Evaluation of Dry Extrusion-Cooked Protein Mixes as Replacements for Soybean Meal and Fish Meal in Catfish Diets

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Abstract
Five isonitrogenous and isocaloric diets containing extrusion-cooked protein mixes were fed to fingerling channel catfish in aquaria for 9 weeks. Soy-mix, soy-liquid fish, soy-catfish scrap and soy-mix plus catfish meal replaced soybean meal and fish meal in the basal diet. Weight gains of channel catfish that received diets containing protein mixes were significantly higher than those of fish fed the basal diet except for fish fed soy-liquid fish. Feed conversions of fish fed soy-mix and soy-mix plus catfish meal were significantly improved compared to those of fish fed the basal diet. Protein and fat gains were generally higher in fish fed the extruded mixes as compared to those of fish fed the basal diet. Whole body proximate composition (dry weight basis) indicated that fish fed the extrusion-cooked protein mixes contained less moisture and protein, and more fat than fish fed the basal diet. Protein efficiency ratios (determined utilizing low protein diets) indicated that fish fed the extrusi...