Volume 18 Issue 3
Jun.  2022
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JIA Chunyan, WANG Ke, LI Huifeng, GAO Lei, YANG Hao, LIU Shaoping, CHEN Daqing, DUAN Xinbin. Spatial distribution and density changes of fish resources in East Dongting Lake during early fishing ban period[J]. South China Fisheries Science, 2022, 18(3): 48-56. DOI: 10.12131/20210148
Citation: JIA Chunyan, WANG Ke, LI Huifeng, GAO Lei, YANG Hao, LIU Shaoping, CHEN Daqing, DUAN Xinbin. Spatial distribution and density changes of fish resources in East Dongting Lake during early fishing ban period[J]. South China Fisheries Science, 2022, 18(3): 48-56. DOI: 10.12131/20210148
shu

Spatial distribution and density changes of fish resources in East Dongting Lake during early fishing ban period

  • 1.

    Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences/Fishery Resources and Environmental Science Experimental Station of the Upper-Middle Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan 430223, China

  • 2.

    Shanghai Ocean University/National Demonstration Center for Experimental Fisheries Science Education, Shanghai 201306, China

  • 3.

    Wuxi Fishery College, Nanjing Agricultural University, Wuxi 214081, China

  • 4.

    College of Fisheries Southwest University, Chongqing 400715, China

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  • Received Date: May 16, 2021
  • Revised Date: July 29, 2021
  • Accepted Date: September 02, 2021
  • Available Online: October 17, 2021
    Graphical Abstract
    • Abstract
  • In order to find out the density distribution of fish resources in the East Dongting Lake during the early fishing ban period, and provide data support for the effect evaluation of the fishing ban and the protection of fishery resources, we conducted the hydroacoustic surveys in the central area of the East Dongting Lake and the Xiangjiang floodway from November 2 to 8, 2020. The results show that the average target strength of fish in the survey area was −46.48 dB; the average body length was about 18.66 cm, and the body length ranged from 1.63 to 113.50 cm. The difference of fish target intensity between the different regions was significant. The average fish density in all the survey segments was 150.20 ind.· (1 000 m3)−1, ranging from 14.47 to 1 823.95 ind.· (1 000 m3)−1. The average fish density in the East Dongting Lake was greater than that in the Xiangjiang floodway, and there were significant differences in the average density of fish among different regions (P<0.05), highest at the confluence of rivers and lakes. Compared with the survey data of the East Dongting Lake before the fishing ban (2015), the average target intensity of fish after the fishing ban decreased, while the average density of fish increased significantly (P<0.05).
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