Feeding habits of an endemic fish, Oxygymnocypris stewartii, in the Yarlung Zangbo River in Tibet, China

Environmental Biology of Fishes
By: , and 

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Abstract

Feeding habits of Oxygymnocypris stewartii were investigated based on monthly sampling in the Yarlung Zangbo River from August 2008 to August 2009. The gut contents of 194 individuals were analysed and quantified with numerical and gravimetric methods. This species can be considered a generalized and opportunistic predator feeding both on teleosts and aquatic insects. A multivariate analysis revealed noticeable variation in O. stewartii diet composition with fish size and season. The smaller specimens fed primarily on Cobitidae and Hydropsychidae. As they grew, Cyprinidae and Chironomidae larvae became important prey. The preferred food items were teleosts in summer and autumn. For winter and spring, the predominant prey switched to chironomidae larvae. Diet composition did not significantly vary between the sexes. Finally, a significant and positive correlation between predator and prey length was found. These findings provide the fundamental information better understanding the role of this important endemic species in the Yarlung Zangbo River food web.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Feeding habits of an endemic fish, Oxygymnocypris stewartii, in the Yarlung Zangbo River in Tibet, China
Series title Environmental Biology of Fishes
DOI 10.1007/s10641-013-0213-8
Volume 97
Issue 11
Year Published 2014
Language English
Publisher Springer
Contributing office(s) Great Lakes Science Center
Description 15 p.
First page 1279
Last page 1293
Country China
State Tibet
Other Geospatial Yarlung Zangbo River
Online Only (Y/N) N
Additional Online Files (Y/N) N