Abstract
Fermented mixture containing fish-offal meal (FOM) was used to partially replace fish meal (FM) in the formulation of diets for the freshwater catfish Mystus vittatus. The two supplementary diets, one containing 25% FM and 25% FOM (T2) and the other containing 20% FM and 30% FOM (T3) showed significantly higher (P < 0.05) digestibility, growth and protein deposition than the reference diet without FOM supplementation (T1, 40% FM). Digestive enzyme activities were correlated with the protein, carbohydrate and lipid levels in the diet. The fish fed diets containing FOM showed better lipid digestion efficiency than the reference group. It was concluded that fermented mixture containing FOM could be effectively used to partially replace fishmeal in the diet of M. vittatus.
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