Effects of dietary lipid levels on growth, feed utilization, digestive tract enzyme activity and lipid deposition of juvenile Manchurian trout, Brachymystax lenok (Pallas)

文献类型： 外文期刊

第一作者： Chang, J.

作者： Chang, J.;Niu, H. X.;Li, S. G.;Jia, Y. D.;Xu, G. F.

作者机构：

关键词： fish nutrition; lipid requirement; Manchurian trout; metabolism

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

ISSN： 1353-5773

年卷期： 2018 年 24 卷 2 期

页码：

收录情况： SCI

摘要： Six isoproteic diets were designated to evaluate the effects of dietary lipid levels (from 70 to 270g/kg) on the growth performance, feed utilization, digestive tract enzyme activity and lipid deposition of juvenile Brachymystax lenok (average initial weight 0.54 +/- 0.04g). Each diet was fed to triplicate tanks (30 fish per tank) in an indoor closed recirculating system for 9weeks. Final body weight and weight gain were highest in fish fed 190g/kg diet and lowest in fish fed the 70g/kg diet. Specific growth rate of fish fed with 190g/kg diet was significantly higher than those fed with 70 and 270g/kg diets (p<.05). Protein efficiency ratio of fish fed with 70g/kg diet was significantly lower than the 110-230g/kg treatments and was not significantly different from the 270g/kg treatment. Fish fed with 270g/kg diet had significantly higher hepatosomatic index and viscerosomatic index than those fed with 70-190g/kg diets (p<.05). Intraperitoneal fat ratio and the whole-body lipid content had a trend to increase with increase in dietary lipid level. Muscle crude lipid content increased up to 190g/kg with increase in dietary lipid level. Lipid retention decreased with increase in dietary lipid level, while no significant differences in protein intake and retention levels were observed in fish among all treatments. Lipase activity of the mixture of pyloric caeca and foregut in fish fed 190 and 230g/kg diets was significantly higher than those fed 70 and 110g/kg diets. Midgut and hindgut lipase activities of fish were significantly higher than those fed the 190 and 230g/kg diets. In conclusion, based on the second-order polynomial model of WG and FCR, this study suggested that 173.8-195.0g/kg dietary lipid levels were appropriated for B.lenok.

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