Residues of organochlorine insecticides in some fishes and birds in the gezira of Sudan

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Abstract
Twenty‐eight specimens representing five types of fish and five types of birds from the Gezira Research Farm, Wad Medani, Sudan, were analysed for residues of organochlorine insecticides. All fish muscle samples were found to contain pp′‐DDE, pp′‐TDE and pp′‐DDT in total concentrations ranging from 0.27 to 16.0 mg/kg. In addition to DDT‐type residues, dieldrin (HEOD) was also found in the majority of bird samples. Concentrations in bird breast muscle ranged from 0.07 to 5.5 mg/kg. When bird liver samples were examined they were found to contain higher residues than the breast muscle in nearly all cases.