Clarias gariepinus which is an important angling and commercial fish in South West Africa was studied over a period of ten months. This species grows to a larger average size in the Hardap Dam than in most other waters studied. Keyword(s) : Breeding habits, Fecundity, Food, Gonads, Intestinal fat, Leech BatrocobdelIa tricarinata, Length- frequency distribution, Liver index, Maturity coefficients, Parasites, Spawning beds, Trematode Diplostomum mashonense.