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研究了在25.5～30.0℃条件下分别饥饿0、5、10、15 d后,再恢复投喂15 d对吉富罗非鱼(GIFT,Oreochromis niloticus)摄食、生长及体成分的影响.结果显示:随着饥饿时间的延长,吉富罗非鱼体重损失率显著增大,水分和灰分的质量分数逐渐升高;粗脂肪的质量分数在饥饿前期下降较快,随着饥饿时间的延长下降速率逐渐减慢,3个饥饿组与对照组有显著差异(P<0.05);粗蛋白的质量分数在饥饿前期下降不明显,饥饿5 d组与对照组差异不显著(P>0.05),而饥饿后期下降较明显,饥饿10、15 d组与对照组差异显著(P<0.05);鱼体能量不断下降,除饥饿5 d组外,各饥饿组与对照组均存在显著差异(P<0.05).恢复投喂后,各饥饿组体成分和鱼体能量均恢复至对照组水平,各饥饿处理组恢复投喂期间的摄食率显著高于对照组(P<0.05).结果表明:饥饿5 d组吉富罗非鱼具有完全补偿生长能力,饥饿10、15 d幼鱼仅有部分补偿生长能力,这种补偿生长效应可能主要是通过饥饿后食欲增强,摄食量增加实现的.
The effects of starvation on the feeding, growth and body composition of GIFT (Oreochromis niloticus) after 0, 5, 10 and 15 days of starvation at 25.5-30.0 ℃ were studied. The results showed that: With the prolongation of starvation time, the body weight loss rate of F. tibetanus increased significantly and the mass fraction of moisture and ash gradually increased. The fraction of crude fat decreased rapidly in the early stage of starvation, and the rate of decline decreased with the increase of starvation time (P <0.05). The crude protein content did not decrease obviously in the early stage of starvation, but there was no significant difference between the 5-day starvation group and the control group (P> 0.05) Obviously, there was a significant difference between starvation group and control group (P <0.05), and the energy of fish body decreased continuously, except starvation group (5d), there was significant difference between starvation group and control group (P <0.05) After feeding, body composition and body energy of all starving groups returned to the level of the control group, and the feeding rates of all starvation groups were significantly higher than those of the control group (P <0.05). The results showed that: Tilapia has the ability to fully compensate for growth, and partial starvation of juveniles at 10 and 15 d Ability to grow, this effect may be compensatory growth mainly through starvation increased appetite, increased food intake to achieve.