Africa and Eurasia: South Morocco, Sahara, Niger-Benue system, rivers Senegal, Sassandra, Bandama, Boubo, M?, Como?, Bia, Ogun and Oshun, Volta system, Chad-Shari system (Ref. 5163), middle Congo River basin in the Ubangi, Uele, Ituri and Itimbiri (Democratic Republic of the Congo), Lakes Albert (Ref. 55074) and Turkana, Nile system and the Jordan system (Ref. 5163). Several countries report adverse ecological impact after introduction.