Abstract: The study was conducted to find out the effects of Moringa oleifera leaves and seeds as a supplementary feed on the growth performance of all-male tilapia. The main objectives of the study were to determine effects of the supplementary feed (leaves + normal feed, seeds + normal feed, leaves + seeds + normal feed) on all male tilapia in terms of their average standard length, total length, standard width, total width and weight. The parameters for each of the treatments were measured fortnightly over the entire eight weeks period. The sample covered a total population of 260 fishes - 20 each from the hapa and 60 from each of the 4 ponds. The results revealed significant differences among the treatments (normal feed, leaves + normal feed, seeds + normal feed, leaves + seeds + normal feed) used on the parameters measured (average: standard length, total length, standard width, total width and weight) at (p < 0.05). The results clearly demonstrated that the seeds recorded higher (best growth) performance in terms of the parameters measured than all the other treatments administered. This was followed by combination of seeds and leaves with the normal feed only recording the least performance.