Ocean Science Journal

, Volume 53, Issue 1, pp 73–79 | Cite as

Target-strength Measurements of Sandfish Arctoscopus japonicus

  • Eun-A Yoon
  • Kyounghoon Lee
  • Wooseok Oh
  • Junghwa Choi
  • Kangseok Hwang
  • Myounghee Kang
Article
  • 32 Downloads

Abstract

The goal of this study was to estimate the target strength (TS) of the sandfish Arctoscopus japonicus using in-situ and ex-situ methods with an echosounder. For the in-situ TS measurement, the survey was conducted by taking hydroacoustic measurements at 38 and 120 kHz and using a coastal gill net, in Goseong, in the northeastern sea of Korea in early December 2009. Ex-situ measurement of TS used live specimens and the tethering method, and was conducted at 120 kHz. The distribution of fork length (FL) was bimodal: 14.6–19.8 cm (n = 241 individuals, mean = 17.0 cm) for males and 16.3–24.5 cm (n = 105 individuals, mean = 19.6 cm) for females. The in-situ TS ranged from −79.8 to −59.1 dB (mean = −74.3 dB for males and −64.1 dB for females) at 38 kHz and −79.9 to −56.2 dB (mean = −74.3 dB for males and −64.1 dB for females) at 120 kHz. The mean TS of females was approximately 10 dB higher than that of males at each dominant frequency. The female ex-situ TS values ranged from 68.5 to −54.6 dB, and those of males was from −67.7 to −59.3 dB. The mean TS value for females was 2.9 dB higher than that of males. These results may be used in echo-integration surveys of sandfish to estimate their abundance and seasonal distribution.

Keywords

Target Strength hydroacoustics in-situ ex-situ Arctoscopus japonicus 

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Copyright information

© Korea Institute of Ocean Science & Technology (KIOST) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • Eun-A Yoon
    • 1
  • Kyounghoon Lee
    • 1
  • Wooseok Oh
    • 1
  • Junghwa Choi
    • 2
  • Kangseok Hwang
    • 3
  • Myounghee Kang
    • 4
  1. 1.School of Marine TechnologyChonnam National UniversityYeosuKorea
  2. 2.Fisheries Resources Research CenterNational Institute of Fisheries ScienceTongyeongKorea
  3. 3.Fisheries Resources Management DivisionNational Institute of Fisheries ScienceBusanKorea
  4. 4.Department of Maritime Police and Production System, College of Marine ScienceGyeongsang National UniversityTongyeongKorea

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