洞庭黄鲶胚胎发育观察

[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。

Embryonic Development of Silnrus asotus in Dongting Lake

[Objective] The research aimed to provide technical basis for fry rearing of Silnrus asotus in Dongting Lake.[Method] The induced spawning medicine was used in the experiment to conduct artificial induced spawning and fertilization for obtaining round green fertilized eggs.According 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 37 h 20 min 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.