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Protein-sparing effect of carbohydrate in diets for juvenile turbot Scophthalmus maximus reared at different salinities

文献类型： 外文期刊

作者： Zeng Lin 1 ; Lei Jilin 1 ; Ai Chunxiang 1 ; Hong Wanshu 1 ; Liu Bin 2 ;

作者机构： 1.Xiamen Univ, Coll Ocean & Earth Sci, Xiamen 361005, Peoples R China

2.Chinese Minist Agr, Natl Technol Syst Flatfish Culture Ind, Qingdao 266071, Peoples R China

3.Chinese Acad Fishery Sci, Qingdao Key Lab Marine Fish Breeding & Biol, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

关键词： Scophthalmus maximus;carbohydrate;salinity;protein-sparing effect;hepatic glycometabolism

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2015 年 33 卷 1 期

页码：

收录情况： SCI

摘要： The aim of the present study was to investigate the protein-sparing effect of carbohydrate in diets for juvenile turbot (Scophthalmus maximus) reared at five salinities (12, 18, 24, 30, and 36). The fish were fed three isocaloric and isolipidic diets for 60 days. The results show that specific growth rate (SGR) and feed conversion efficiency (FCE) were higher in fish reared at salinities of 18 and 36, but lower at 12. Fish fed with diet C25P40 (25% carbohydrate and 40% protein) had lower SGR and FCE values compared with those fed with the C5P52 (5% carbohydrate and 52% protein) and C15P46 (15% carbohydrate and 46% protein) diets; however, there was no statistical difference between diet C5P52 and C15P46. SGR and FCE values were unaffected by diet composition in fish reared at salinity 36. Hepatic lipogenic enzyme activities were higher in fish reared at 18 and 36, but lower at 12, while glucokinase (GK) activity was higher in fish reared at 12, and lower at 18 and 36. Dietary starch enhanced GK activity while depressing lipogenic enzyme activity. However, lipogenic enzyme activity increased with increasing dietary starch in fish reared at 36. It is recommended that salinity should be maintained >12 in the farming of juvenile turbot. In addition, an increase in gelatinized starch from 5% to 15% could spare 6% dietary protein in fish reared at salinities of 18-30, while higher salinity (36) could improve dietary carbohydrate use and enhance the protein-sparing effect, which is linked with the induction of lipogenic capacities.

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