瓯江产唇的早期形态发育研究

The Early Morphological Development of Hemibarbus labeo in Oujiang River

试验结果表明,受精卵授精后120 h,仔鱼开始出膜,初孵仔鱼(体长5.6~6.8 mm,平均体长6.35 mm)鱼体透明,体表和卵黄囊均无黑色素分布,尾鳍透明光滑,具口凹和眼色素并形成胸鳍原基,至卵黄被完全吸收时胸鳍鳍条开始形成,至28日龄时仔鱼各鳍发育完全,肌节数38~42。根据卵黄囊存在的情况和脊索的弯曲程度将仔鱼划分为卵黄囊仔鱼、前弯曲期仔鱼、弯曲期仔鱼、后弯曲期仔鱼。仔鱼眼径与头长比呈递减趋势,进入后弯曲期,体长迅速增加(≥11.8 mm)。唇鱼骨仔鱼体背与体侧黑色素由背鳍下方向尾部扩散,继而由中部至头部扩散。胸鳍附近最早出现鳞片,然后向后侧覆盖,最后在腹部出现鳞片。

The morphological development of larval and juvenile Hemibarbus labeo was described in a hatchery-reared series in the Oujiang River.In the 120th hour after fertilization,it hatched and the newly hatched larva had average standard body length of 6.35 mm(5.6~6.8 mm BL).It was characterized by a transparent,smooth caudal fin and no melanophores on body.The pectoral fin bud appeared at hatching and its rays appeared when yolk absorbed.All of the fins completed on 28th day after fertilization,with 38~42 myomere...