Distribution
Africa: Native in all the basins of the Sahelo-Sudanese region, the Senegal, Gambia, Corubal, Volta, Ou?m?, Niger, B?noue, Chad and Nile basins and Lake Turkana. Successful introductions in the storage reservoirs of C?te d'Ivoire, the Cross, Sanaga, Nyong and Ogowe rivers and lower and Middle Congo basin, including Ubangui and Kasa?. Also introduced in Madagascar. Several countries report adverse ecological impact after introduction.