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A study on calibration for commercial split beam echosounder using the bottom backscattering strength from a fishing vessel near the South Shetland Islands, Antarctica

남극 남쉐틀랜드 군도 주변 해저면 음향신호를 이용한 상업용 어군탐지기 보정 연구

  • CHOI, Seok-Gwan (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Hyungbeen (Fisheries Resources and Environment Research Division West Sea Fisheries Research Institute) ;
  • LEE, Kyounghoon (School of Marine Technology, Chonnam National University) ;
  • LEE, Jaebong (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science)
  • 최석관 (국립수산과학원 원양자원과) ;
  • 이형빈 (서해수산연구소 자원관리과) ;
  • 이경훈 (전남대학교 해양기술학부) ;
  • 이재봉 (국립수산과학원 원양자원과)
  • Received : 2016.10.13
  • Accepted : 2016.11.19
  • Published : 2016.11.30

Abstract

Commercial split beam echosounder (ES70) installed on a krill fishing vessel was calibrated in order to utilize it in estimating biomass of Antarctic krill (Euphausia superba). The method of calibration was to analyze the difference between the bottom backscattering strength of the commercial split beam echosounder (i.e. ES70) and the scientific echosounder (i.e. EK60) at one of transects near South Shetland Islands designated by CCAMLR. 38 kHz and 120 kHz were used for the calibration, and krill swarm signal levels obtained from multi frequencies, was examined to verify the calibration result. The analysis result indicated possibility of calibration by bottom backscattering strength, since the proportion of krill swarm signals within 2 dB < $S_{V\;120\;kHz-38\;kHz}$ < 12 dB (i.e. a common $S_{V\;120\;kHz-38\;kHz}$ range of 38 kHz and 120 kHz to be an indicator of Antarctic krill) over the total acoustic signals were 26.95% and 92.04%, respectively before and after the calibration.

Keywords

Fishing vessel;Commercial split beam echosounder (ES70);Scientific echosounder (EK60);Antarctic krill (Euphausia superba);Calibration

Acknowledgement

Supported by : 국립수산과학원

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