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Partial replacement of fishmeal by brewer's yeast (Saccharomyces cerevisiae) in the diets of Thai Panga (Pangasianodon hypophthalmus × Pangasius bocourti)
- Pongpet, J., Ponchunchoovong, S., Payooha, K.
- Aquaculture nutrition 2016 v.22 no.3 pp. 575-585
- Pangasianodon hypophthalmus, Pangasius bocourti, Saccharomyces cerevisiae, blood, brewers yeast, cages, complement, experimental diets, feed conversion, fish, fish culture, fish meal, growth performance, hematology, immune response, immunoglobulins, juveniles, lysozyme, meat quality, specific growth rate, weight gain
- Feeding trials were carried out to evaluate the efficacy of the replacement of fishmeal with brewer's yeast (Saccharomyces cerevisiae) in the diets of Thai Panga (Pangasianodon hypophthalmus × Pangasius bocourti). Thai Panga juveniles with an average initial weight of 36.4 ± 0.07 g were randomly stocked in cages (1 × 1 × 1.5 m³) at a rate of 40 fish per cage. Experimental diets were formulated to provide isonitrogenous (320 g kg⁻¹ CP) and isocaloric (15.30 kJ g⁻¹) diets, by increasing brewer's yeast levels to replace 30%, 45%, 60% or 75% of dietary fishmeal. The control groups were comprised of the commercial feed (CA) and the basal diet without brewer's yeast (CB). Fish were rearing for 9 months. The final weights, weight gains, specific growth rate and daily growth rate showed that brewer's yeast can be used effectively as a substitute for up to 45% of the fishmeal. The replacement of fishmeal by brewer's yeast did not affect the feed efficiency, blood haematology and meat quality (P > 0.05). Alternative complement activity (ACH50), lysozyme activity and total immunoglobulin (Ig) in the fish in groups that had replacement feed diets were significantly higher than those of control group. Replacing 45% of fishmeal with brewer's yeast can improve the growth performance and immune response of the Thai Panga.