短须裂腹鱼胚胎及早期仔鱼发育观察

Observation of Embryonic and Early Larval Development of Schizothorax wangchiachii

2014年12月通过人工繁殖获得短须裂腹鱼受精卵,并在人工孵化条件下对其胚胎和早期仔鱼发育特征进行观察。结果显示,短须裂腹鱼成熟卵为浅黄色,卵径为（3.18±0.17）mm,吸水膨胀后达（3.96±0.25）mm。在水温12.7~14.0℃[平均（13.68±0.32）℃]条件下,受精卵在受精后3.17h胚盘隆起,16h进入囊胚期,47h进人原肠期,60.67h进入神经胚期,74.67h出现肌节,192.5h孵出,胚胎发育有效积温为2633.68h·℃。初孵仔鱼全长为（10.88±0.41）mm,13d仔鱼鳔完全充气,开始平游,18d仔鱼卵黄囊消失。分析发现短须裂腹鱼胚胎发育特点与其他裂腹鱼亚科鱼类存在一定程度的差异。

The embryonic and larval development was observed in fertilized eggs of Schizothorax wangchiachii collected via artificial reproduction in December of 2014. It was found that the mature eggs was light yellow in color, and had diameter of （3.18±0.17） mm and （3.96±0.25） mm via water absorption. The blastodisc stage was observed in 3.17 h, and then the blastula and gastrula stages began in 16 h and 47 h, and the neural plate stage appeared in 60.67 h, and the myomere occurred in 74.67 h at water temperature of 19-21 ℃, with an average of 13.68 ℃. The fertilized eggs were hatched in 192.5 h, with the sum effective accumulative temperature of 2633.68 h · ℃. The newly hatched larvae had total length of （10.88± 0.41） mm, inflated air bladder to swim horizontally and exhausted yolk sac in 13 d and 18 d post hatching, indicating that there was to some extent differences in the characteristics of embryonic development between S. wangchiachii and the other members in Schizothoracinae.