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The metals analyzed were Cadmium, Copper and Lead. All the selected metals were present in water, sediments and fish samples from all the study sites.
The heavy metal concentration in water does not exceed WHO guidelines. This finding was in agreement with (Ozturk., Ozozen., Minareshi., & Minareshi, 2009).
Cadmium concentration from Florema, Sher Karuturi, Flamingo and Malewa River exceed the WHO limits for sediments. Discussion already existing. The fish cadmium levels were lower than the WHO standards but the samples taken from Oserian and Sher Karuturi were close recording levels of 0.074 and 0.079 respectively. The finding is in agreement with the results of a study carried out in Awassa and Koka Lakes in Ethiopia where the Cadmium levels in sediments were higher than in fish samples (Dsikowitzky., Mengesha., Dadebo., Eduardo., Calvalho., & Sindern, 2012).
Copper is a vital element necessary for normal organism development, growth and metabolism. The uptake of Copper is regulated by physiological mechanisms according to nutritional demand through homeostatic control. At high concentrations, Copper becomes toxic to the body. Copper concentrations from Malewa River, Flamingo and Sher Karuturi exceed the WHO limits for sediment in contrast to (Ozturk., Ozozen., Minareshi., & Minareshi, 2009). Copper concentrationsin fish were below the WHO standards but samples from Malewa river, Flamingo, Florema were relatively high compared with the other sites. copper was also the most dominant metal in fish with the highest concentration (34.36) recorded at Malewa River
Lead concentrations in sediments were below WHO limits but samples from Malewa River, Oserian, Florema and Sher Karuturi recorded relatively high concentrations at 29.69,...

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...heavy metals in water samples and in fish tissues of edible fish species from Awassa and Koka Rift Valley Lakes, Ethiopia. Environmental Monitoring and Assessment .
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Ozturk., M., Ozozen., G., Minareshi., O., & Minareshi, E. (2009). Determination of heavy metals in fish, water and sediments of Avsar Dam Lake. Iran Journal of Environmental Health, Science and Engineering , 73-80.

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