Oellermann, Lawrence Keith. Rhodes University; 1996. A comparison of the aquaculture potential of Clarias gariepinus (Burchell, 1822) and its hybrid with Heterobranchus longifilis valenciennes, 1840 in Southern Africa.
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Oellermann, Lawrence Keith. Rhodes University; 1989. The karyology and taxonomy of the southern African yellowfish (Pisces : cyprinidae).