鮸鱼胚胎发育及其仔、稚、幼鱼形态特征和生活习性的初步研究

Study on embryonic development and morphological characteristic habitual behavior for larvae,juvenile and young of Miichthys Miiuy

作者对（鱼免）鱼（Miichthys miiuy）的早期发育（从受精卵到45日龄幼鱼）形态特征及生态习性进行了描述。（鱼免）鱼的受精卵在水温21．4℃～22．O℃，盐度25．7条件下，经过29h30rain仔鱼孵出。从受精卵到仔鱼出膜可分为卵裂期、囊胚期、原肠期、胚体形成期等4个主要时期，然后进入胚后发育阶段。孵出后的3耳龄仔鱼已能在水体中平游，极少数个体可开口撮食轮虫。4日龄仔鱼全部开口摄食，并对光反应敏感，出现明显的集群现象。22日龄的后期仔鱼各鳍鳍条发育形成，鳞片开始出现，进入到稚鱼期。39日龄后，挽鱼全身披满细小的鳞片，全部分布于育苗池的底部，开始进入到幼鱼发育阶段。根据仔、稚、幼鱼形态特征和生活习性对（鱼免）鱼的分类进行了探讨。

The morphological characteristic and habitual behavior of Miichthys miiuy were described in ear- ly development from fertilized egg to 45 d Miichthys miiuy juvenile. Fertilized eggs have hatched after 29 h30 min at water temperature of 21.4-24.0℃ and salinity of 25.7, which passed four stages, cleavage stage, blastula stage, gastrula stage, then toke later-embryonic stage. On the 3rd day, the larva was able to swim in the water, few started feeding with rotifer. On the 4th day, all of larvae started feeding and gradual- ly started responsing to light, living in groups was observed. On the 22rd day, the hypurals were completed, and the scale begun to appear, entering the juvenile stage. Scales were all around juvenile after 39 days, and all juvenile lived at the bottom of pond, entering the young stage. Based on the morphological characteristic and habit of Miichthys rniiuy larva, juvenile and young, the taxonomy of Miichthys miiuy was probed.