Distribution of trace elements in the aquatic ecosystem of the Thigithe river and the fish Labeo victorianus in Tanzania and possible risks for human consumption

High levels of As and Hg were observed in sediment. However, these sediment levels were not found to pose risk to the benthic aquatic fauna, since all elements were below the PEC values. For none of the measured metals human health risk by consumption of Ningu fish from the Thigithe river is likely to occur.193