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首页> 外文期刊>Fisheries and Aquatic Sciences >Ontogenetic Development of the Digestive System in Chub Mackerel Scomber japonicus Larvae and Juveniles
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Ontogenetic Development of the Digestive System in Chub Mackerel Scomber japonicus Larvae and Juveniles

机译：Chu鲭鱼幼虫和幼虫消化系统的发育发育。

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Chub mackerel, Scomber japonicus, larvae and juveniles were reared from hatching to 35 days after hatching (DAH), and the development of their digestive systems was histologically investigated. The larvae were initially fed on rotifers and Artemia nauplii starting around 19 DAH, and thereafter on Artemia nauplii, fish eggs, and a formulated feed mixture. The primitive digestive system differentiated at 3 DAH; the digestive tract was distinctively divided into the buccopharyngeal cavity, esophagus, stomach, air bladder, intestines, and rectum. The gastric gland and pyloric caeca first appeared at 5 and 7 DAH, respectively. The stomach was divided into cardiac, fundic, and pyloric regions in the preflexion phase. The number of gastric glands and pyloric caeca, as well as the volume of the gastric blind sac increased markedly, with development continuing into the juvenile stage. The precocious development of the digestive system during the larval period might be related to the early appearance of piscivory, which is able to support high growth potential. The organogenesis results obtained for this precocial species represent a useful tool to aid our understanding of the physiological requirements of larvae and juveniles to ensure optimal welfare and growth under aquaculture conditions, which will improve current rearing practices of this scombrid species.
机译：从孵化到孵化后35天（DAH），将鱼，鲭鱼，幼虫和幼鱼饲养，并对其组织的消化系统进行了组织学研究。幼虫最初从大约19 DAH开始以轮虫和无节幼体为食，然后以无节幼体，鱼卵和配制的饲料混合物为食。原始消化系统在3 DAH时分化;消化道明显分为颊咽腔，食道，胃，气囊，肠和直肠。胃腺和幽门盲肠最早出现在5和7 DAH。在屈曲前，胃被分为心脏，胃底和幽门区域。胃腺和幽门盲肠的数量以及胃盲囊的体积显着增加，并且发育一直持续到幼年期。幼体时期消化系统的早熟发育可能与食肉动物的早期出现有关，食肉动物能够支持高生长潜力。该早熟物种获得的器官发生结果代表了一种有用的工具，有助于我们了解幼虫和幼体的生理需求，以确保在水产养殖条件下获得最佳的福利和生长，这将改善该混养物种目前的饲养方式。

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