【摘要】 利用石蜡包埋连续切片技术,通过对1-40日龄鮸鱼仔稚鱼消化系统组织学发育的观察,探讨了鮸鱼仔稚鱼期不同发育阶段的消化器官组织学结构变化及卵黄囊的吸收机制。在水温为17.3-24.9℃的条件下,初孵仔鱼消化管仅为一细长的线状管,位于卵黄囊上方。3日龄仔鱼消化管基本上贯通,变长,肝脏、胰脏出现。4日龄仔鱼卵黄囊完全被吸收,消化管完全贯通,开始摄食。消化管明显分化成食管、胃、肠,此时开始进入外源型营养阶段。9日龄仔鱼,粘膜层出现胃小凹及粘膜褶皱。25日龄仔鱼,胃腺出现,粘膜褶皱增多。28日龄仔鱼,消化系统从结构和功能上趋于完善。本文分析了鮸鱼仔稚鱼消化系统的早期发育特点与摄食、营养方式的关系,并比较了鱼类肝脏、胰脏的组织学发育特点。更多还原

【Abstract】 The development of digestive system was examined in larval and juvenile Miichthys miiuy by means of paraffin section from hatching to 40 days.Changes of the histological structure and the absorbability of yolk-sac were described in every early developmental stage.Hatching temperatures were maintained at 17.3-24.9 ℃.The digestive tract was a threadlike tube lying dorsal to the yolk-sac at the newly hatched larvae.It had been formed on the 3rd day after hatching,then elongated and accessory glands(1iver and pancreas) appeared.Yolk-sac had been completely absorbed and mouth was open on the 4th day after hatching.Esophagus,stomach,intestine,live and pancreas had formed and the digestive system showed differentiates obviously.Feeding changed from internal to external type too and showed that the histological change of digestive system was parallel to food.On the 9th day gastric pits and mucous fold in the gastric wall appeared.On the 25th day gastric glands in the gastric wall appeared with mucosal fold increasing.Up to 28th day,the structure and function of digestive tract and digestive glands completed obviously.The relationship among the early development characteristics of digestive system,feeding and digestive way was discussed in this study.The digestive glands such as live and pancreas of same fishes were compared.更多还原