黑龙江流域江鳕的胚胎发育

采用固定后剥离卵膜后拍照的方法,在平均水温1.61℃下系统观察了黑龙江流域江鳕（Lota Iota Linnaeus）的胚胎发育。根据发育特征,将江鳕整个胚胎发育过程分六个大的发育阶段。黑龙江流域江鳕受精卵为淡黄色,近似圆球形,具有微粘性,比重略大于水,内部紧靠卵膜分布大量的脂肪滴,吸水膨胀后卵径为1.01±0.11mm,在平均水温为1.61℃水温条件下受精卵至破膜共历时1746h,需4106.98℃.h,进一步细分为21个发育时期。将黑龙江流域江鳕和新疆额尔齐斯河流域江鳕的胚胎发育过程进行了对比分析,为黑龙江流域江鳕的人工养殖和自然资源的复壮提供了基础资料。

Embryonic Development of Burbot（Lota lota）in Heilongjiang River

The embryonic development of burbot（Lota lota）in the Heilongjiang River was observed systematically in the eggs whose membranes were stripped out after they were fixed under a microscope.The whole development process was divided into 6 stages including 21 developmental phases.The burbot zygotes was light yellow in color,nearly spheroidal in shape,and slightly adhesive with a specific gravity slightly higher than water.A large amount of oil globules was found to be next to the membrane and the swelled eggs had a diameter of 1.01±0.11 mm.The larvae were hatched 1746 hours after fertilization at an average water temperature of 1.61℃,with a cumulative temperature of 4106.98℃.h.The embryonic development in the burbot in the Heilongjiang River was compared with the burbot in the Ertish River in Xinjiang Uygur Autonomous Region.The findings provide base data for the artificial culture and the resources rejuvenation of burbot in the Heilongjiang River.