Structure and ultrastructure studies of the digestive tract of the endangered Qinling lenok (Brachymystax tsinlingensis Li, ۱۹۶۶)
Publish place: Iranian Journal of Fisheries Sciences، Vol: 18، Issue: 4
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JIFRO-18-4_030
تاریخ نمایه سازی: 27 بهمن 1400
Abstract:
The aim of this study was to investigate the structure and ultrastructure of the digestive tract of Qinling lenok (Brachymystax tsinlingensis Li, ۱۹۶۶), a cold water Salmonidae fish, an endangered teleost species, with high potential for controlled rearing in Shaanxi Province of China, by light and electron microscopy. Morphological data of the digestive tract are important for understanding fish nutrition, pathological or physiological alterations. The histological structure of Qinling lenok consists of four layers: mucosa, submucosa, muscularis and serosa. Taste buds were found in lips and esophagus. The esophageal mucosa consists of undifferentiated mucous cells and surface epithelial cells. The U-shaped stomach was divided into cardiac, fundic and pyloric region. There are numerous gastric glands in the submucosa layer of the cardiac and fundic stomach, but none of them are present in the pyloric region. The convoluted tube-shape intestine is lined by simple columnar epithelial cells with microvilli at the apical surface, with an intestinal coefficient of ۰.۶۱. There are numerous goblet cells in the intestine. Finger-like pyloric caeca were found in the front of intestine tube, with number ranged from ۴۲ to ۸۸. In ultrastructural level, mucous and glandular cells in the stomach were found, the glandular cell with well-developed tubulovesicular system, a great amount of pepsinogen granules, mitochondria and Golgi apparatus. The enterocytes with abundant microvilli contained mitochondria and lysosome, and mucous granules of goblet cells were apparent in the intestine. High density of lipid droplets of pyloric caeca might be concerned with fat-absorption. The present study suggests that the digestive tract of Qinling lenok is similar to other carnivorous fishes, in relation to its feeding habits.
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Authors
D.M Xiong
College of Animal Science and Technology, Northwest A;F University, Yangling, Shaanxi ۷۱۲۱۰۰, China
Y.X Meng
College of Animal Science and Technology, Northwest A;F University, Yangling, Shaanxi ۷۱۲۱۰۰, China
H.R Yu
Bioengineering College, Weifang University, Weifang, Shandong ۲۶۱۰۶۱, China
X.L Liu
College of Animal Science and Technology, Northwest A;F University, Yangling, Shaanxi ۷۱۲۱۰۰, China
H.X Liu
College of Animal Science and Technology, Northwest A;F University, Yangling, Shaanxi ۷۱۲۱۰۰, China
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