Dietary lipid and gross energy affect protein utilization in the rare minnow Gobiocypris rarus  

作　　者：吴本丽 熊小琴 解绶启 王剑伟 

机构地区：[1]Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

出　　处：《Chinese Journal of Oceanology and Limnology》2016年第4期740-748,共9页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Key Technology R&D Program of China(No.2011BAI15B01-41);the National High Technology Research and Development Program of China(863 Program)(No.2012AA06A302)

摘　　要：An 8-week feeding trial was conducted to detect the optimal dietary protein and energy, as well as the ef fects of protein to energy ratio on growth, for the rare minnow( Gobiocypris rarus), which are critical to nutrition standardization for model fi sh. Twenty-four diets were formulated to contain three gross energy(10, 12.5, 15 kJ/g), four protein(20%, 25%, 30%, 35%), and two lipid levels(3%, 6%). The results showed that optimal dietary E/P was 41.7–50 kJ/g for maximum growth in juvenile rare minnows at 6% dietary crude lipid. At 3% dietary lipid, specifi c growth rate(SGR) increased markedly when E/P decreased from 62.5 kJ/g to 35.7 kJ/g and gross energy was 12.5 kJ/g, and from 75 kJ/g to 42.9 kJ/g when gross energy was 15.0 kJ/g. The optimal gross energy was estimated at 12.5 kJ /g and excess energy decreased food intake and growth. Dietary lipid exhibited an apparent protein-sparing eff ect. Optimal protein decreased from 35% to 25%–30% with an increase in dietary lipid from 3% to 6% without adversely ef fecting growth. Dietary lipid level af fects the optimal dietary E/P ratio. In conclusion, recommended dietary protein and energy for rare minnow are 20%–35% and 10–12.5 k J/g, respectively.An 8-week feeding trial was conducted to detect the optimal dietary protein and energy, as well as the ef fects of protein to energy ratio on growth, for the rare minnow（ Gobiocypris rarus）, which are critical to nutrition standardization for model fi sh. Twenty-four diets were formulated to contain three gross energy（10, 12.5, 15 kJ/g）, four protein（20%, 25%, 30%, 35%）, and two lipid levels（3%, 6%）. The results showed that optimal dietary E/P was 41.7–50 kJ/g for maximum growth in juvenile rare minnows at 6% dietary crude lipid. At 3% dietary lipid, specifi c growth rate（SGR） increased markedly when E/P decreased from 62.5 kJ/g to 35.7 kJ/g and gross energy was 12.5 kJ/g, and from 75 kJ/g to 42.9 kJ/g when gross energy was 15.0 kJ/g. The optimal gross energy was estimated at 12.5 kJ /g and excess energy decreased food intake and growth. Dietary lipid exhibited an apparent protein-sparing eff ect. Optimal protein decreased from 35% to 25%–30% with an increase in dietary lipid from 3% to 6% without adversely ef fecting growth. Dietary lipid level af fects the optimal dietary E/P ratio. In conclusion, recommended dietary protein and energy for rare minnow are 20%–35% and 10–12.5 k J/g, respectively.

关 键 词：rare minnow Gobiocypris rarus protein to energy ratio（E/P） crude lipid GROWTH 

分 类 号：S965[农业科学—水产养殖]