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鳔管
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     What should be managed?
     什么?
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     Modular Tube
     组像
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     elongatus, D.
     短盘鮈D.
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     STUDIES ON THE BLOOD VESSELS OF EYE, GAS BLADDER AND KIDNEY OF SNAKEHEAD
     乌鳢的眼、和肾脏血管的研究
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     Altogether four new species are reported, they are Discogobio polylepis, D.
     长盘鮈D. macrophysallidos,sp.
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  air duct
Noise silencer in the form of a Helmholtz resonator at the outlet of an air duct of finite length
      
A new type of noise silencer with the original design of the air duct-resonator system is proposed.
      
The design is free of the disadvantages that are inherent in the conventional design with a resonator placed inside the air duct.
      
A physical model of the silencer is developed, and its efficiency is calculated for different geometrical and physical parameters of the resonator and the air duct.
      
The air was ionized by an ion generator, which was placed at the outlet of the air duct.
      
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  pneumatic duct
The swim bladder of the cyprinid Carassius auratus (goldfish) is a two-chambered organ connected to the esophagus by a pneumatic duct.
      
5-Hydroxytryptamine immunoreactivity was found in endocrine cells in the pneumatic duct of the eel and in the swimbladder walls of the goldsinny wrasse and the rainbow trout.
      
In the eel, the effects on the pneumatic duct were generally greater than on the swimbladder proper.
      
The dipnoan Protopterus has innervated pulmonary neuro-endocrine cells in the pneumatic duct region with dense-cored vesicles.
      
Fluorescently labelled phalloidin revealed myocytes that appeared to form a possible sphincter at the junction of the pneumatic duct and esophagus.
      
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The present paper deals with the comparative anatomy of the digestive system and the gas-bladders of clupeoid fishes. Nine species belonging to nine genera and five subfamilies have been investigated in this study.The clupeoid fishes mainly feed on plankton, diatoms and debris. Their mouth is small, with small or degenerated teeth. A principal adaptation of the strainers is the development of the gill rakers. In Harengula nympha, Sardinella aurita, Macrum reevesii and Clupanodon punctatus have suprapharyngeal...

The present paper deals with the comparative anatomy of the digestive system and the gas-bladders of clupeoid fishes. Nine species belonging to nine genera and five subfamilies have been investigated in this study.The clupeoid fishes mainly feed on plankton, diatoms and debris. Their mouth is small, with small or degenerated teeth. A principal adaptation of the strainers is the development of the gill rakers. In Harengula nympha, Sardinella aurita, Macrum reevesii and Clupanodon punctatus have suprapharyngeal organs. The stomachs show a rather Y- and or U-shaped pattern. Clupanodon punctatus and Macrura reeveii have a U-shaped pattern and the wall of the pylorus is more or less thickened and mascularized; the stomach of the former species a appears as a bird's gizzard; the latter species has a Y-shaped pattern. Those fishes which feed principally on phytoplanktons have an elongated intestine arranged in folds. All clupeoid fishes have a pyloric caeca. The gas-bladders extend anterioly to the region of inner ears and some of them have posterior openings. The gas-bladders show three patterns and two subpatterns.

本文对鲱科5亚科、9属9种鱼类的消化系统和鳔作了比较研究。鲱科鱼类主食浮游生物、硅藻和有机碎屑。口小。齿小或退化。鳃耙发达,细长数多,具滤食作用。有些种类具咽上器官。胃呈Y型和U型。斑(鱼祭)的幽门胃壁肌肉屡增厚,它们主食浮游植物,肠长而盘曲多。所有鲱科鱼类均具幽门盲囊,鳔分支向前经耳囟延伸至内耳区,有些有后鳔管孔通外界。鳔有3式型和2亚型。

Although so far as the form is concerned, N.

从卵细胞粘丝,鳔管长与鳔长比值、鳃膜条宽度与全长比值、产卵群体等4个方面对近太湖新银鱼和太湖新银鱼进行的初步比较,证明近太湖新银鱼与太湖新银鱼均为2个有效种。

 
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