ABSTRACT
A total sixty samples Nile tilapia [Qreochromis niloticus] and Clarias garpinus [Thirty of each] collected from fish markets of some villages of Kaliobia governorate and subjected to fat extraction and determination of organophosphrous residue by gas chromatography. Organophosphrous residues including diazinon, chlorpyrifos-ethyl, Malathion, Methyl-parathion, ethyl parathyion and Ethion with an incidence from muscles of Tilapia nilotica were [33%, 6.7%, 20%, 12%, 12% and 3% respectively] and from Clarias garpinus were[50%, 6.7%, 16%, 10%, 12% and 3% respectively]. The obtained result revealed that the residues of diazinon came in the first rank followed other organophosphrous residue. Most residues detected within action limit for fish, however, residues of these pesticide were not detected in collected samples may be due to their percent in very trace amount or gave indicter for safety environment from different types of pollution