Assessment of Potentially Toxic Metals in Fish from Lake Manyara, Northern Tanzania
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Date
2023-09
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Springer US
Abstract
Elemental tracer concentrations of copper, lead, nickel and zinc, were assessed in the muscles of Oreochromis amphimelas
and Clarias gariepinus from Lake Manyara, Tanzania, to evaluate their safety to consumers, specifcally humans. Results
revealed that no elemental concentrations exceeded the FAO permissible levels, indicating fsh from all sites are safe for
human consumption. However, based on the highest found concentration of Pb, we recommend a maximum consumption of
2.2 kg of fsh from Lake Manyara per week. No signifcant diferences were observed in the metal concentrations between
the two fsh species, suggesting there is no bioaccumulation in the food chain. Moreover, no signifcant diferences were
found between fsh landing sites, indicating there are no regions in the lake with higher pollution. These fndings indicate
that PTM concentrations have not increased to toxic levels due to increased mobilisation from the catchment. Continued
monitoring of potential toxic metal concentrations in fsh is recommended due to endorheic nature of Lake Manyara and
increasing anthropogenic activities in its catchment area.
Sustainable Development Goals
This research article was published in Bulletin of Environmental Contamination and Toxicology, 2023
Keywords
East African Rift lakes, Energy dispersive X-ray fuorescence, Recommended weekly intake, Permissible levels, Zinc, Copper, Nikkel, Clarias gariepinus, Oreochromis amphimela