Effect of feeding rate on growth performance, carcass composition and digestibility of in beluga (Huso huso)

Document Type : Tarvij

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Fish Nutrient Expert

Abstract

The present study was done to evaluate the effect of four different feeding rates including 0.5 (maintenance), 1(medium), 1.5 (satiety levels) and 2 (satiation levels) on the growth factors, carcass composition and digestibility of beluga (Huso huso). 180 fish with the average weight of 121.7 ± 9.6 g were randomly distributed into 12 fibreglass tanks with 2000 litre capacity. Each tank was included by 15 fish and three replicates were assigned to each treatment randomly. Then, each treatment was fed for a period of 12 weeks. Average final weight, weight gain (WG), specific growth rate (SGR) and protein efficiency ratio (PER) of fish fed 1.5 and 2 % of body weight were significantly (P < 0.05) higher than those of fish fed other feeding rates. The highest feed conversion ratio (FCR) was observed at a ratio of 0.5 % body weight. Whole-body crude protein and lipid concentration increased with dietary feeding rates while the body moisture showed a reduction with increasing the feeding rate. The digestibility measurements showed that feeding levels significantly changed digestibility of protein, lipid, energy and dry matter in beluga (p<0.05). Although the satiation feeding was followed by a maximum growth, the feed efficiency reduction and contaminant increase was observed. Considering the relation between feed consumption and digestibility efficiency, the obtained results may support the theory that cultural young Beluga manage the energy and nutrients intake by digestibility efficiency. Based on the obtained results through this study, it can be declared that feeding juvenile Beluga by 1.5% of body weight is of great importance in order to reach the maximum growth, apparent digestibility and optimum carcass combination, which beside reducing potential contamination in rearing environment, it also can be an economic benefit for farmers

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