洞庭黄鲶胚胎发育观察

Embryonic Development of Silnrus asotus in Dongting Lake

[目的]为洞庭黄鲶（Silnrus asotus）的苗种培育提供技术依据。[方法]以催产药物对其进行人工催产、受精，获得圆球形、绿色的受精卵。根据发育过程取材，在显微镜下进行连续观察，并对发育各时期形态特征进行详细记录。[结果]洞庭黄鲶的胚胎发育过程可分为胚盘期、卵裂期、囊胚期、原肠期、神经胚期、器官形成期和出膜期7个阶段。在22.0-24.0℃水温条件下，经过37 h20 min孵化出苗。[结论]洞庭黄鲶与大多数鲶类胚胎发育时序基本相同，在20.0-25.0℃水温范围内孵化时间短于鲶形目其他鱼类。

[ Objective ] The research aimed to provide technical basis for the fry rearing of Silnrus asotus in Dongting Lake. [ Method j The induced spawning medicine was used in the experiment to conduct artificial induced spawning and fertilization for obtaining round green fertilized eggs. Ac- cording to embryonic development,the morphological characteristics of embryo at different developmental stages were recorded detailedly through microscope. [ Result ] The embryonic development of Silnrus asotus in Dongting Lake was divided into 7 stages, namely, blastoderm stage, cleavage stage, blastula stage, gastrula stage, neurula stage ,organogenesis stage and pre-hatching stage. After hatched for 37h 20rain in water at 22 -24 ℃ fries were come out. [ Conclusion]The time sequence of Silnrus asotus in Dongting Lake was basically similar to that of other catfish,while its hatching time was shorter than that of other fish in Siluriformes.