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采用光镜和扫描电镜观察长江刀鲚(Coilia nasus)幼鱼消化系统组织形态学结构。结果显示,刀鲚体长,口裂大,含有犬齿状的颌齿和尖锥状的腭齿,具有5对鳃弓,鳃耙长度明显大于鳃丝且表面附着不规则绒毛状细齿;胃呈“Y”型,胃与肠连接处具有16～21个指状环形幽门盲囊;肠为直肠,较短,比肠长为0.241±0.080;肝分为两叶,胰为独立的器官。刀鲚口咽腔为复层鳞状上皮,含有腺体、大量椭圆形黏液细胞、少量杯状细胞及味蕾;胃黏膜都为典型的单层柱状上皮,含有较多由上皮凹陷形成的胃小凹和胃腺;幽门盲囊具有20～25个丰富的褶皱,占满大部分幽门盲囊腔,黏膜层具有微绒毛;中肠黏膜上皮最发达,形成的褶皱细长且连接成网状,单层柱状上皮与复层扁平上皮交替分布。观察结果表明,刀鲚消化系统具有典型肉食性鱼类特征。
Light microscopy and scanning electron microscopy were used to observe the digestive system histomorphology of juvenile Coilia nasus. The results showed that there were 5 pairs of branchial gill bosses with glenoid body and spiky palate teeth. The length of gill raker was significantly longer than that of gill filaments and the surface had irregular villous serrated teeth. The stomach Was “Y” type, the junction of the stomach and intestine with 16 to 21 finger ring pyloric pyloric; intestinal rectum, shorter, longer than the intestinal 0.241 ± 0.080; liver is divided into two leaves, the pancreas is independent organ. Knife mouth mouth and pharynx for the stratified squamous epithelium, containing glands, a large number of oval mucus cells, a small amount of goblet cells and taste buds; gastric mucosa are typical single columnar epithelium, with more by the formation of small epithelial depression stomach Concave and stomach gland; pyloric blind capsule with 20 to 25 plentiful folds, covering most of the pyloric blind cysts, mucosal layer with microvilli; mucosal epithelium in the most developed, the formation of folds slender and connected into a mesh, single Layer columnar epithelium and stratified squamous epithelium alternately. The observation results show that Doraemon digestive system has typical carnivorous fish characteristics.