Development of an acoustic-optical system to estimate target-strengths and tilt angles from fish aggregations
Development of an acoustic-optical system to estimate target-strengths and tilt angles from fish aggregations
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DOI：
10.1109/oceans.2004.1402949
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
K. Sawada;H. Takahashi;Y. Takao;K. Watanabe;J. Horne;S. McClatchie;K. Abe
中科院分区：
文献类型：
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作者：
K. Sawada;H. Takahashi;Y. Takao;K. Watanabe;J. Horne;S. McClatchie;K. Abe
J-QUEST 仪器包包括定量 70 kHz 分束回声测深仪和立体声电视摄像机，正在开发用于观察中层鱼类。对鱼群中单条鱼进行原位声学和光学测量，包括游动速度、目标强度、长度和倾斜角度。通过甲板上的光功率复合电缆和接收器实时监控声音数据和两个视频信号。 J-QUEST 是从 R/V Kaiyo-maru 部署在从鹿岛滩到日本东部三陆海岸的黑潮瞬息水域中。 J-QUEST 从水面到 200 m 的深度都被拴住，并且运行良好。在鹿岛滩水深10m处，秋刀鱼（Cololabis saira）被水下灯光吸引，在J-QUEST周围形成大群。我们可以通过电视监视器和回波图来监测鱼类。秋刀鱼的平均目标强度为 -37.9 dB，归一化 TS（按平方叉长度）为 -66.8 dB
The J-QUEST instrument package, a quantitative 70 kHz split-beam echo sounder and a stereo TV camera, is being developed to observe mesopelagic fish. In situ acoustic and optical measurements of single fish within aggregations include swimming speed, target strength, length, and tilt angle. Acoustic data and two video signals are monitored in real-time via an optical-power composite cable and receivers on deck. The J-QUEST was deployed from the R/V Kaiyo-maru in the transient waters of the Kuroshio current from Kashima-nada to off the coast of Sanriku in the east of Japan. J-QUEST was tethered from the surface to a depth of 200 m and worked well. In Kashima-nada at a depth of 10 m, Pacific saury (Cololabis saira) were attracted to the underwater lights and formed a large aggregation around J-QUEST. We could monitor fish on both the TV monitors and on the echogram. Average target strength of Pacific saury was -37.9 dB and normalized TS (by squared fork length) was -66.8 dB