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《Chinese Journal of Fisheries》 2009-01
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The effect of dietary fat levels on growth and digestibility in juvenile discus Symphysodon aequifasciata

WANG Ji-qiao1, GENG Jia-zhen1, JIANG Yu-sheng1, HUANG Yan-ping2 (1. Life Science and Technique Institute, Dalian Fisheries University, Dalian 116023, China;2. Beijing Fisheries Institute, Beijing 100018, China)  
A feeding experiment was conducted to evaluate the effect of different dietary fat levels on growth performance and digestibility in discus Symphysodon aequifasciata juveniles weighing 8-10 g. The juveniles were stocked into 15 plastic tanks of each 54cm×40cm×28cm and fed isonitrogenous semi-purified diets containing 45.0% protein with fish meal, and soybean meal as protein sources, and lipid levels of 10.21%, 12.02%, 17.17%, 21.0%, and 22.14% with soybean oil as lipid sources for 90 days at water temperature of 29.0±1.0℃. During the experiment, survival ranged from 96.67% to 100.0% without significant different (P 0.05). The specific growth rate (SGR), protein efficiency ratio (PER), and relative weigh gain (RWG) increased first and then decreased as the dietary fat levels increased. The juveniles fed the diets containing 12.02% fat had very significantly higher SGR, PER, and RWG than the fish fed the dietary fat levels of 10.22% and 22.14% (P0.001).There were no significant differences in SGR, PER, and RWG in the juveniles fed the diets containing 17.17% and 21.05% compared with the fish fed the dietary fat levels of 12.02% fat (P 0.05). The maximal protein digestibility was observed in the juveniles fed the diets containing 12.02% fat and there were no significant differences in protein digestibility in the fish fed the dietary fat levels of 10.22%, 12.02% and 17.17% (P0.05), indicating the optimal dietary fat ranged from 12.02% to 17.17% for discus juveniles.
【Fund】: 辽宁省重点科技项目:北方淡水优质野生经济鱼类高效养殖技术研究(2004203002)
【CateGory Index】: S965.8
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