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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2014 Vol.33 No.6

Preliminary Observation on Morphology and Histology of Digestive System in Hemibarbus maculates Bleeker
Author of the article:TUO Yun
Author's Workplace:(College of Life Science, Resources and Environment, Yichun University, Yichun, Jiangxi Province 336000, China)
Key Words:Hemibarbus maculates Bleeker; digestive system; morphology; histology; histochemistry
Abstract:Hemibarbus maculates Bleeker, a small freshwater Cyprinidae fish endemic to China, was of great commercial value. It was reported that its population size decreased remarkably inChinarecently due to the habitat destruction and overfishing. However, little was known about its digestive system. We collected 45 fishes from Yuanzhou section (E113°54′~114°37′, N27°33′~28°05′) ofYuanheRiverinYichun,Jiangxiprovince. Samples were embedded in paraffin, and sectioned into 5 μm and then stained with HE and PAS with AB, following routine procedures. Results showed that: (1) Digestive system included digestive tract and digestive glands, consisting of oropharyngeal cavity, esophagus, and intestine, anal, and liver pancreas, gallbladder. There was no stomach. (2) It had a lower u-shape mouth and a long pointed snout. The male had a larger mouth cleft length to snout length ratio. And the mucosa surface of oropharyngeal cavity was covered with squamous epithelium which contained taste buds and mucus secreting cells. (3) Esophageal was stubby, the forepart of which had taste buds. And the muscle layer was developed. The inner walls consisted of longitudinal ridges. Also the mucous layer was covered with numerous mucus secreting cells and goblet cells. There were significant differences in submucosa thickness and circular muscle layer thickness between esophagus and hindgut (P<0.01). And the surface of the columnar epithelium area was covered with brush borders. (4) The intestine which was composed of foregut, midgut and hindgut, was s-shape and lack of intestinal gland. The ratio of intestine length to body length was 0.98±1.29. The intestine wall was composed of the mucosa, submucosa, muscularis and serosa. (5) A large number of granule cells, positive to PAS and AB stain, were found in the mucous layer of esophagus and intestine. (6) The liver was elongated shape, and the gallbladder was surrounded by liver. Pancreas was distributed in the liver, spleen and intestine. The ratio of hepatopancreas weight to body weight (%) of males (1.83±0.64) was significantly higher than that of females (1.34±0.50) (P<0.05). (7) Relationship between body length and alimentary tract length was expressed as formulas: Y=1.1692L+1.2688 (R2=0.653).
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