文章基本信息

标题：Acoustic Observation of the Spawning Aggregation of Megalobrama hoffmanni in the Pearl River
本地全文：下载
作者：Xichang Tan ; Xinghui Li ; Jianbo Chang 等
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2009
卷号：24
期号：2
页码：293-299
DOI：10.1080/02705060.2009.9664295
出版社：Taylor & Francis
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.