Dietary lipid to carbohydrate ratio in beluga, Huso huso (Linnaeus, 1758), fed two L‐carnitine levels
2014
Mohseni, M. | Pourkazemi, M. | Ozório, R. O. A.
A feeding experiment was carried out to determine the optimal dietary lipid: carbohydrate ratio (L:CHO, in %) on growth performance and feed efficiency in beluga, Huso huso (Linnaeus, 1758), juveniles fed two L‐carnitine supplementation levels. Triplicate groups (25 fish/tank) were fed one of eight isoproteic (41% crude protein) and isoenergetic (20 kJ kg⁻¹diet) diets with increasing L:CHO ratios (12 : 21, 15 : 16, 18 : 5 and 21 : 0) and one of two L‐carnitine supplements (0 or 300 mg kg⁻¹). Fish (initial body weight 480 ± 18.4 g) were housed in 24 fiberglass tanks and fed to apparent satiation for 114 days. Fish fed the 18 : 5: and 21 : 0 had higher weight gain, growth rate, feed conversion ratio and protein efficiency ratio than fish fed the other diets. Growth performance was significantly improved by supplementing 300 mg L‐carnitine to diets. Liver lipid increased with increasing dietary L:CHO ratios and decreased with dietary L‐carnitine level. These results indicated that juvenile beluga did not utilize dietary carbohydrate as efficiently as lipid. Moreover, diets with a dietary lipid:CHO ratio between 18 : 5 and 21 : 0 and supplemented with 300 mg L‐carnitine kg⁻¹successfully improved growth performance and feed utilization of beluga sturgeon reared in intensive culture conditions.
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