Reuse of spent brewer’s yeast to produce a South American freshwater prawn: effects on growth performance, amino acid profile, proximate and elemental composition, and egg development

CARVALHO, DÉBORA A.; REYES, PAULA S.; CALVO, NATALIA S.; MORA, MARÍA CELESTE; DE BONIS, CRISTIAN; COLLINS, PABLO A.

AQUACULTURE INTERNATIONAL

SPRINGER

Año: 2023

0967-6120

The availability of resources for aquafeed production is one of the main constraints thatcould hinder the rapid expansion of aquaculture. Our aim was to investigate the inclusionof spent brewer’s yeast as an ingredient in aquafeeds and evaluate the zootechnicalperformance, proximate and elemental body composition, amino acid profile, and eggdevelopment of the freshwater prawn Macrobrachium borellii. We fed juvenile prawnswith three feeds: D18, D25, and D32, which represent 18%, 25%, and 32% inclusion ofSBY as a partial substitute for FM, respectively, during a 75-day trial. Prawns cultivatedwith D18 exhibited higher growth increment (97.73 ± 7.30%), specific growth rate(0.39 ±0.02%), and protein efficiency ratio (0.27± 0.04%) than other treatments. However,the total biomass produced, as well as the proximate and elemental body composition ofprawns, was similar across treatments. The most abundant essential amino acids in theprawn’s body were arginine, leucine, and lysine while feeds showed good quality despitethe limitations of arginine and phenylalanine. We observed successful hatching whenprawns were fed with feed containing more SBY, indicating a more successful reproductivestock. Farming prawns with feeds containing different inclusion percentages of SBY isfeasible. The inclusion of this raw material in high replacement percentages (up to 50%) isviable and could promote the bioeconomy by utilizing discarded local raw material insteadof wild-caught resources.