Effects of Dietary Carbohydrate-to-Lipid Ratios on Growth and Body Composition of Fingerling Channel Catfish

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Abstract
Eight isonitrogenous, isocaloric semipurified diets were formulated with varying levels of digestible carbohydrate (white dextrin) and lipid (salmon-oil — corn-oil mixture) to determine the effect of each as energy sources for fingerling channel catfish (Ictalurus punctatus). After an initial 2-wk conditioning period, the experimental diets were fed in triplicate to groups of channel catfish fingerlings weighing 201 ±2 g per 110-liter flow-through aquarium. The diets were fed at a rate of 3% of the total wet weight of fish per day, divided into three equal feedings and adjusted weekly for 9 weeks. At the end of the feeding period no significant differences were observed in the growth rates, feed conversion, protein deposition, or energy retention of fish fed diets containing carbohydrate-to-lipid ratios (CHO:L) of 0.45 to 4.5. The observed effects of dietary CHO:L ratio on liver histology and on liver and carcass composition had no adverse effects on growth rates or feed conversion. These data in...

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