This research was conducted to investigate the e¡ect of stocking density on the growth performance and yield of Oreochromis niloticus in cage culture in Lake Kuriftu. The treatments had stocking densities of 50 (50F), 100 (100F), 150 (150F), and 200 (200F) ¢sh per m À 3 . All treatments were in duplicate. Juveniles with an average weight of 45. 76 AE 0.25 g were stocked in the treatments. The ¢sh were fed a composite mixture of mill sweeping, cotton seed, and Bora food complex at 2% of their body weight twice per day using feeding trays for 150 days in powdered form. The growth performance of O. niloticus was density dependent. The ¢nal mean weight of O. niloticus ranged 147.76 AE 0.28^219.71 AE 1.42 g and the mean daily weight gain was 0.69 AE 0.01^1.15 AE 0.02 g day À 1 . Fish held in cages with lower density were heavier than the ones held at higher densities, and showed higher weight gain and daily weight gain. The most e¡ective stocking density, in terms of growth parameters, was 50 ¢sh m À 3 . The gross yield (4.52 0.55 kg cage À 1 ) showed a signi¢cant di¡erence with increasing stocking density (Po0.05). Moreover, the apparent food conversion ratio (2.48^7.22) was signi¢cantly a¡ected by stocking density (Po0.05). However, survival rate was not a¡ected by stocking density (P40.05). It can be concluded that the most e¡ective stocking densities were at 50 ¢shm À 3 cage for larger size ¢sh demand in a short period and 200 ¢sh m À 3 for higher gross production with supplementary feed.
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