Dietary lipid and gross energy affect protein utilization in the rare minnow <i>Gobiocypris rarus</i> -- Journal of Oceanology and Limnology,2016,34(4):740-748

	Cite this paper:
	WU Benli, XIONG Xiaoqin, XIE Shouqi, WANG Jianwei. Dietary lipid and gross energy affect protein utilization in the rare minnow Gobiocypris rarus[J]. Journal of Oceanology and Limnology, 2016, 34(4): 740-748

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

WU Benli^1,2, XIONG Xiaoqin^1,2, XIE Shouqi³, WANG Jianwei¹

1 Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Science s, 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

Abstract:

An 8-week feeding trial was conducted to detect the optimal dietary protein and energy, as well as the effects of protein to energy ratio on growth, for the rare minnow (Gobiocypris rarus), which are critical to nutrition standardization for model fish. 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, specific 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 effect. Optimal protein decreased from 35% to 25%-30% with an increase in dietary lipid from 3% to 6% without adversely effecting growth. Dietary lipid level affects the optimal dietary E/P ratio. In conclusion, recommended dietary protein and energy for rare minnow are 20%-35% and 10-12.5 kJ/g, respectively.

Key words: rare minnow|Gobiocypris rarus|protein to energy ratio (E/P)|crude lipid|growth

Received: 2014-12-11 Revised: 2015-04-27

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