Effects of dietary carbohydrate levels on growth, survival and body composition in Caspian Kutum (Rutilus frisii kutum, Kamenskii, 1901)

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Abstract

This study was carried out to evaluate the effects of dietary carbohydrate levels on growth
performance and body composition of juveniles Caspian Kutum (Rutilus frisii kutum). Fish
with initial average weight of 0.8±0.2g (±SD) were fed five isoproteic and isenergic
formulated diets with different carbohydrate levels including 15, 20, 25, 30 and 35% in
triplicate groups, 4 times daily according to their satiation for 10 weeks. Results showed that
increasing the level of carbohydrate to 35% significantly increase some growth indices such
as final weight (Wf), weight gain (WG), body weight increase (BWI), specific growth rate
(SGR) and protein efficiency ratio (PER). In addition, result of body composition analysis
showed that the increase in carbohydrate level lead to increase of protein level. So, the highest
amount of protein was observed in fingerlings fed with diet containing 35% carbohydrate. In
conclusion, the results indicate that increase in carbohydrate levels from 15 to 35% have not
any negative effect on growth parameters and therefore, the level of 35% carbohydrate in the
diet of 1-2g Caspian Kutum fingerlings can lead to better efficient in protein and desirable
growth.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 4 - Serial Number 81
May and June 2013
Pages 85-94

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