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Morphological Properties and Target Strength Characteristics for dark banded rockfish (Sebastes inermis)

볼락의 형태학적 특징과 음향반사강도 특성

  • Hwang, Bo-Kyu (Dept. of Marine Science & Production, Kunsan National University)
  • 황보규 (군산대학교 해양생산학과)
  • Received : 2015.01.30
  • Accepted : 2015.02.16
  • Published : 2015.02.28

Abstract

Morphological properties of dark banded rockfish (Sebastes inermis) were analysed to investigate its acoustic scattering characteristics. Total of 18 live samples was prepared for X-ray photos and collected morphological coordinates of their body and swim bladder shapes. Kirchhoff-ray mode model was used to calculate acoustic scattering pattern for broad-band frequency range. Inclination of swim bladder ranged from 17 to 30 and the averaged value was about $25.2^{\circ}$ (S.D.(standard deviation)=3.15). There were no any tendency of increase or decrease in volume and area ratio of swim bladder to fish body and ranged from 2.2 % to 4.43 % and 14.85 % to 21.31 %, respectively. The averaged value of volume and area ratio was 3.13 % (S.D.=0.52) and 17.6 % (S.D.=1.5). $b_{20}$ values were -69.01 for 38 kHz, -69.83 for 70 kHz, -70.17 for 120 kHz and -70.93 for 200 kHz, recpectively. Broadband acoustic patterns of dark banded rockfish for 20 ~ 200 kHz were similar among samples and they reflected size and morphological properties of fish species.

Keywords

Target strength;Kirchhoff-ray mode model;Dark banded rockfish;Broadband

Acknowledgement

Supported by : 군산대학교

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