - 2 mg/kg product) given by FAO/WHO, 1986 and WHO 1992c.Public health hazards for heavy metals (lead, cadmium and mercury) were discussed.H- Experimental part:One hundred and ten samples of Cl.gariepinus were used for determination of(A)Oxytetracycline residues in laboratory aft mg/kg/day for 10 days and determination of oxytetracy during withdrawal period. dosing 75 line residues At 3rd day after ending of treatment, residue Concentrations were ranged from 2.5 to 4.45 with a mean value of 3.71 ± 0.217, at 10th day were ranged from 0.31 to 0.66 with a mean value of 0.469 ± 0.035 and at 21 days of withdrawal period, they wer ranged from 0.18 to 0.28 with a mean value of 0.223 ± 0.035.(B)Determination of trichlorfon residue concentrations in Cl.gariepinus muscles after treatment by 3 doses wil:h, 10 days interval between doses. The first dose was 0.25 mg kg, 2nd dose was 0.5 mg/kg and the 3rd dose was 0.5 mg/ kg.Trichlorfon concentrations at the 3rd day of 1st do e were ranged from 0.025 to 0.21 with a mean value of 0.071 ± 0.01 , at 10th day of the first dose, they were ranged from 0.075 to 0.13 with a mean value of 0.1 ± 0.009, after 2nd dose at the 10th day, the residue concentrations `Here ranged from 0.17 to 0.25 with a mean value of 0.206 ± 0.008, and at the 10th day from the 3r dose residue concentrations, they were ranged from 0.21 to 0.39 wi h a mean value of 0.295 ± 0.019.At clearance period after ending the treatment by 10 day the residue concentrations were ranged from 0.035 to 0 value of 0.086 ± 0.018, at 20th day of clearance concentrations were ranged from 0.001 to 0.031 with 0.014 ± 0.004.2 with a mean period residue mean value of from this results it’s concluded that oxytetracycline residue were detected after the withdrawal period (21 day) and the residue concentrations were over the maximum permissible limits (0.1ppm) given by FDA (Ruth and Reed, 1991). While trichlorfon results after clearance period were within the permissible limits (0.05 — 2 mg/kg product) given by FAO/WHO, 1986 and WHO, 1992c.• Public heath hazards for oxytetracycline and trichlorfon were discussed.