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Dietary l ‐alanyl‐ l ‐glutamine supplementation improves growth performance and physiological function of hybrid sturgeon Acipenser schrenckii ♀ × A. baerii ♂
Author(s) -
Wang C.A.,
Xu Q.Y.,
Xu H.,
Zhu Q.,
Yang J.L.,
Sun D.J.
Publication year - 2011
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/j.1439-0426.2011.01673.x
Subject(s) - biology , sturgeon , glutamine , superoxide dismutase , amylase , lipase , alkaline phosphatase , malondialdehyde , protease , zoology , acipenser , weight gain , biochemistry , food science , endocrinology , enzyme , body weight , fishery , fish <actinopterygii> , antioxidant , amino acid
Summary Studies were conducted to demonstrate the effects of l ‐alanyl‐ l ‐glutamine (L‐AG) on the growth performance and physiological function of hybrid sturgeon Acipenser schrenckii ♀ × Acipenser baerii ♂ larvae. Five isonitrogenous experimental diets contained five different L‐AG levels: 0.0, 0.25, 0.5, 0.75 and 1.0%. Triplicate groups of 1500 fish (mean weight 0.42 ± 0.05 g) were stocked in each aquarium (220 L), which were connected to a recycling system and fed to apparent satiation for 56 days. When the culture experiment was terminated, weight gain, specific growth, survival and condition factor were determined and served as indices for assessing growth performance. Na + ‐K + ATPase, glutamine, superoxide dismutase (SOD), malondialdehyde (MDA), protease, lipase and amylase of the whole fish or intestine were also determined. The results showed that the growth performance improved significantly with increasing dietary L‐AG supplementation levels from 0.0 to 1.0%. Fish fed diets containing higher L‐AG level had greater Na + ‐K + ATPase, glutamine, SOD and lower MDA when the supplementation level increased. Compared to the control group, however, there were no significant differences in protease, lipase or amylase of the intestine. In conclusion, dietary L‐AG supplementation could help improving growth performance and physiological function of larval hybrid sturgeon.