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Growth, Body Composition, and Organoleptic Evaluation of Channel Catfish Fed Diets Containing Different Percentages of Distillers' Grains with Solubles

Juvenile channel catfish (Ictalurus punctatus) were stocked in twelve 1.25-m3 floating cages at densities of 320 fish/m3 and fed to satiety twice daily for 110 d with one of four diets. Each diet contained a certain percentage (0, 10, 20, or 30%) of distillers 1 grains with solubles (DCS), which partially replaced soybean meal and corn. Individual weights of fish, survival, food conversion (FC, weight of feed given/weight gain by fish), and body composition (percentage moisture, protein, fat, and ash) of waste (head, skin, and viscera) and dressed carcasses were not significantly different (P > 0.05) among treatments. Fish fed a diet containing 10% DCS (mean individual total length, 26.7 cm) were significantly shorter (P 0,05) from fish fed diets with 0 and 20% DCS. Average individual weight was 219 g, survival was 92.1%, and FC was 1.6. Percentage fat (dry-matter basis) in the carcasses of cage-reared channel catfish averaged 38%. Organoleptic evaluation of fillets indicated that the fat complex flavor was of significantly higher intensity (P < 0.05) in cage-reared fish than in pond-raised fish. However, Organoleptic evaluation indicated that DCS impart no adverse taste to channel catfish. These data indicate that DCS can be used in a least-cost diet formulation for channel catfish at rates of up to 30%. This option allows feed producers flexibility in diet formulations for commercial catfish diets. Least-cost diet formulations offer economic ad- vantages in the preparation of a nutritionally com- plete diet by allowing change in diet formulations when ingredient prices fluctuate. Evaluation of al- ternative protein sources remains a high priority for fish nutritionists. Distillers' grains with solu- bles (DGS) are primary fermentation residues from