By employing appropriate rates of stocking of Tilapia hybrids and carp determined by pond experiments, it was possible to increase the yields from the Kajansi ponds from 250–300 lbs/acre to 500–600 lbs/acre. The higher yield range compares well with the potential production determined for the ponds in Uganda by the late A.G. Wurtz (FAO/UN, 1961) and this was the first time that such high yields have been obtained in Kajansi.
The techniques of Tilapia hybridization evolved during the assignment at Kajansi were implemented successfully on a field scale at the existing fry centres. The demand from farmers for fry of Tilapia hybrids can now be met without difficulty by the centres.
The successful experiments in the control of frogs and insects in fish ponds have led to the yield of carp fry per female being increased in 1966 to 40,000 as against 300–400 in 1962–63. This increased rate of yield has enabled the production of fry economically and in sufficiently large numbers for commercial farming. It should now be possible to raise enough carp fry for stocking the Kigezi Lakes, where the survival of carp fry does not appear sufficient to maintain an exploited stock.
The successful results of experimental work on increased fry production at Kajansi have been applied at the regional fry centres. Hybridization pens and frog-proof ponds are now under construction at fry centres in Kigezi, Gulu and Bumageni, and when completed should serve to make these districts self-sufficient in Tilapia hybrids and carp fry.
