Technical basis for the small-scale production of black soldier fly, Hermetia illucens (L. 1758), meal as fish feed in Benin
Armel Gougbedji | Pamphile Agbohessou | Philippe A. Lalèyè | Frédéric Francis | Rudy Caparros Megido
Promoting black soldier fly (BSF) rearing in Benin to replace fishmeal in fish diet could reduce fish production costs. This study aims to set up a breeding technique of BSF as a protein source. BSF reproduction has been carried out in sunlight. Two densities (8500 individuals/m3 and 10,500 individuals/m3) associated with 2 attractants (soybean and pineapple waste) were tested on imago egg-laying. A larvarium with a prepupae self-harvesting system was designed and its efficiency was evaluated by testing 3 densities of larval rearing (1 larva/g, 2 larva/g, 3 larva/g). Two diets, VGD (soybean meal + euphorbia leaves and seeds + colza oil) and FOD (soybean meal + fish offal) were formulated to optimize polyunsaturated fatty acid profile of prepupae to meet nutritional requirements of tilapia. Best oviposition was obtained with 8500 individuals/m3 with pineapple waste and optimal larval load density was 2 larva/g. Prepupae fed with VGD accumulated C18:2n-6 (10.1%) which is essential for tilapia. Prepupae fed with FOD contained C20:5n-3 (2.20%), a fatty acid beneficial to humans. The lowest production cost of BSF meal was estimated at $1.84/Kg and was obtained with the FOD diet. BSF can easily be reared under local conditions throughout the year. Its nutritional qualities are very interesting to meet Nile tilapia requirements.
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