The lack of appropriate livestock feeds at affordable prices has greatly contributed to the slow pace of development in aquaculture and agriculture particularly in Uganda and other parts of the Eastern African region. A study was carried out to determine the nutrient composition of the May flies and growth and feed conversion rates of Clarias gariepinus stockers fed on mayflies, cassava and premix in relation to standard fish feeds in happas for 90 days. Proximate analysis of the dried powder was done using AOAC methods. The oil characterization was done using Blair and Drier methods. The design trial was a simple random and double blinded field controlled study. The stockers measuring10 gms and 13-15 cm were put in happas with a stocking density of 20 fingerlings per happa put two metres apart and the interventions were done in duplicates. The interventions involved the administration of feeds (type A, B and C). Feed type A was cassava only (used as the control); type B was cassava and mayflies (47.5% constant protein) and vitamins premix top up; and type C was standard feed. Vital parameters growth, feed gain ratio and feed conversion ratio were monitored. May flies had a crude protein of 72.00 ± 1.23% on dry weight basis as compared to Rastrineobola argentea (Haplochromines) (59%) the common source of protein in livestock feeds and were rich in the macro and microelements crucial in the growth of the fish hence was recommended as a suitable replacement for the fish meal. Feed type B accounted for the highest total weight gains (p
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