Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Acoustic Target Strength Characteristics of Two Species of Multiple Jellyfishes, Aurelia aurita and Cyanea nozakii, in the Southern Coast of Korea

남해 연안에 분포하는 해파리(Aurelia aurita, Cyanea nozakii)의 복수 개체에 의한 음향 표적강도 특성

  • Kang, Don-Hyug (Marine Living Resources Research Department, KORDI) ;
  • Kim, Jung-Hun (Department of Environmental Marine Sciences, College of Science and Technology Hanyang University) ;
  • Lim, Seon-Ho (LIG Nex1, Maritime R&D Laboratory)
  • 강돈혁 (한국해양연구원 해양생물자원연구부) ;
  • 김정훈 (한양대학교 과학기술대학 해양환경과학과) ;
  • 임선호 (LIG넥스원(주), 연구개발본부 Maritime 연구센터)
  • Received : 2010.02.24
  • Accepted : 2010.03.24
  • Published : 2010.06.30
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Abstract

Understanding the abundance and distribution of massive jellyfish is necessary to forecast where or when their blooms will happen. The acoustic technique is one of the most useful methods of obtaining information if the acoustic characteristics of the targets are known. This study was conducted to determine the acoustic target strength (TS, dB) of two jellyfish species, Aurelia aurita and Cyanea nozakii, in the southern coast of Korea. For the ex situ measurements, 120, 200, and 420 kHz split beam transducers were used, and jellyfish with various bell lengths were arranged to prepare multiple jellyfish. Under 2 vertical individuals, the mean TS for multiple A. aurita at 120, 200, and 420 kHz was -72.7, -71.7, and -68.2 dB, respectively. In the case of 5 vertical individuals, the mean TS of the species was -71.3, -68.2, and -62.0 dB. Finally, the mean TS of C. nozakii at 120, 200, and 200 kHz was -62.0, -60.3, and -58.2 dB under 2 individuals and -58.1, -57.4, and -54.0 dB under 4 individuals, respectively. For both species, higher numbers of jellyfish resulted in a higher TS. In addition, higher frequencies were associated with a higher TS for the same jellyfish. These TS results for two species can be used as essential data for the acoustic detection of jellyfish in an open ocean or coastal area.

Keywords

References

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