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| Digestive Tract Structure and Feeding Habits in Gymnocypris potanini firmispinatus |
| LIANG Ji1, XIONG Zhonghao 1, MA Daiqiang1, YAN Wenchu1, HE Chunlin1,2, LIU Hang1, XIONG Sen1 |
1. Chengdu Jncon Environmental Protection Technology Co., Ltd., Chengdu 611130, China;
2. The College of Life Sciences, Sichuan University, Chengdu 610041, China |
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Abstract In order to investigate the relationship between the structural characteristics of digestive tract and feeding habits of Gymnocypris potanini firmisinatus, 66 samples with body weight of 10—19 g and body length of about 10 cm were collected using traps and gill nets in the third level tributary of the Jinsha River, Sun Shui River, in early August and November 2022. Then the morphology, intestinal tissue structure, and dietary characteristics of the wild G. potanini firmisinatus were investigated by anatomical, histological, and gastric content analysis methods. It was found that the G. potanini firmispinatus has sub-hypognathous, blunt and hard cutin low jaw, and the intestine is divided into foregut, midgut and hindgut according intestinal nature turn. The histological observation showed that large and thick intestinal canal, numerous goblet cells and large absorption area were observed in foregut which the primary functions of storing, grinding, digesting foods and nutrition absorption. The midgut as one of the major absorption organs was featured by large absorption area, and the slender hindgut funetioned excretion and part of absorption functions, with absorption area of about 63.6% of the foregut. G. potanini firmispinatus feed algae, phytoplankton, zooplankton, benthic animals and aquatic vascular plants, with the dominant foods of algae and benthic animals. The findings indicate that G. potanini firmispinatus is a benthic omnivorous (prefer carnivorous) species, and has feeding habit corresponding to morphology and histological structure of digestive tract, and that the findings will provide theoretical basis for basic biology and digestive mechanism of G. potanini firmispinatus.
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Received: 07 December 2022
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