Citation: G. Degraaf et al., RECRUITMENT CONTROL OF NILE-TILAPIA, OREOCHROMIS-NILOTICUS, BY THE AFRICAN-CATFISH, CLARIAS-GARIEPINUS (BURCHELL 1822), AND THE AFRICAN-SNAKEHEAD, OPHIOCEPHALUS-OBSCURIS .1. A BIOLOGICAL ANALYSIS, Aquaculture, 146(1-2), 1996, pp. 85-100