RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (06): 841-846.doi: 10.11870/cjlyzyyhj201706006

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ASSEMBLAGE CHARACTERISTICS AND HISTORICAL CHANGES OF FISH IN THE XIAOJIANG RIVER OF THE THREE GORGE RESERVOIR

YE Xue-yao1, TAO Min1, ZHU Guang-pin2, HU Lin2, CHEN Fa-jun1, LI Bin1   

  1. 1. Key Laboratory of Sichuan Province for Fishes Conservation and Utilization in the Upper Reaches of the Yangtze River, School of Life Sciences, Neijiang Normal University, Neijiang 641100, China;
    2. The Water Resources Bureau of Kaixian City in Chongqing, Chongqing 405400, China
  • Received:2016-10-24 Revised:2016-12-12 Online:2017-06-20
  • Supported by:
    Demonstration Project and Water Environmental PreventionPlanning of Hanfeng Lake Reaches in Three Gorge Reservoir (2013ZX07104-004-005);Projectof Students Innovative and Pioneering,Neijiang Normal University (X201605)

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Abstract: To explore the status of fish assemblage characteristics and historical changes, investigations on fish assemblage were carried out in the Xiaojiang River of Three Gorges Reservoir in spring (May), autumn (September) and winter (December) of 2016. A total of 37 fish species were collected, belonging to 6 formes and 11 families, among which 2 species were endemic to the upper reaches of the Yangtze River, such as Hemiculer tchangi and Procypris rabaudi. Cypriniformes were dominant, accounting for 64.86% of the total species captured. The main commercial fish species were from the Cypriniformes, including Ctenopharyngodon idellus, Squaliobarbus curriculus, Elopichthys bambusa, Carassius auratus Cyprinus carpio, Hypophthalmichthys molitrix, and Aristichthys nobilis in the Xiaojiang River. Compared with the historical data, the similarity index is low (0.45), and the composition of the main commercial fishes were changed. At the same time, species diversity and resources of indigenous fish showed a declining trend and the endemic species had significant degradation, while the fish adapting to the hydrostatic or slow-flowing water environment was on the rise in the Xiaojiang River. Over exploitation, artificial drainage system construction, illegal dredging are potential underlying reasons for observed shifts in the fish assemblages. The results suggest that the reasonable drainage patterns (Hanfeng Lake) is of great significance to protect the indigenous fish resources in the Xiaojiang River

Key words: Xiaojiang River, fish assemblage, ecological guilds, biology diversity

CLC Number: 

  • S931.3
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