Author(s): ZHANG Jian-ye, YANG Rui-bin, YANG Xue-fen, WANG Wei-min, WEI Kai-jian, FAN Qi-xue, Key Laboratory of Freshwater Animal Breeding Certificated by Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province
Pages: 93-98
Year: 2014 Issue:  4
Journal: Journal of Huazhong Agricultural University
Keyword:  loach; larval and juvenile; mucous cells; digestive tract; development;
Abstract: Development of mucous cells in different parts of the digestive tract of larval and juvenile(1-45dph)loach was observed and analyzed by histological sections and AB-PAS histochemical staining techniques.The results showed that:there were four types of mucous cells(typeⅠ,Ⅱ,ⅢandⅣ)during the development of digestive tract of loach.Mucous cells in digestive tract were first detected in buccopharygeal cavity and esophagus on 3dph and appeared in every part of the digestive tract on 7dph.Mucous cells were few before 10dph and were widespread in digestive tract after 15dph.As larvae grew, mucous cells changed from infantile types(typeⅠand typeⅡ)to mature types(typeⅢand typeⅣ).According to the development and distribution of mucous cells in the digestive tract of fish,3 to 10dph were critical periods of development of digestive tract in loach.Functions of digestive tract developed well on about 20dph.In order to improve the survival rate of loach larvae and juvenile,appropriate managing measures based on the developmental process of the digestive tract was necessary.