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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Variation of target strength by swimming orientation and size for Pacific herring (Clupea pallasii) at the frequency of 70-kHz

주파수 70 kHz를 이용한 청어의 유영자세각과 체장에 따른 초음파산란강도의 변동

  • PARK, Miseon (Southeast Sea Fisheries Research Institute) ;
  • YOON, Euna (School of Marine Technology, Chonnam National University) ;
  • HWANG, Kangseok (Fisheries Resources Management Division, National Institute of Fisheries Science) ;
  • LEE, Donggil (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • OH, Wooseok (Department of Fisheries Sciences, Chonnam National University) ;
  • LEE, Kyounghoon (School of Marine Technology, Chonnam National University)
  • 박미선 (남동해수산연구소) ;
  • 윤은아 (전남대학교 해양기술학부) ;
  • 황강석 (국립수산과학원 연근해자원과) ;
  • 이동길 (국립수산과학원 수산공학과) ;
  • 오우석 (전남대학교 수산과학과) ;
  • 이경훈 (전남대학교 해양기술학부)
  • Received : 2017.10.12
  • Accepted : 2017.11.25
  • Published : 2017.11.30
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Abstract

We measured the target strength according to the swimming tilt angle and size change for Pacific herring at the frequency of 70 kHz as the basic database in order to estimate its abundance as well as density in the survey area using the hydroacoustical method. The number of the sample used in this study was 14 individuals, and its size distribution by fork length ranged between 20.3 and 29.8 cm and wet weight was measured between 187.6 and 269.9 g. The variation of TS according to the swimming angle ($-30{\sim}30^{\circ}$) was measured between 10.3 and 18.8 dB in frequency range, the highest value was measured at head-down of Pacific herring in the tilt angle range between 5 and 9 deg. of its swimbladder. The relationship between TS-FL of herring was the same as $TS=20log_{10}$ (FL) - 66.79 when its swimming tilt angle in the daytime ($3.8{\pm}6.0^{\circ}$) and nighttime ($-3.2{\pm}13.6^{\circ}$), respectively.

Keywords

References

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