Effect of Dietary n‐3 highly unsaturated fatty acids on Growth, Body Composition and Fatty Acid Profiles of Juvenile Black Seabream, Acanthopagrus schlegeli (Bleeker)

摘要: An 8-wk feeding trial was conducted to investigate the effects of dietary n-3 highly unsaturated fatty acids (n-3 HUFA) on growth, body composition, and acid profiles juvenile Acanthopagrus schlegeli. Three replicate groups fish (initial mean weight: 8.08 ± 0.09 g, ± SD) were fed diets with different levels HUFA (0.76%, HUFA0.76; 0.83%, HUFA0.83; 0.90%, HUFA0.90; 0.97%, HUFA0.97; 1.04%, HUFA1.04; 1.12%, HUFA1.12) at 12.9% total lipid, a constant eicosapentaenoic (EPA, 20:5n-3) docosahexaenoic (DHA, 22:6n-3) ratio about 2.1. Hepatosomatic index (HSI) intraperitoneal fat (IPF) all linearly depressed by (P < 0.05), condition factor (CF) not affected. Adipocyte diameter in IPF decreased elevation significance occurred between group HUFA0.90 HUFA1.12. Lipid content dorsal muscle significantly lowered compared diet HUFA0.76. No found whole proximate composition. In liver, IPF, ∑SFA, 16:0 or ∑n-3 positively correlated HUFA, while DHA EPA ratios remained 2.68, 2.86, 3.60, respectively. Fatty synthase (FAS, EC 2.3.1.85) activities treatments first then elevated higher than 0.97% 0.05). contrast, hormone sensitive lipase (HSL, 3.1.1.3) changed following an opposite tendency. Quadratic analysis based weight gain rate (WGR) indicated that requirement for black seabream 0.94% lipid diets.