摘要
为系统揭示斑石鲷(Oplegnathus punctatus)从初孵仔鱼到幼鱼阶段消化系统各组织器官结构变化的规律,本研究对1～49日龄的斑石鲷仔、稚、幼鱼进行了连续组织学切片实验分析.结果显示,1日龄的斑石鲷初孵仔鱼的消化道位于卵黄囊内侧,且仅为一条简单的管状结构.根据斑石鲷消化系统发育的状况,大致可将其分为三个阶段:1～3日龄,消化系统尚处于未分化的原始阶段,此时的斑石鲷口裂封闭,仅以卵黄囊作为营养来源,呈现完全的内源性营养;4～20日龄,消化系统初步发育,处于拥有基本的摄食、消化与吸收能力的过渡阶段,这一阶段斑石鲷口裂开启,卵黄囊逐步消失,肝胰脏快速发育成型,逐步拥有消化食物的能力,由此开始向外源性营养转变;21～35日龄,消化系统进一步发育,胃腺出现,形成结构完整的消化系统,此后斑石鲷消化系统各组织器官仅有细胞规模上的增长,不再出现结构上的质变.
Abstract
To systematically reveal the change of organs of Oplegnathus punctatus at its early stage of digestive system development,continuous histological sections of O.punctatus aged from 1 to 49 days were analyzed.The results showed that the digestive tract of 1-day-old O.punctatus was located inside the yolk sac and was only a simple tubular structure.The development of the digestive system of O.punctatus can be roughly divided into three stages.At 1～3 days of age,the digestive system was still in the primitive stage.At this age,the mouth fissure was closed,and only the yolk sac was used as the nutrient source,thus presented a complete endogenous nutrition.At 4～20 days of age,the digestive system was preliminarily developed,and it was in the transition stage with basic feeding,digestion and absorption capacity.At this stage,the mouth fissure opened,the yolk sac gradually disappeared,and the hepatopancreas developed rapidly.The fish gradually developed the ability to digest food.The tran-sition to exogenous nutrition began.Tt 21 to 35 days of age,the digestive system developed further and the gastric glands appeared,forming a complete digestive system.After that,the tissues and organs of the digestive system only increased in cell scale rather than structural changes.
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