Acoustic Observation of the Spawning Aggregation of Megalobrama hoffmanni in the Pearl River
文献类型: 外文期刊
作者: Tan, Xichang 1 ; Li, Xinghui 1 ; Chang, Jianbo 4 ; Tao, Jiangpin 4 ;
作者机构: 1.Chinese Acad Fishery Sci, Pearl River Fishery Res Inst, Guangzhou 510380, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
4.Minist Water Resources, Inst Hydroecol, Wuhan 430079, Peoples R China
5.Chinese Acad Sci, Wuhan 430079, Peoples R China
关键词: Spawning;Acoustics;Rivers;Migration;Boats;Light effects;Spawning grounds;Fisheries;Megalobrama hoffmanni
期刊名称:JOURNAL OF FRESHWATER ECOLOGY ( 影响因子:1.132; 五年影响因子:1.593 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Using the Simrad EY60 split-beam echosounder, the spawning aggregation of Megalobrama hoffmanni was observed at the Luopang spawning grounds in the Pearl River, China, from April 19 to 22 2006. With the boat anchored, the transducer was stationary and was aimed horizontally to monitor the migration of the fish. Using fishery information, the echoes of M. hoffmanni were identified. The results showed that the spawning aggregation of M. hoffmanni at Luopang was obvious and easy to discriminate. The target strength of M hoffmanni in situ ranged from -33.8 dB to -52.3 dB (average 42.2dB). The aggregation of M. hoffmanni was obviously affected by light. With a speed of -0.31 m/s, 88.9% of the spawning stocks migrated upstream. Most M hoffmanni were recorded moving near the bottom. Their distinctive acoustic signature demonstrated the suitability of the stationary acoustic observation for M. hoffmanni identification and discrimination.
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