【摘要】 裸胸鳝(Gymnothorax)是珊瑚礁生态系统的重要鱼类。本研究采用光学显微镜与扫描电镜技术对匀斑裸胸鳝(G.reevesii)消化道组织结构进行了系统的研究。结果表明,匀斑裸胸鳝口咽腔黏膜上皮为复层鳞状上皮,内含杯状细胞和味蕾,表层细胞表面具有微脊;食道上皮形成黏膜皱褶,黏膜上皮部分区域衬着有单层柱状上皮,且含有丰富的杯状黏液细胞;胃呈"┫"形,可分为贲门部、盲囊部和幽门部,贲门部与盲囊部含有丰富的胃腺,扫描电镜结果显示胃表面具有丰富的胃小凹;肠道较短,肠道系数为0.33,黏液细胞数量从前肠往后肠逐渐增多,肠道微绒毛和纤毛的数量从前肠往后肠逐渐减少。匀斑裸胸鳝的齿、食道、肠道系数、胃肠结构等特征均表明匀斑裸胸鳝是一种典型的肉食性鱼类。更多还原

【Abstract】 As an important coral reef fish, Gymnothorax reevesii has significant ecological and economic value. Research on its digestive physiology provides insights into its ecological conservation and artificial breeding. The histological structure of the digestive tract of G. reevesii was studied using light and scanning electron microscopy. The mucosa of the oropharyngeal cavity was composed of stratified squamous epithelium with some goblet cells and taste buds, and many micro-ridges on the surface of the epithelial cells. The mucosa of the esophagus formed abundant folds. Some localized areas of epithelium were composed of simple columnar cells, and there were many large goblet cells. The‘┫’-shaped stomach may be divided into three regions, cardiac, caecum and pyloric. The cardiac and caecum regions contained more gastric glands, while gastric glands were not found in the pyloric and terminal caecum regions. Scanning electron microscopy revealed numerous gastric pits in the gastric internal surface. The intestine of G. reevesii was short(Intestinal Coefficient 0.33), and the number of mucous cells gradually increased from the anterior to the posterior intestine. On the other hand, the number of microvilli and cilia was significantly reduced from the foregut to the hindgut. The sharp teeth, abundant goblet cells in the esophagus, lower intestinal coefficient, and significant stomach-intestine structural differentiation indicated that G. reevesii is a typical carnivorous fish.更多还原