Ex situ acoustic target strength by tilt angle and pulsation of moon jellyfish (Aurelia aurita) using frequency 70 kHz

주파수 70 kHz를 이용한 보름달물해파리의 유영 자세각과 박동에 따른 초음파산란강도

  • YOON, Eun-A (Division of Marine Technology, Chonnam National University) ;
  • HWANG, Doo-Jin (Division of Marine Technology, Chonnam National University) ;
  • HIROSE, Miyuki (Division of Marine Technology, Chonnam National University) ;
  • SAWADA, Kouichi (National Research Institute of Fisheries Engineering, Fisheries Research Agency) ;
  • FUKUDA, Yoshiaki (National Research Institute of Fisheries Engineering, Fisheries Research Agency) ;
  • MUKAI, Tohru (Faculty of Fisheries Sciences, Hokkaido University)
  • Received : 2015.05.11
  • Accepted : 2015.08.28
  • Published : 2015.08.31


Target strength (TS) information is an important parameter that estimates the detection, distribution, and abundance of Aurelia aurita. In order to investigate the biological TS of jellyfish, some factors such as size (bell diameter), tilt angle, pulsation, and symbion should be known. In the ex situ TS measurements, the tilt angles and pulsation from synchronized swimming behavior of four live A. aurita (bell diameters in the air: 54.2 ~ 94.2 mm) were measured with the acoustic data at 70 kHz. The reduced target strength (RTS) of A. aurita was found to change ranged from 13.4 ~ 16.5 dB according to the incidence angles from $-30^{\circ}$ to $24^{\circ}$. When the change rate of bell diameter in the water was 0.2, the TS value showed a 7.2 dB change. These results could be utilized as an important data to understand the acoustic characteristic scattering of A. aurita.


Target strength;Jellyfish;Aurelia aurita;Pulsation


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