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首页> 外文会议>OCEANS - MTS/IEEE Kobe Techno-Oceans >Acoustic Distinction Between Pointhead Flounder and Juvenile Walleye Pollock by Echo Shape and Frequency Characteristics
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Acoustic Distinction Between Pointhead Flounder and Juvenile Walleye Pollock by Echo Shape and Frequency Characteristics

机译：回声形状和频率特性在点状比目鱼和幼年角膜白Pol之间的声学​​区别

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摘要

This study addresses the methods for distinguishing the pointhead flounder Cleisthenes pinetorum from the juvenile walleye pollock Gadus chalcogrammus in and near Funka Bay, Hokkaido, Japan. Acoustics data of th Gadus chalcogrammus e fish were monitored using a Simrad EK60 (38, 120, 200 kHz) split-beam echo sounder, and biological samples were collected using a rod for the pointhead flounder and a frame-type midwater trawl for the juvenile walleye pollock. The pointhead flounder schools presented a patch shaped echo on the echograms and showed strong scattering at all three frequencies, whereas the distribution patterns of the juvenile walleye pollock schools were layered. The volume backscattering strength (SV) of the target schools extracted from the echograms showed that the pointhead flounder presented a higher SV at high frequency, which is consistent with the early surveys of other bladderless fish. In contrast, the juvenile walleye pollock showed higher SV at low frequency, which also agreed with the early surveys.
机译：这项研究提出了在日本北海道Funka湾及其附近地区，将点状比目鱼Cleisthenes pinetorum与少年角膜白eye Gadus chalcogrammus区别开来的方法。使用Simrad EK60（38、120、200 kHz）分束式回声测深仪监测Gadus蓝藻鱼类的声学数据，并使用鱼竿捕捞尖头比目鱼，并使用框架式水下拖网捕捞生物样本。角膜白斑鳕。尖头比目鱼群在回波图上呈现出斑块状回声，并且在所有三个频率上均显示出强散射，而幼年角膜狭鳕学校的分布模式是分层的。从回波图中提取的目标鱼群的体积后向散射强度（SV）表明，尖头比目鱼在高频下呈现出较高的SV，这与早期对其他无bladder鱼的调查一致。相比之下，幼年角膜鳕在低频时显示出较高的SV，这也与早期调查一致。

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