FISH MEAL REPLACEMENT BY MICROBIALLY FERMENTED BLACK SOLDIER FLY (Hermetia illucens) LARVAE MEAL IN DIETS FOR JUVENILE MIXED SPECIES TILAPIA (Oreochromis niloticus/O. aureus)

Date
2023-12
Authors
Dye, Matthew
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García-Ortega, Armando
Department
Tropical Conservation Biology & Environmental Science
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One of the primary objectives of sustainable aquaculture is to reduce the use of marine resources like fish meal (FM) and fish oil (FO) traditionally utilized in aquafeeds. A promising alternative protein source used for aquafeeds is the protein meal from the black soldier fly larvae (BSFL), though, presently, full replacement of protein from FM with insect meals has not been achieved. This study aimed to elucidate the potential of kōji (Aspergillus oryzae) fermented black soldier fly larvae (fBSFL) meal to replace FM at cumulative substitution levels in diets for juvenile mixed sp. tilapia (Oreochromis niloticus/O. aureus). A Control diet (FM-100) based on commercially produced FM was used as a reference and three experimental diets were prepared to replace FM with fBSFL meal at levels of 10% (INS-LOW), 25% (INS-MED), and 50% (INS-HIGH), respectively. All diets were formulated to contain 45% crude protein and 10% crude lipid. A fish feeding trial in a recirculating aquaculture system was performed. The diets were fed to triplicate groups of 10 fish (0.5 ± 0.0 g) twice a day for 57 days. Final fish weight, specific growth rate (SGR), and survival of mixed sp. tilapia fed the experimental diets showed no significant differences (P > 0.05) compared to the Control diet. There were significant correlations (P < 0.05) in total omega-3 (n-3) fatty acids (FA) between diets and fish whole body FA composition. The results of this study suggest that the replacement of up to 50% of FM with fBSFL in diets for juvenile mixed sp. tilapia does not significantly affect fish growth, SGR or survival rate. Further studies should evaluate the refinement and digestibility of fBSFL proteins used in this study to optimize feeds for juvenile mixed sp. tilapia.
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Agriculture, Aquatic sciences, Environmental science, aquaculture, aquafeeds, black soldier fly larvae (BSFL), fish meal, insect meal, kōji fermentation
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70 pages
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