TABLE 2 

Toxic metal levels in commonly consumed fish in the Mwanza region

SpeciesMetal levela (ng/g) in fish
MercuryLeadArsenicCadmium
Tilapia (Oreochromis niloticus)18.3 ± 17.158.0 ± 13.022.3 ± 2.5158 ± 254
Nile perch (Lates niloticus)56.0 ± 15.186.7 ± 18.230.3 ± 14.333.7 ± 37.5
Silver cyprinid (Rastrineobola argentea)77.3 ± 40.578.0 ± 18.3664.3 ± 159.9113.0 ± 54.7
  • a Data are means ± SD. Mercury and arsenic levels are reported as total levels (i.e., sum of inorganic and organic metal species).