The need for alternative, sustainably produced feed ingredients encourages the incorporation of insect meals and by-products in fish feed. Black soldier fly by-products are excellent fish feed ingredient candidates as they contain adequate protein s and lipids and are sustainably produced. The present study evaluated the growth performance of black soldier fly frass as a partial substitute for soybean meal in channel catfish diets . Three experimental diets were formulated to include a commercial black soldier fly frass at 0, 7.5, and 15%. Afterward , 50 Ictalurus punctatus fingerlings (average initial individual weight = 3.04 ± 0.07 g) were stocked into 15 glass aquaria within an indoor recirculating aquaculture system. Diets were randomly assigned to five replicate tanks, and the cat fish were fed to apparent satiation on a dry weight feed basis by feeding at a set percentage of biomass. The fish were weighed biweekly , and the feed ration was adjusted accordingly. The f eed ration was increased by 1-2% of the biomass on weeks when the fish were not weighed. At termination, fish were group-weighed and counted to evaluate growth and survival. No significant differences were observed among treatments in terms of final biomass, final average individual weight, weight gain (%), and survival (P>0.05) (Table 1). However, fish offered 7.5 and 15% black soldier fly frass in their diets had significantly smaller FCR than fish offered the basal diet (1. 40 and 1. 46 for 7.5 and 15% black soldier fly frass respectively, compared to 1.58 for the basal diet ). Results of the present study suggest that black soldier fly frass can be effectively used as a partial substitute for soybean meal in channel catfish diets without adverse effects on growth or survival. Black soldier fly frass can be used as a sustainably produced, nutritious, and environmentally friendly feed ingredient for channel catfish feed.