胡子鲇胚胎发育的观察

Observation on the embryonic development of Clarias fuscus

利用性成熟的胡子鲇通过人工授精方法获得受精卵,采用光学显微镜观察受精卵胚胎发育的整个过程.其发育过程分为:受精卵、卵裂期、囊胚期、原肠期、神经胚期、尾芽期和孵化期.整个过程在水温27 6～30 5℃条件下,持续23h12min.未受精的卵吸水膨胀不明显,并不产生"附着盘".卵黄运动在卵裂期过程中逐渐加强.出膜过程的启动与头尾的摆动作用无关.

Fertilized eggs of Clarias fuscus were obtained by induced sprawning. The development of the eggs were observed and studied under the light microscope. The fertilized eggs of Clarias fuscus were transparent and adhesive, orange or green in color, and spheroid in shape. The average diameter of the eggs was 1.8 mm, containing a large quantity of yolk. At the water temperature of 27.6-30.5 ℃,the fertilized eggs hatched out after 23 h and 12 min. Yolk movement is important to the embryonic development. The initiation of hatching was found to be not a physical but a bio-chemical effect.