Introduced to Lake Otjikoto, near Tsumeb, where its population is still increasing (Ref. 27829). Known from Lower Orange, Interior (Ref. 33857) and Fish River (Ref. 37620). Present in all major state dams: Hardap, Naute, Omatako, Otjivero, Swakoppoort and Von Bach (Ref. 33857, 52863), and the Cuvelai system (Omuramba Omatako and Owamboland); also collected from Goreangab Reservoir (Windhoek) (Ref. 52863). Poses a serious threat of genetic pollution in Kunene and Okavango rivers: breeds with O. andersonii (Ref. 246, 52863). First introduced into Namibia from the Cape in 1947 for angling/sport (Ref. 52863, 53015). Distribution in Namibian ephemeral rivers sporadic and depends on good rains (Ref. 52863). Also Ref. 2, 7248, 54854, 54974.