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 acoustic characteristics of the large jellyfish Nemopilema nomurai in the East China Sea

동중국해에서 노무라입깃해파리의 in situ 음향산란특성

  • Yoon, Eun-A (Department of Fisheries Science, Chonnam National University) ;
  • Hwang, Doo-Jin (Division of Marine Technology, Chonnam National University) ;
  • Shin, Hyeong-Ho (Division of Marine Technology, Chonnam National University) ;
  • Gwa, Du-Seong (Division of Marine Technology, Chonnam National University) ;
  • Cha, Cheol-Pyo (Department of Fisheries Education, Pukyong National University)
  • 윤은아 (전남대학교 수산과학과) ;
  • 황두진 (전남대학교 해양기술학부) ;
  • 신형호 (전남대학교 해양기술학부) ;
  • 곽두성 (전남대학교 해양기술학부) ;
  • 차철표 (부경대학교 수해양산업교육과)
  • Received : 2012.05.11
  • Accepted : 2012.08.07
  • Published : 2012.08.31
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Abstract

The Nemopilema nomurai is a large jellyfish attaining a weight of 200 kg and bell diameter of 2 m when fully grown. To prevent damage to this species, this study determined the acoustic characteristics of N. nomurai using frequencies 38 and 120 kHz. The CPUE of N. nomurai and the averaged SV of 38 and 120 kHz had a lower (+) correlation coefficient and relationship at 120 kHz (R=0.51) than at 38 kHz (R=0.15) was significant. In addition, the averaged SV at 120 kHz was higher than at 38 kHz. The ${\Delta}MVBS_{120-38}$ in section catches ${\geq}97.8%$ wet mass of N. nomurai was -2.2 to 5.6 dB. The ${\Delta}TS_{120-38}$ in situ TS was extracted in sections catches of only N. nomurai by FMT. It was found that the averaged in situ ${\Delta}TS_{120-38}$ were at 0.6 and 0.1 dB. Furthermore, it results showed a close relationship between the bell diameter and TS of N. nomurai. The dominance of smaller N. nomurai (11.0~20.0 cm bell diameter in the air) corresponded to a similar proportion of low TS values (-69.0~-65.0 dB). A small number of larger N. nomurai (25.0~38.0 cm bell diameter in the air) were collected, in which TS values were the highest (-62.0~-58.0 dB).

Keywords

Acknowledgement

Grant : 한일주변해역에 있어서의 동물플랑크톤의 음향 산란층의 규명

Supported by : 한국연구재단

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