Abstract
Abstract Conjugated linoleic acid (CLA) has been shown to decrease body fat and increase lean tissue in mammals. However, limited data is available about the effect of CLA on the lipid content in fish tissue, and the mechanisms underlying the beneficial effects of CLA in fish are unknown. We hypothesized that dietary CLA may induce lipid-lowering effects in grass carp ( Ctenopharyngodon idella ) tissue, and the fat reduction effect was modulated by the expression of genes involved in the lipid metabolism. A 65-day growth trial was conducted to investigate the effect of CLA on the growth, tissue lipid deposition, and gene expression involved in the lipid metabolism of grass carp. Seven isonitrogenous and isolipidic diets were formulated: 0% CLA (control); 0.5% CLA (CLA0.5); 1% CLA (CLA1); 1.5% CLA (CLA1.5); 2% CLA (CLA2); 2.5% CLA (CLA2.5); and 3% CLA (CLA3). Results showed that only fish fed the CLA3 diet exhibited a significant reduction in feeding rate and specific growth rate than those of fish fed the control diet ( P P
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