| 摘要: |
| 应用石蜡切片技术和显微测量法,对从孵化后到变态完成(55～60 d, day post hatching, dph) 的条斑星鲽(Verasper moseri Jordan et Gilbert) 仔稚幼鱼早期发育中消化道的结构变化进行了观察,描述了个体发育过程中的组织学结构特征。结果表明,在13～15 ℃,7dph 的仔鱼开口时,消化道已经分化为口咽腔、食道、肠和直肠,消化器官肝脏和胰腺出现。从7 dph 到14～17 dph (卵黄囊消失) 为混合营养期,形态上肠道进一步弯曲、盘旋;功能上中肠空泡样结构和后肠嗜伊红颗粒的出现,预示着肠上皮细胞在胃功能成熟前有吸收蛋白的作用。形态学上胃以及幽门盲囊的分化出现在26～29 dph ,与稚鱼刚开始附底的时期相吻合。而功能性胃的分化则出现在35 dph 左右,与稚鱼变态期相一致。条斑星鲽作为中国新近养殖品种,关于其早期发育的报道还是空白,作者对其消化系统进行系统的研究,旨在为该鱼种的商业化养殖提供相关的科学数据,同时也为海水鱼类早期营养和发育生物学的深入研究提供理论依据。 |
| 关键词: 条斑星鲽(Verasper moseri) 消化道 幽门盲囊 |
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| 基金项目:国家863 计划项目(2006AA10404) ;青岛市科技计划项目(06-2-3-18-hy) |
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| Ontogeny of digestive system during early development stage of barfin flounder |
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| Abstract: |
| A histological examination was made on the ontogenetic development of digestive tract from hatching to day 60 in barfin flounder. After hatching, the digestive tract is a simple undifferentiated tube, closed in mouth and anus. On the day 7, the digestive tract differentiated into four parts: buccopharyngeal cavity, oesophagus, intestine and rectum. The liver and pancreas also became apparent at this age. Between day 7 and day 14 or 17, according to the mixing nutrition period, the vacuoles in the midgut and eosinophilic granules in the hindgut indicated the larval intestinal absorption of protein before the formation of a functional stomach. The stomach and pyloric caeca morphologically differentiated at 26 dp h to 29 dp h and functionally at 35 dp h circa. As a new species for aquaculture, however, no studies on its early development have been carried out. Therefore, in order to enhance the larval rearing success of barfin flounder in culture, there is a need to describe and under stand the ontogeny of it s digestive system. The data acquired also provide a theoretical basis of the further research on the marine fish larval development biology and nutrition. |
| Key words: barfin flounder (Verasper moseri) digestive tract pyloric caeca |
