Essential Minerals and Trace Elements in Muscle Tissue of Three Fish Species from Lake Tana, Ethiopia
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amples of three fish species namely Oreochromis niloticus (Nile tilapia), Clarias gariepinus (Catfish), and labeobarbus (‘Nech assa’) collected from three sample sites of Lake Tana, Ethiopia were analyzed for their level of some essential trace metals. The edible tissues of the fishes were isolated, frozen and dried until constant weight obtained. Then 2 g of dry powder fish tissue was refluxed for 7.0 hours with 8.0 ml of 70% HNO3, 2.0 ml of 98% H2SO4 and 10 ml of 35% H2O2. The obtained extract was analyzed for Calcium (Ca), Iron (Fe) and Zinc (Zn) content by atomic absorption spectrophotometer (AAS). The recovery for the three metals was ranged from 89.4% to 107.2% in spiked fish samples. Results of these trace metal concentrations (μg metal/g dry mass) in the three fish species applying external calibration curve ranged Ca: 384.1 545.7, Fe: 93.1 -198.8 and Zn: 2.1 - 14.1 in Tilapia; Ca: 462.4 - 507.3, Fe: 39.8 - 167.5 and Zn: not detected (ND) - 5.5 in catfish; and Ca: 542.2- 589.4, Fe: 51.2 - 109.7 and Zn: ND - 6.3 in labeobarbus were obtained. Although a significant variation was noticed within a fish species and in different species, fish from Lake Tana, labeobarbus relatively had better calcium content whereas Clarias gariepinus (Catfish) was good sources of iron and zinc content nutrients.
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