The Biology and Culture of Tilapias

construction of the Kariba and Cabora Bassa dams, S. andersonii has been

recorded in the Middle Zambezi (Balon 1974; Jackson and Rogers 1976).

Figure lb. Substrate-breeding tilapias: natural distribution and
dageti, T. mariae, T. congica and T. spamanii.

DISTRIBUTION OF RENDALLZ AND SPARRMANZZ

introductions of T.

The distribution of these species is quite similar and quite 'Zambezian'.

The presence of T. rendalli and T. spamanii in the Zake basin can be

explained by the capture of a number of rivers in the Zambezi system by the

Zaike river and its tributaries in Shaba and Kasai. But while T. spamanii

could not colonize the Lualaba below the Kongolo (probably because of the

high temperatures), T. rendalli has colonized the Lualaba to the limits of its

basin. Also it has colonized the Tanganyika basin and its tributaries, via the

Likuga. T. rendalli possibly came into Lake Tanganyika after the penetration

by S. niloticus, which came from Lake Kivu after the latter was captured by

the Ruzizi.