A study to investigate the effects of three different stocking sizes (5, 10, 20 g) and two isonitrogenous input regimes (maize bran x urea and napier grass x urea) on the production of Oreochromis shiranus was conducted between June and November 2000 at the Malawi National Aquaculture Center. Six treatments (three stocking sizes x two input regimes), each in triplicate, were used in the study.