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Organochlorine Contaminants in Nile Tilapia, Oreochromis niloticus (Linnaeus 1758) in Densely Populated Areas of South-Western Kenya

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Journal of Environmental Science and Engineering(B) 2020年第4期9卷 153-161页

作者： Joseph Nyaundi Albert Getabu Job Mwamburi james onchieku Zachary Kinaro George Ogendi Jared Babu Nicholas Gichuru Department of Research Kenya Marine&Fisheries Research InstituteKisumu 1881-40100Kenya Faculty of Agriculture&Natural Resource Management Kisii 40840-200Kenya School of Spatial Planning&Natural Resource Management Bondo210-40601Kenya

Concentrations of OCP(Organochlorine Pesticide)residues were determined in cultured Nile tilapia(Oreochromis niloticus)fish in target stations within 1st order wetland of River Kuja,Kenya,between February-November,*** aim was to assess the residue levels in wild and pond cultured fish within a heavily populated agricultural area of South Western *** samples were analysed for selected HCHs(Hexachlorocyclohexane)isomers,DDT(Dichlorodiphenyltrichloroethane)and metabolites and cyclodienes pesticide residues using GC-ECD(Gas Chromatography Equipped with Electron Capture Detector).Most of OCPs observed were BDL(Below Detection Limit)to detectable *** percentages(>50%)of DDTs and HCHs were BDL and exhibited consistency,with significant(p<0.05)differences in mean contamination levels in fish within the wetland,with average muscle tissue pesticides concentrate ranging between 0.229-2.541mg/kg for Nile *** dominant isomer in target species was Lindane(g-HCH)(3.417±0.983mg/kg)and *** Endosulfan sulfate was 2.499±0.071mg/kg *** most frequently detected,and Methoxychlor(2.235±1.459mg/kg),*** Aldrin and Dieldrin was 2.028 and 0.574mg/kg *** for DDT and its metabolites was 0.27-3.71mg/kg for p,p’-DDE(DichlorodiphenylDichloroEthene),BDL-1.098 for p,p’-DDD(DichloroDiphenylDichloroEthane),and 0.105-3.518mg/kg for p,p’-DDT with significant differences in mean values and ranges whose levels were below the WHO(World Health Organization)maximum acceptable thresholds of 0.2,2,20 and 5.0mg/kg in fish and sea *** and monitoring need up-scaling in minimizing public health risks posed by consumption and exposure.

关键词： OCPs Oreochromis niloticus Lake Victoria Basin residues GC pesticides

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