关键词: 大口黑鲈, 消化道, 组织结构, 黏液细胞, 类型, 分布

Abstract: Abstract[摘要请按中文修改]:【Objective】 The results can provide useful direction for further histology research of the digestive system and further analysis of digestion physiology in largemouth bass (Micropterus samoides). 【Method】The method of routine paraffin tissue section, hematoxylin-eosin (H.E) and Alcian blue-periodie acid Schiff (AB-PAS) staining were useed in this study. The histological structure of digestive tract of largemouth bass and types and distribution of mucous cells were studied 【Results】The results showed that the digestive tract were composed of oral-pharyngeal cavity, esophagus, stomach, pyloric caeca and intestine. From the front to the rear section, the diameter and number of duplicatures in pyloric caeca and intestine decrease significantly (P<0.05) by counting the diameter, number and heights of duplicatures and muscular thickness. Mucous cells were mainly distributed in the epithelial tissue and the typeⅠ,Ⅱ, Ⅲ and Ⅳ mucous cells were observed in the whole digestive tract. Type Ⅲ mucous cells were in the majority of the esophagus and intestine; type Ⅳ mucous cells were most in the oral-pharyngeal cavity, midgut and hindgut; stomach only had typeⅠ mucous cells specially.【Conclusion】The characteristics of mucous epithelium and mucous cells showed differences in different positions.Mucous cells were distributed in each section of digestive tract and there were differences in the types and numbers of mucous cells in different parts .

Key words: Micropterus samoides, Digestive tract, Histological structure, Mucous cells, Types, Distribution