Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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In situ behavioral and acoustic characteristics of the large jellyfish Nemopliema nomurai by target tracking

수중음향을 이용한 노무라입깃해파리의 행동 및 음향산란특성

  • Yoon, Eun-A (Division of Marine Technology, Chonnam National University) ;
  • Hwang, Doo-Jin (Division of Marine Technology, Chonnam National University) ;
  • Shin, Hyeong-Ho (Division of Marine Technology, Chonnam National University)
  • 윤은아 (전남대학교 해양기술학부) ;
  • 황두진 (전남대학교 해양기술학부) ;
  • 신형호 (전남대학교 해양기술학부)
  • Received : 2015.01.29
  • Accepted : 2015.05.31
  • Published : 2015.05.31
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Abstract

The aim of this study is to find out the behavior and acoustic backscattering of the large jellyfish Nemopliema nomurai using hydroacoustics in situ. N. nomurai was distributed at depths ranging from 10~15 m during the day. Regarding the behavior of N. nomurai, there was no significant change in depth, and 3D tortuosity was not high. The vertical direction was ${\pm}10^{\circ}$ from the horizontal, and moving speed was $0.9{\sim}1.5\;m\;s^{-1}$. With regard to hydro-acoustical characteristics, the mean TS of N. nomurai ranged from -69.6~-56.0 dB at 38 kHz and -69.4~-54.5 dB at 120 kHz. TS variation (Max TS-Min TS) at 38 and 120 kHz was 0~10.2 dB and 0.2~16.0 dB, respectively. Mean TS and TS variation (Max TS-Min TS) of N. nomurai were higher at 120 kHz than at 38 kHz. The results showed that the use of hydroacoustics was effective in estimating the distribution depth, behavior, and acoustic characteristics of the target.

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References

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