Acoustic Observation of the Spawning Aggregation of Megalobrama hoffmanni in the Pearl River

文献类型： 外文期刊

第一作者： Tan, Xichang

作者： Tan, Xichang;Li, Xinghui;Tan, Xichang;Tan, Xichang;Chang, Jianbo;Tao, Jiangpin;Chang, Jianbo;Tao, Jiangpin

作者机构：

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.

分类号： Q17

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