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《Marine Sciences》 2016-11
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Effect of feeding level on the growth and energy budgets of Epinephelus coioides juveniles cultured in low-salt water

HUANG Jian-sheng;WANG An-li;CHEN Gang;ZHANG Jian-dong;WANG Zhong-liang;TANG Bao-gui;Fishery College, Guangdong Ocean University;College of Life Science,South China Normal University;  
In this paper, we investigate the optimal feeding level of E. coioides juveniles cultured in low-salt water. We observed the effects of feeding levels(satiation, 4.25%, 3.79%, 3.31%, 2.83%, and 2.36%) on the growth and energy budget of these E. coioides juveniles(initial body weight 29.28 ± 2.63 g) cultured in low-salt water(salinity 12) at a temperature of 28 ±1℃; we fed them a formula diet and established the relationship between specific growth rate(SGR), feeding levels, and the energy budget. The results reveal that there was no significant difference in crude protein and ash contents in the groups of juveniles with P 0.05. The lipid contents of 3.79%, 4.25%, and satiation were significantly higher than those in the other feeding levels(P 0.05) after culturing for 56 d. The dry matter contents in the 4.25% and satiation groups were higher than those in the other groups. The energy content decreased significantly with a decrease in feeding levels. The feeding ratio of the juveniles was significantly affected by the feeding levels(P 0.05), and it decreased with a decrease in feeding levels. The specific growth rate in wet weight, dry weight, protein weight, and energy weight increased significantly with feeding levels. We found a logarithmic relationship between SGR and feeding levels. The feed conversion efficiency in wet weight, dry weight, and protein weight first increased and then decreased as feeding levels increased, and the maximum values were observed in the 3.79% group. However, the feed conversion efficiency in energy weight increased with feeding levels, and the maximum value was observed in the satiation group. With increasing feeding levels, the growth energy content(G) of the juveniles first increased and then decreased, and a quadratic relationship was found between G and the feeding levels. With increasing feeding levels, feces energy content(F) and excretion energy content(U) increased, and the maximum values were observed in the satiation group. There was a linear relationship between F, U, and the feeding levels. As the feeding levels increased, the metabolism energy content(R) of the juveniles decreased and tended toward stability. The maximum G was observed in the 3.79% group, and the optimal energy equation was 100.00 C = 12.29 F + 13.73 U + 31.33 R + 42.65 G. We consider the optimal feeding level to be 3.79% of the body weight of E. coioides juveniles cultured in low-salt water.
【Fund】: 广东高校优秀青年创新人才培养计划项目(2013LYM0038);; 广东省海洋与渔业科技项目(A2009-08D03、A2010-08D04);; 广东海洋大学“创新强校工程”项目(GDOU2016050251);广东海洋大学科研启动费项目(E15183)~~
【CateGory Index】: S965.334
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【Citations】
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