Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Comparison of Echogram Analysis Methods for Evaluating the Sound-scattering Layer

음향산란층의 식별을 위한 에코그램 분석 방법의 비교

  • Choi, Seok-Gwan (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • Yoon, Eun-A (Department of Fisheries Science, Chonnam National University) ;
  • Han, Inwoo (Department of Fisheries Science, Chonnam National University) ;
  • Oh, Wooseok (Department of Fisheries Science, Chonnam National University)
  • Received : 2016.11.15
  • Accepted : 2016.11.21
  • Published : 2016.12.31
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Abstract

This study compared the density of fish determined using three different echogram methods: the frequency-difference, time variable, and threshold modification methods. An acoustic survey was conducted off the coast of Jeju Island after sunset. Data at 38 and 120 kHz frequencies were collected using a commercial fishing vessel. As a reference point, the value of ${\Delta}MVBS_{120-38kHz}$ that distinguished fish from zooplankton using the 38 and 120 kHz frequencies was set at < 2 dB. The estimated density of fish along the survey line was 0.1-30.4, 0.1-64.3, and $0.1-51.7m^2/nmi^2$ using the frequency difference, time variable threshold, and threshold modification methods, respectively. The results of this study constitute basic research for estimating fish densities.

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References

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