饥饿对真鲷生长及生化组成的影响

The effects of starvation on growth and biochemical composition in Pagrosomus major

在 2 0℃条件下 ,对真鲷进行了不同时间的饥饿处理后再投饵的恢复生长实验。饥饿 1 5d的真鲷体重下降7.0 5 % ,鱼体水分含量略有上升 ,蛋白质含量和比能值略有下降 ,脂肪含量和灰分含量没有明显改变。这表明真鲷在饥饿过程中主要消耗蛋白质作为身体的能量来源。分别给饥饿处理 0 (对照 )、3、6、9、1 2和 1 5d的真鲷投饵 ,在饱足摄食的条件下生长 2周。各饥饿处理组的鱼体生化组成及比能值均接近 ,并恢复到对照组水平。饥饿 3、6d处理组在恢复生长中的特殊生长率、摄食率显著高于对照组 ,而食物转化率与对照组无显著差异 ;饥饿9、1 2和 1 5d处理组的特殊生长率和食物转化率均显著高于对照组 ,而摄食率与对照组无显著差异。结果表明真鲷幼鱼具有超补偿生长能力 ,短期饥饿的真鲷在恢复生长中通过显著提高摄食水平来达到补偿生长 ;

The recovery growth experiment in red sea bream,Pagrosomus major, following different starvation time at 20℃.During starvation of 15 days, the fish lost 7.05% body weight comparing with its initial weights; the water content within the fish body increased slightly; the protein and the energy content decreased slightly too; the lipid and ash did not significantly change. The tested fish were divided into 6 experiment groups which were deprived of food for 0(control),3,6,9,12 and 15 days respectively. Then each group was sated with food for two weeks. At the end of the recovery growth,chemical composition and energy content in each group were similar with the control group. The specific growth rate and feeding rate of groups which were deprived of food for 3 and 6 days significantly higher than the control group, but food conversion efficiency was similar with the control group; the specific growth rate and food conversion efficiency of groups which were deprived of food for 9,12 and 15 days significantly higher than the control group, but feeding rate was similar to the control group. This results suggest the compensatory growth in red sea bream which was deprived of food for 6 days resulted in significant increase of the feeding rate in the recovery growth; but the compensatory growth in red sea bream which was deprived of food 9,12 and 15 days resulted in significant increase of the food conversion efficiency in the recovery growth.