| 摘要: |
| 对人工养殖的条石鲷(Oplegnathus fasciatus)仔、幼稚鱼消化道及消化腺的发育过程进行了系统的组织学观察。研究表明: 初孵仔鱼 (体长1.66～2.20 mm)的消化道完全处于未分化状态。1 日龄仔鱼全长1.83～2.32 mm, 消化道中部开始形成空腔, 为初始的消化道腔。2 日龄仔鱼全长2.61～2.98 mm, 小肠与食道打通。3 日龄仔鱼全长2.56～2.89 mm, 上下颌开启, 口和肛门与外界开通, 部分仔鱼开口摄食。此时消化道已经分化为口咽腔、食道、胃前体、肠和直肠, 消化器官肝脏和胰腺及鳔原基出现。4 日龄仔鱼全长2.73～3.05 mm, 卵黄囊吸收殆尽, 油球残存, 鳔原基进一步增生, 后肠已经出现嗜伊红囊。22日龄, 胃腺开始分化, 至45 日龄, 大部分胃腺结构上分化成熟。本研究结果将为优化条石鲷产业化养殖的科学管理技术和其营养学的深入研究提供理论依据和技术资料。 |
| 关键词: 条石鲷(Oplegnathus fasciatus) 消化道 胃腺 嗜伊红囊 |
| DOI： |
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| 基金项目:国家农业科技成果转化资金项目(05EFN2166000453); 中国科学院创新前沿项目(KSCX2-YW-N-47-08); 青岛市科技发展计划项目(05-1-HY-79) |
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| Histological study of the ontogeny of the digestive tract in Oplegnathus fasciatus |
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| Abstract: |
| Under artificial culture conditions, the developments of the digestive system and its associated glands were examined histologically in Oplegnathus fasciatus from the first day until the 45th day post hatching (dph)．The digestive tube of the first hatching larva was undifferentiated and straight. On the 1st dph, the rudimentary digestive lumen formed as the larve developed. On the second dph (TL, 2.61～2.98 mm), the intestine began to connected with the oesophagus. On the third dph (TL, 2.56～2.89 mm), the upper and lower jaw moved with the mouth and anus opening, indicated the first external feeding. At this time, the digestive tract, consisting of buccopharynx, oesophagus, stomach anlage, intestine and rectum, and the digestive glands, including liver and pancreas, being accompanied by the gas bladder anlage, formed. On the 4th dph (TL, 2.73～3.05 mm), the yolk sac was almost completely absorbed, with residual oil globule, and the acidophilic supranuclear vesicles were seen in the rectum. On the 22 dph, the the gastric gland began to differentiate and was not functional until the 45th dph. |
| Key words: Oplegnathus fasciatus digestive tract gastric gland acidophilic supranuclear vesicles |
