Effects of dietary lipid levels on growth performance,feed utilization and fatty acid composition of juvenile Japanese seabass (<Emphasis Type="Italic">Lateolabrax japonicus</Emphasis>) reared in seawater |
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Authors: | Jian-He Xu Jie Qin Bin-Lun Yan Ming Zhu Gang Luo |
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Institution: | (1) Huaihai Institute of Technology, Key Laboratory of Marine Biotechnology of Jiangsu Province, Lianyungang, 222005, People’s Republic of China;(2) Aquaculture Department, Su Zhou University, SuZhou, 215104, People’s Republic of China; |
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Abstract: | Triplicate groups of 40 Japanese seabass Lateolabrax japonicus (initial weight, 11.3 ± 0.4 g) reared in seawater (salinity, 30.0–33.0 g L−1) were fed with five isonitrogenous (41.3 ± 0.2% crude protein) and isoenergetic (18.5 ± 0.3 MJ kg−1) experimental diets formulated with increasing lipid levels (4.3, 8.4, 12.2, 15.8 and 20.1% lipid) for 10 weeks. Survival
throughout the feeding experiment ranged from 87.5 to 100%, but the survival of fingerlings fed with the 4.3% lipid diet was
significantly lower than the rest of the diets. At the end of the feeding experiment, fish fed with 12.2% lipid diet showed
optimal growth performance (P < 0.05). Lipid contents of whole body, liver and muscle increased in parallel with the increase in dietary lipid levels.
Viscerosomatic index (VSI), hepatosomatic index (HSI) and muscle lipid content were higher in 20.1% lipid group than those
in the rest of the lipid level groups indicating that viscera and muscle tissues played important contributions to body lipid
deposition. High proportions of 18:1n-9, eicosapentaenoic acid (20:5n-3; EPA) and docosahexaenoic acid (22:6n-3; DHA), and
low concentrations of n-6 polyunsaturated fatty acids (PUFAs) occurring in liver and muscle, to some extent, reflected fatty
acid (FAs) composition in the experimental diets. |
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