Contaminants in terms of pesticide residues in selected fish sources [electronic resource].

Includes references.

The problem at hand is dealing with the assessment of selected fish species with respect to their content of pesticide residues. The investigated fish include; Caranx, Red Mullet, Crabs, Clams, Sole of Qaroun, lake Sole of Bardawillagoon and Catfish. The results indicated the presence of 15 components of organochlorine pesticides, namely; a.-benzene hexachloride (a-BHC), y-benzene hexachloride + β-benzene hexachloride (y-BHC + (>-BHC), Heptachlor, Aldrin, Heptachorepoxide, y-chlordane, a.-chlordane, 1,1-dichloro-2,2-bis (p·chlorophenyl) ethylene (P,P-DDE), Dieldrine, Endrin, I,l-dichloro 2,2-bis (P-chlorophenyl) ethane (P,P-DDD), 1,1,1-tricWoro-2,2-bis (P-chlorophenyl) ethane (p,P-DDT), Endosulfan sulfate, Methoxychlor and Endrin ketone. Concentrations of chlorinated hydrocarbons in tissues, serve as good indicators of environmental loads. The determination of organochlorine residues became necessary since in high-polluted regions, the polychlorinated biphen· yls (PCBs) are a point of discussion. With respect to fish samples (Sole) collected from Bardawillagoon, the obtained results indicated that none of the identified pesticides were detected in it. Subsequently, it could be stated that Bardawillagoon is the best source of fish and is considered to be completely free from pollutants. On contrary Sole of Qaroun Lake contain six types of pesticides and the lowest frequently detected one was 8.49 yg /Kg as Heptachlor while the highest concentration of methoxychlor was 1268.68 yg /Kg in the same sample. The residual concentration of the aforementioned pesticides varied within the tested fishes and Sole ofBardawil lagoon proved to be completely free from any residual amounts of the investigated pesticides as indicated and proved by statistical analysis, through the principal component and factorial analysis. Key words: Pesticide residues, Organochlorine, Marketable fishes.

Summary in Arabic.