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Dietary lipid to carbohydrate ratio in beluga, H uso huso ( L innaeus, 1758), fed two L ‐carnitine levels
Author(s) -
Mohseni M.,
Pourkazemi M.,
Ozório R. O. A.
Publication year - 2014
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12567
Subject(s) - huso , beluga , biology , feed conversion ratio , carbohydrate , protein efficiency ratio , carnitine , zoology , juvenile , sturgeon , weight gain , food science , fish <actinopterygii> , fishery , body weight , biochemistry , endocrinology , ecology
Summary 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, H uso huso ( L innaeus, 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 −1 diet) 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 −1 successfully improved growth performance and feed utilization of beluga sturgeon reared in intensive culture conditions.