Butter catfish (Ompok ceylonensis) is an underutilized endangered species in Sri Lanka and has not yet been introduced to aquaculture industry due to insufficient research data on hatchery rearing. Hence, in the present study, an attempt is made to observe GnRh induced breeding and rearing of larvae with phytogenic food additives. Brooders were successfully bred at Dambulla Fish Breeding Center using GnRh at a rate of 0.25ml/kg for males and 0.5ml/kg for females. The larvae were fed three types of formulated diets T1 (Moringa oleifera added), T2 (Alternanthera sessilis added) and T3 (control) at two-hour intervals throughout the day in replicate for three weeks. Specific growth rate, weight gain and survival rate were measured. Weight gain and specific growth rate (<0.05) were significantly increased in both feeds with added phytogenic additives. The highest survival rate was observed at T1 and the lowest at T2. In conclusion, it can be found that GnRh can be successfully used for butter catfish breeding and frequent feeding of compound feed with added Moringa and Alternanthera is advisable to improve growth as well as reduce cannibalism.