The lakes formed by large power dams are populated by basically riverine faunas.
The African Great Lakes are populated by highly specialized endemic faunas containing
the bulk of the world's lacustrine fish species. Examples from the fauna of Lake Malawi
are considered to illustrate the utilization of various niches, and it is suggested
that such specialized species should be introduced into large tropical impoundments
to utilize niches probably not fully occupied at present. Such introductions would pose
little threat to the ecosystem of the rest of the river system into which they are
introduced because of their close specialization to lacustrine conditions.