凹目白鲑胚胎发育的研究

Study on the Embryonic Development of Coregonus autumnalis

为了掌握凹目白鲑胚胎发育的规律,提高凹目白鲑的孵化率,本文采用显微镜观察法对凹目白鲑的受精卵形态、胚胎发育过程和破膜仔鱼形态,进行了研究。试验结果表明：淤受精卵呈圆球形、橙黄色,具有黏性,含有许多大小不一的油球,卵径范围在2.0-2.5 mm,卵裂方式为盘状卵裂。于凹目白鲑胚胎发育所需孵化积温为529.85益·d,受精卵历时97 d孵化出膜。凹目白鲑胚胎发育持续时间较长,发育过程分为受精卵、卵裂、囊胚、原肠、神经胚、器官发生、破膜7个发育阶段。榆仔鱼具有好动、动作灵敏、游动迅速等特点。

The fertilized egg,embryo development and larvae of Coregonus autumnalis were observed by using the microscope method ,in order to master the regular pattern of Coregonus autumnalis＇s embryonic development and improve the hatchability of Coregonus autumnalis.The results showed that： （1） the fertilized egges were of round ball ,orange with sticky.There were many different sizes of the oil droplet in the fertilized egges.The diameter of fertilized egg was from 2.0 mm to 2.5 mm.The cleavaging way was plate cleavage. （2）The accumulative temperatures of Coregonus autumnalis＇ embryonic development were 529.85 ℃ ·d.The fries were hatched by needing 97 d after fertilizing. （3） Coregonus autumnalis＇ embryonic development process was divided into a fertilized egg, cleavage, blastula, primitive gut, neural embryo, organogenesis, membrane perforation seven stages.The process was longer.（4） The characteristic of Coregonus autumnalis＇ fries was with active, action quick, swimming quickly etc.