卵形鲳鲹幼鱼的饥饿和补偿生长研究

Study on the compensatory growth following starvation of juvenile golden pompano Trachinotus ovatus

摘要:

研究了卵形鲳鲹（Trachinotus ovatus）幼鱼在不同饥饿时间（1、2、5、7 d）处理后再恢复投喂的补偿生长。室外水泥池和近海网箱两次实验结果均显示，在前15 d、30 d内，饥饿1 d、2 d组卵形鲳鲹生长略快于对照组，出现完全补偿生长现象。第一次实验饥饿5 d、7 d组的鱼在相同的时间内，体重的增加量未能赶上对照组，为部分补偿生长。饥饿组饲料转化效率高于对照组，且随饥饿时间的延长呈增大趋势；摄食率也随饥饿时间的延长而增大，但饥饿1 d、2 d组摄食率低于对照组，各饥饿组总摄食量均低于对照组，表明卵形鲳鲹幼鱼的补偿生长主要是通过提高饲料转化效率来实现的。对鱼体进行生化组成的结果分析发现：饥饿使鱼体水分和灰分含量升高，脂肪和蛋白质含量下降，且脂肪损失率高于蛋白质损失率，实验结束时，各组鱼体生化组成均恢复到对照组水平，表明在饥饿期间，卵形鲳鲹幼鱼主要消耗的能量物质为脂肪。

Abstract:

A starvation trial was conducted to determine compensatory growth of the juvenile golden pompano Trachinotus ovatus which were deprived of food for 1,2,5 and 7 days respectively. The results of tests in outdoor cement pools and net pens showed that, in the first 15 d, 30 d, the growth of 1 d, 2 'd-deprived groups was probably same with the control group, which accorded with fully compensatory description.However, the weight of 5 d,7 d-deprived fingerlings were lower than that of the control group, which accorded with the description of the patial compensatory growth. As the starvation prolonged, feed conversion efficiency of the starved groups increased and was higher than the control group.Meanwhile, feeding rate also increased, but the fish of 1 d,2 d-deprived groups was lower than that of the control group, and feeding quantity was reduced and lower than the control group. It suggested that the mechanism of compensatory growth was mainly due to improving feed conversion efficiency. Fish biochemical composition was analyzed: the water content and ash of fish sample increased due to starvation, while the lipid and protein decreased. The loss of lipid was higher than that of the protein, and the biochemical composition of fish in each group was restored to the control level by the end of the experiment. It suggested that Trachinotus ovatus may mainly consume lipid during the period of starvation.