title: Organochlorine pesticides and heavy metals in fish from Lake Awassa, Ethiopia: Insights from stable isotope analysis.
abstract: The levels and bioaccumulation of organochlorine pesticides (OCPs) and heavy metals were studied in muscle and liver of three fish species, with two trophic levels, from Lake Awassa, Ethiopia. DDTs were the predominant organic pollutant in all species with a maximum level of 73.28 ng g(-1) wet weight (ww). p,p'-DDE was the predominate congener and showed a significant (p<0.001) relationship with δ(15)N, which indicates that DDTs could biomagnified in the food web of the lake. Generally, high levels of heavy metals (Cd, Co, Cr, Cu, Ni, Pb, Zn and Hg) were found in liver samples as compared to muscles. The levels of Cd, Co, Cu, Ni, and Pb in liver samples showed negative correlation with δ(15)N. They were found markedly higher in the lower trophic level fish species (p<0.05) that indicates biodilution whereas; Zn level showed positive correlation with δ(15)N.
authors: Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo, Japan.
authors: Yared Beyene
authors: YB
authors: Yohannes
authors: Yoshinori
authors: Y
authors: Ikenaka
authors: Shouta M M
authors: SM
authors: Nakayama
authors: Aksorn
authors: A
authors: Saengtienchai
authors: Kensuke
authors: K
authors: Watanabe
authors: Mayumi
authors: M
authors: Ishizuka
mesh_terms: D000818:Animals; D004435:Eating; D004784:Environmental Monitoring / Q000379:methods*; D005002:Ethiopia; D005399:Fishes; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D007554:Isotopes; D060106:Lakes / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D007554:Isotopes; D019216:Metals, Heavy; D010575:Pesticides; D014874:Water Pollutants, Chemical