不同初次投饵时间对云斑尖塘鳢仔鱼生长和成活的影响

Effects of initial bait casting time on growth and survival of Oxyeleotris marmorata larva

利用人工孵化的云斑尖塘鳢初孵仔鱼,在水温30（±1）℃条件下对其进行不同初次投饵试验,研究其仔鱼生长和成活情况.结果表明,云斑尖塘鳢部分仔鱼在破膜后第2d开口摄食,3日龄开始投饵组的仔鱼相对于其他试验组生长较好.仔鱼初次摄食率为5.56％,5日龄仔鱼初次摄食率最高,混合营养期为3d.仔鱼的不可逆点（PNR）出现在孵出后的第5.5～6 d之间,各组在第7、8d仔鱼日死亡率最高.云斑尖塘鳢仔鱼最佳初次投饵时间为3日龄.

The effects of different initial bait casting time on growth and survival of artificial incubation Oxyeleotris marmorata larva was examined at 30 （±）℃. The results indicated that, a small number of larvae began to open and feed after rupture in 2 days, the larva, within 3 days of age began to cast the bait, grew better than those in other groups. The initial feeding rate was 5.56%, the initial feeding rate of larva with 5 days of age was at the highest level, and the mixed nutrition period was for 3 days. The point of no return （PNR） of larva was shown on the time of 5.5-6 days after hatch and the daily mortality was the highest between 7 days and 8 days within all groups. The investigation demonstrated that the optimal initial bait casting time for 0. marmorata larva was at 3 days of age.