南方大口鲇消化管胚后发育组织学研究

Post-embryogenic developmental histology of digestive tract of Silurus soldatovi meridionilis Chen

南方大口鲇在水温（１５．５±０．５）℃条件下孵化后７～１０日龄为混合营养期；３～６日龄，肠上皮细胞分化为吸收细胞、吸收分泌细胞及分泌细胞３种类型。消化管发育初期参与卵黄吸收。前期仔鱼及仔鱼阶段消化管壁结构不完善。

The nutrition-mixed period of larval Silurus soldatovi meridionils Chen is from day 7～10 after the larvae are hatched when the water temperature is (15.5±0.5) ℃.From 3rd day on,the epithelial cells of intestine begin to differentiate into 3 types of cells till day 6,which are absorbing cells,absorbing-secreting cells and exocrine cells.The digestive tract participates in the absorption of yolk at its early developmental stage.The structure of the tract wall develops incompletely at prelarval and larval stages when its ability is poor in mechanical digestion.