Cite this paper:
LIAN Yuxi, HUANG Geng, Małgorzata GODLEWSKA, CAI Xingwei, LI Chang, YE Shaowen, LIU Jiashou, LI Zhongjie. Hydroacoustic estimates of fish biomass and spatial distributions in shallow lakes[J]. HaiyangYuHuZhao, 2018, 36(2): 587-597

Hydroacoustic estimates of fish biomass and spatial distributions in shallow lakes

LIAN Yuxi1,2,3, HUANG Geng1,3, Małgorzata GODLEWSKA4, CAI Xingwei1,3, LI Chang1,3, YE Shaowen1, LIU Jiashou1, LI Zhongjie1
1 State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
2 Research Center of Aquatic Organism Conservation and Water Ecosystem Restoration in Anhui Province, Anqing Normal University, Anqing 246133, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 Polish Academy of Sciences, European Regional Centre for Ecohydrology, ul. Tylna 3, 90 36;4 Łódź, Poland
Abstract:
We conducted acoustical surveys with a horizontal beam transducer to detect fish and with a vertical beam transducer to detect depth and macrophytes in two typical shallow lakes along the middle and lower reaches of the Changjiang (Yangtze) River in November 2013. Both lakes are subject to active fish management with annual stocking and removal of large fish. The purpose of the study was to compare hydroacoustic horizontal beam estimates with fish landings. The preliminary results show that the fish distribution patterns differed in the two lakes and were affected by water depth and macrophyte coverage. The hydroacoustically estimated fish biomass matched the commercial catch very well in Niushan Lake, but it was two times higher in Kuilei Lake. However, acoustic estimates included all fish, whereas the catch included only fish >45 cm (smaller ones were released). We were unable to determine the proper regression between acoustic target strength and fish length for the dominant fish species in the two lakes.
Key words:    horizontal hydroacoustics|assessment of fish abundance|fisheries management|Chinese shallow lakes|spatial distribution   
Received: 2016-09-07   Revised:
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Articles by LIAN Yuxi
Articles by HUANG Geng
Articles by Małgorzata GODLEWSKA
Articles by CAI Xingwei
Articles by LI Chang
Articles by YE Shaowen
Articles by LIU Jiashou
Articles by LI Zhongjie
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