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 distribu...
【英文摘要】
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 distribu...
【基金】
Supported by the Special Scientific Research Fund of Agriculture Public Welfare Profession of China(No.201303056);
the State Key Laboratory of Freshwater Ecology and Biotechnology(No.2011FBZ28);
the Science and Technology Research Project of China Three Gorges Corporation(No.CT-12-08-01)
【更新日期】
2018-07-24
【分类号】
S931
【正文快照】
1 INTRODUCTIONShallow lakes are usually abundant with fi sh andprovide plenty of fi sh production.However,fi shresources in lakes are seriously threatened byenvironmental pollution,overfi shing,and obstaclesbetween rivers and lakes(Allan and Castillo,2007
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