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首页> 外文期刊>Aquaculture International >Effect of dietary lipid level on growth performance, feed utilization and body composition of grouper Epinephelus coioides juveniles fed isonitrogenous diets in floating netcages.
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Effect of dietary lipid level on growth performance, feed utilization and body composition of grouper Epinephelus coioides juveniles fed isonitrogenous diets in floating netcages.

机译：日粮脂质水平对漂浮网箱中饲喂等氮日粮的石斑鱼石斑鱼幼鱼的生长性能，饲料利用率和身体组成的影响。

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摘要

An experiment was conducted to determine the effect of dietary lipid levels on growth performance and body composition of grouper Epinephelus coioides juveniles cultured in floating netcages (1.5 m x 1 m x 1.5 m). Six isonitrogenous diets (53% dietary protein) with increasing dietary lipid concentration (5.16, 7.38, 9.73, 12.36, 14.13, 16.04% of dry material, DM) were fed to satiation to triplicate groups of 20 fish (mean weight: 10.9+or-0.1 g) for 56 days. Dietary energy levels were 300, 322, 340, 371, 382, 400 kcal/100 g DM, respectively. Fish fed the 9L diet had the highest weight gain (WG) and specific growth rate (SGR), but they were not significantly different from that of fish fed the 7L or 12L diet (p>0.05). FI varied inversely with dietary lipid levels. The poorest FCR and the lowest PER were observed in fish fed the 5L diet but these parameters showed no significant differences (p>0.05) for fish fed the dietary lipid level ranging from 9 to 16%. Nitrogen intake decreased with dietary lipid levels. Fish fed the 7L diet showed the highest N gain, which was not markedly different from that of fish fed the 9L and 12L diets (p>0.05). N retention was significantly lower in fish fed the 5L diet than in the other groups. Lipid intake and lipid gain increased with dietary lipid levels. Lipid retention (%) of the 7L diet was lowest but showed no significant differences among other treatments (p>0.05). Proximate composition of fish body was significantly affected by dietary lipid level (p<0.05). Body lipid content increased in direct proportion to dietary lipid levels. In contrast, moisture content of whole-body was correlated negatively to dietary lipid level. Dietary lipid content had no significant effect on protein content in whole-body and white muscle (p>0.05). Condition factor (CF), hepatosomatic index (HSI) and viscerosomatic index (VSI) increased with increasing dietary lipid level. Based on second-order polynomial regression analysis of WG against dietary lipid level, a breakpoint of 10.0% was indicated to be the optimal dietary lipid concentration for maximum growth for grouper Epinephelus coioides juveniles cultured in floating netcages.
机译：进行了一项实验，以确定饮食脂质水平对在浮式网箱（1.5 m x 1 m x 1.5 m）中养殖的石斑鱼石斑鱼的生长性能和身体组成的影响。六种同等氮饲料（53％的日粮蛋白质），其日粮脂质浓度增加（干物质DM的5.16、7.38、9.73、12.36、14.13、16.04％，DM）饱食，一式三份，每组20条鱼（平均体重：10.9+或-0.1 g），持续56天。饮食能量水平分别为300、322、340、371、382、400 kcal / 100 g DM。饲喂9L饲料的鱼具有最高的增重（WG）和比生长率（SGR），但与饲喂7L或12L饲料的鱼没有显着差异（p> 0.05）。 FI与饮食脂质水平成反比。在饲喂5升日粮的鱼中，观察到最差的FCR和最低的PER，但是对于饲喂日脂水平为9％至16％的鱼，这些参数显示无显着差异（p> 0.05）。氮的摄入量随饮食中的脂质水平降低。饲喂7L饲料的鱼显示最高的N吸收，与饲喂9L和12L饲料的鱼没有显着差异（p> 0.05）。饲喂5L日粮的鱼的氮保留量明显低于其他组。脂质摄入和脂质增加随饮食中脂质水平的增加而增加。 7L饮食的脂质保留率（％）最低，但与其他治疗方法相比无显着差异（p> 0.05）。鱼体附近的组成显着受饮食脂质水平的影响（p <0.05）。体内脂质含量与膳食脂质水平成正比。相反，全身的水分含量与膳食脂质水平呈负相关。膳食脂质含量对全身和白肌蛋白质含量无显着影响（p> 0.05）。随着饮食脂质水平的增加，条件因子（CF），肝体指数（HSI）和内脏体指数（VSI）升高。根据WG对膳食脂质水平的二阶多项式回归分析，表明在浮式网箱中养殖的石斑鱼石斑鱼幼鱼最大生长的最佳饮食脂质浓度为10.0％的断点。

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