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青皮塘产卵场广东鲂繁殖群体的水声学探测

谭细畅1,2;李新辉1;陶江平2;赖子尼1;罗建仁1;李捷1;王超1   

  1. 1中国水产科学研究院珠江水产研究所, 广州 510380;2中国科学院水生生物研究所, 武汉 430072
  • 收稿日期:2007-07-24 修回日期:1900-01-01 出版日期:2008-05-10 发布日期:2008-05-10

Hydroacoustic measurement of spawning stocks of Megalobrama hoffmanni in Qingpitang reach of Xijiang River.

1Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;2Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China   

  1. 1Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;2Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
  • Received:2007-07-24 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10

摘要: 2006年4—5月利用Simrad EY60型分束回声探测仪对青皮塘广东鲂产卵场的繁殖群体进行定点横向探测及航行垂直探测。在人工标定及同步渔获物统计的基础上,对广东鲂的回声信号进行了判别。结果表明:广东鲂在青皮塘产卵场有明显的聚集、逗留行为,其游动速度(均值0.24 m·s-1)低于其他鱼类(均值0.49 m·s-1);广东鲂繁殖个体目标强度的范围为-33.8~-52.3 dB,均值为-42.2 dB;4月27日—5月1日,广东鲂在青皮塘的聚群过程约经历了4 d;初步估算5月1日青皮塘产卵场广东鲂繁殖群体数量为9.8×104 ind,资源量约48 t。实验证明,采用定点探测的方式对广东鲂繁殖群体研究是行之有效的,采集到的广东鲂回声信号特征明显,容易判别。

关键词: 生物除磷, 聚磷酸盐, 微生物

Abstract: With Simrad EY60 split-beam echosounder, the spawning stocks of Megalobrama hoffmanni in Qingpitang spawning grounds were observed from April to May, 2006. The echoes from M. hoffmanni were identified by its distinctive characteristics, and the ancillary information from gill nets sampling and tethered fish measurements of target strength were also important. The results showed that the aggregation and lingering behaviors of M. hoffmanni were obvious. During the period of aggregation, the average swimming speed of M. hoffmanni was 0.24 m·s-1, being lower than the corresponding value of ther fishes (0.49 m·s-1). The target strength of M. hoffmanni in situ ranged from -33.8 to -52.3 dB, with an average of -42.2 dB. From April 27 to May 1, M. hoffmanni migrated to Qingpitang spawning grounds gradually, and the peak density appeared. In May 1, the number of spawning fish was about 98 000, and the total mass was 48 tones. Our results indicated that the stationary acoustic observation method for M. hoffmanni identification and discrimination was effective.

Key words: Biological phosphorus removal, Polyphosphate, Microorganism