Journal of Yangtze River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (12): 46-52.DOI: 10.11988/ckyyb.20201212

• WATER ENVIRONMENT AND WATER ECOLOGY • Previous Articles     Next Articles

Spatial Distribution and Habitat Characteristics of Fish Swarm in Fluctuating Backwater Zone of Three Gorges Reservoir in Impoundment Period

XU Guan-bing1,2, WANG Li1,2, YANG Sheng-fa1,2, YANG Wei2, PENG Yu-feng1,2, SUN Zhang1.2   

  1. 1. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
    2. National Engineering Research Center for Inland Waterway Regulation, Chongqing 400074, China
  • Received:2020-11-25 Revised:2021-07-05 Online:2021-12-01 Published:2021-12-15

Abstract: Impoundment in the Three Gorges Reservoir has remarkably changed the hydrodynamic conditions and sediment movement in the fluctuating backwater zone and has affected the fish habitat to varying degrees. The habitat characteristics and distribution of fish swarm in the fluctuating backwater zone of the Three Gorges Reservoir from Chongqing to Fuling was obtained by using the scientific echo sounder Bisonics DT-X). Results revealed no significant spatial distribution of water environmental factors in the study reach, implying that water environmental factors were not the major factors that affect the distribution of fish. Water depth and flow velocity, which varied notably, were key factors affecting fish habitat distribution. The average density of the eight fish swarm was (64.6±13.5) ind/(103 m3), and the fish swarm was dominated by small and medium-sized fish whose average body length was (16.8±4.6)cm. The backwater pool, deep pool and branching channel are fish’s favorite habitat sections. The results provided scientific basis for fish protection and habitat restoration in the fluctuating backwater zone of the Three Gorges Reservoir.

Key words: fish distribution, habitat characteristics, Three Gorges Reservoir, fluctuating backwater area, impoundment period, hydroacoustic

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