Journal of Fisheries Science and Technology

Journal of Fisheries Science and Technology

The effect of different levels of protein and carbohydrate to lipid ratio on growth rate and body composition of farmed juvenile Huso huso

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Abstract
A 4 × 4 factorial design was conducted to quantify the optimumrncarbohydrate ⁄ lipid ratio to minimize the dietary protein level in growingrnbeluga, Huso huso (initial weight 891.9 ± 33.4 g, mean ± SD). Fish were fedrnwith sixteen experimental diets formulated to contain four protein levels (35,rn40, 45 and 50%) and four dietary carbohydrate ⁄ lipid ratios of 0.8, 1.1, 1.4,rnand 1.7 for 108 days. At the end of trial, there were no significant differencesrnin growth parameters among fish fed with 35, 40 and 45% protein levels. Nornsignificant difference in growth parameters and feed efficiency (FE) wasrnalso observed when dietary carbohydrate ⁄ lipid ratios decreased from 1.7 torn1.1 within the same energy level (P > 0.05). The highest carcass proteinrncontent was observed in fish fed 0.8 and 1.4 carbohydrate to lipid ratio (P
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