摘要
This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacularlus） from Lake Naivasha, Kenya. p,p＇-DDT, p,p＇-DDE, p,p＇-DDD, heptachlor, heptachlor epoxide, aldrin, dieldrin and methoxychlor were analyzed in fish specimens collected from Lake Naivasha during the months of November - December in 2008. The pesticide concentrations （in ~ag/Kg, wet weight） ranged within 0.42-4.185 p,g/Kg, for Heptachlor, BDL-0.291 Heptachlor epoxide, 0.433-4.733 Aldrin, BDL -0.341 Dieldrin, p,p＇ DDT, BDL-6.691 p,p＇ DDE, BDL-27.153 p,p＇ DDD, and BDL-28.867 methoxychlor. The pesticide residue levels varied widely between and within species. C. spectacularhts showed high pesticide levels followed by C. carpio and O. leueostictus respectively; this was attributed to the trophic position and age/size of fish. The occurrences of the pesticides indicate recent use in the catchment. The mean values and ranges of residues found in fish ware below the FAO/WHO maximum acceptable limits in fish and sea food however increased monitoring is recommended to detect any changes.
