Five Nile fish species Orechromis niloticus, Clarias lazera, Labeo niloticus, Synodontis and Bagrus bayad were collected from fish sources. Twenty
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LEVELS OF SOME ELEMENTS IN FISH
samples from each were weighed and muscles were digested, analyzed and calculated for cadmium, lead, fluorine, nickel, copper and manganese. The results revealed that the averages of the previously mentioned elements were 0.26, 0.33, 0.37, 0.33 and 0.39 ppm, 0.32, 0.45, 0.86, 0.64 and 0.12 ppm, 0.38, 0.20, 0.33, 0.12 and 0.16 ppm, 1.20, 2.48, 0.75, 0.83 and 0.84 ppm, 4.22, 5.55, 2.16, 3.78 and 1.68 ppm and 2.8, 3.2, 2.2, 2.9 and 1.2 ppm, respectively. The results indicate an increase of cadmium, lead levels and a slight increase in copper and nickel in fish muscles. The results are discussed with other previous reports and its hazardous health effects.