Aquaculture America 2024

February 18 - 21, 2024

San Antonio, Texas

BLACK SOLDIER FLY FRASS AS PARTIAL SUBSTITUTE FOR SOYBEAN MEAL IN CHANNEL CATFISH Ictalurus punctatus DIETS

Magida Tabbara*, Abigea l Adeyemi,  D. Allen Davis,  Vikas Kumar, and Timothy J. Bruce 

 

School of Fisheries, Aquaculture and Aquatic Sciences 

Auburn University 

Auburn, AL 36849, 

mzt0083@auburn.edu

 




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.