饥饿和再投喂对鲈幼鱼生长和生化组成的影响

Effects of starvation and refeeding on growth and biochemical compositions of common sea-perch Lateolabrax japonicus

研究了鲈Lateolabrax japonicus幼鱼（40．71g±2．92g）经不同饥饿时间处理，再恢复喂食后的生长情况，试验共进行40d，水温为26～28℃。结果表明：饥饿5d组（S5）鲈体重略高于对照组，饥饿10d组（S10）鲈略低于对照组，但差异均不显著（P〉0．05），饥饿15d组（S15）鲈体重极显著低于对照组（P〈0．01）；饥饿15d后鱼体蛋白质含量明显下降，脂肪含量及鱼体比能值略有下降，灰分及水分含量明显上升；恢复投喂后，各饥饿处理组鱼体化学组成及比能值均接近，并恢复到对照组水平；随着饥饿时间的延长，标准代谢率下降，恢复投喂后又回升至对照组水平；从组织结构看，胃、肠和肝脏随着饥饿时间的延长出现不同程度的损伤，恢复投喂后各组织结构均有恢复。由此表明：S5组和S10组的鲈在恢复生长过程中产生了完全补偿生长效应，S15组出现了部分补偿生长效应。

The growth was examined in common sea- perch Lateolabraxjaponicus weighing （40. 71 ± 2.92）g starved for various periods and refed for 40 days at 26 - 28 ℃. The results showed that the fish refed after 5 day starvation （S5） had better growth than the fish in the control group. The fish refed after 10 day starvation （Sz0）, however, had slower growth than the fish in the control group without significant difference. There were reduction in protein, fat and energy levels and increase in ash and moisture levels in the fish starved for 15 days （S15）. The fish refed after different periods of starvation had the similar approximate composition and energy, returning to the level in the control group. The standard metabolic rate of the starved fish decreased as the starvation proceeded, and then returned to the level in the control group after refeeding. Also, different damages were found in the stomach, intestine and liver of the fish starved for different periods, being recovered after refeeding, indicating that complete compensatory growth occurred in group S5 and group S10 in the course of recover）- growth, but the partial compensatory growth in group S15, It is suggested that the compensator）, growth in common sea -perch be attributed to increase in food intake （FR） and food conversion efficiency （FCE）.