论文部分内容阅读
以人工繁育的俄罗斯鲟仔鱼为对象,采用实验生态学方法,研究了初次摄食时间对生长及存活的影响。结果表明:在水温17.4℃下,仔鱼在9～10日龄初次摄食,初次摄食前投喂对俄罗斯鲟仔鱼的生长和存活无显著性影响,延迟2d以上初次摄食对生长影响明显,存活率在18日龄初次摄食时显著下降,24日龄时饥饿仔鱼全部死亡;23～24日龄时仔鱼如不能建立外源营养即达到饥饿不可逆点(PNR)。人工养殖条件下,俄罗斯鲟仔鱼必须在初次摄食后14d内建立起主动摄食能力才能保证其仔鱼的正常发育、生长和存活。
Artificial breeding of Russian sturgeon larvae was used to study the effects of initial feeding time on growth and survival using experimental ecology. The results showed that when the water temperature was 17.4 ℃, the larvae fed on the first 9 to 10 days of age had no significant effect on the growth and survival of the Russian sturgeon. The larvae delayed feeding more than 2 days had obvious effects on the growth, At 18 days of age, the initial feeding decreased significantly, while starved larvae all died at 24 days of age. The larvae reached the irreversible hunger point (PNR) at 23-24 days of age if they could not establish exogenous nutrients. Artificial breeding conditions, the Russian sturgeon larvae must be established within 14 days after the initial feeding ability to take the initiative to feed their larvae to ensure the normal development, growth and survival.