Conjugated linoleic acid alters growth performance, tissue lipid deposition, and fatty acid composition of darkbarbel catfish (Pelteobagrus vachelli)
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- 作者：Gui-Fang Dong ; Wen-Zuo Liu ; Lin-Zhou Wu ; Deng-hang Yu…
- 关键词：Conjugated linoleic acid ; Lipid deposition ; Lipid metabolism enzymes ; Fatty acid composition ; Pelteobagrus vachelli
- 刊名：Fish Physiology and Biochemistry
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：41
- 期：1
- 页码：73-89
- 全文大小：661 KB
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- 刊物主题：Life Sciences
Hydrobiology
Animal Physiology
Animal Anatomy, Morphology and Histology
Animal Biochemistry
Zoology- 出版者：Springer Netherlands
- ISSN：1573-5168
文摘
Fatty liver syndrome is a prevalent problem of farmed fish. Conjugated linoleic acid (CLA) has received increased attention recently as a fat-reducing fatty acid to control fat deposition in mammals. Therefore, the aim of the present study was to determine whether dietary CLA can reduce tissue lipid content of darkbarbel catfish (Pelteobagrus vachelli) and whether decreased lipid content is partially due to alterations in lipid metabolism enzyme activities and fatty acid profiles. A 76-day feeding trial was conducted to investigate the effect of dietary CLA on the growth, tissue lipid deposition, and fatty acid composition of darkbarbel catfish. Five diets containing 0?% (control), 0.5?% (CLA0.5), 1?% (CLA1), 2?% (CLA2), and 3?% (CLA3) CLA levels were evaluated. Results showed that fish fed with 2-?% CLA diets showed a significantly lower specific growth rate and feed conversion efficiency than those fed with the control diet. Dietary CLA decreased the lipid contents in the liver and intraperitoneal fat with the CLA levels from 1 to 3?%. Fish fed with 2-?% CLA diets showed significantly higher lipoprotein lipase and hepatic triacylglycerol lipase activities in liver than those of fish fed with the control, and fish fed with 1-?% CLA diets had significantly higher pancreatic triacylglycerol lipase activities in liver than those of fish fed with the control. Dietary CLA was incorporated into liver, intraperitoneal fat, and muscle lipids, with higher percentages observed in liver compared with other tissues. Liver CLA deposition was at the expense of monounsaturated fatty acids (MUFA). In contrast, CLA deposition appeared to be primarily at the expense of MUFA and n-3 polyunsaturated fatty acids (PUFA) in the intraperitoneal fat, whereas in muscle it was at the expense of n-3 PUFA. Our results suggested that CLA at a 1?% dose can reduce liver lipid content without eliciting any negative effect on growth rate in darkbarbel catfish. This lipid-lowering effect could be in part due to an increment in the activity of lipid metabolism enzymes and an extensive interconversion of fatty acids. Although CLA deposition in muscle (0.66-.19?% of total fatty acids) are higher than presented in natural sources of CLA, EPA (C20:5n-3) in fish muscle appears simultaneously expendable, when the fish fed with 2-?% CLA.