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


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.


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


Supported by : 군산대학교


  1. Clay CS and Horne JK. 1994. Acoustic models of fish: The Atlantic cod (Gadus morhua). J Acoust Soc Am 96, 1661-1668. (
  2. Gauthier S and Horne JK. 2011. Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models. Can J fish Aquat Sci 61, 1839-1850. (
  3. Horne JK. 2003. The influence of ontogeny, physiology, and behaviour on the target strength of walleye pollock (Theragra chalcogramma). ICES J Mar Sci 60, 1063-1074.(
  4. Horne JK and Jech JM. 1999. Multi-frequency estimates of fish abundance: constraints of rather high frequencies. ICES J Mar Sci 56, 184-199. (
  5. Imaizumi T, Furusawa M, Akamatsu T and Nishimori Y. 2008. Measuring the target strength spectra of fish using dolphin-like short broadband sonar signals. J Acoust Soc Am 124, 3440-3449. (
  6. Lee DJ, 2014. Bandwidth Enhancement of a Broadband Ultrasonic Mosaic Transducer using 48 Tonpilz Transducer Elements with 12 Resonance Frequencies. Kor J Fish Aquat Sci 47(3), 302-312. (
  7. Lee DJ, Kwak MS and Kang HY, 2014. Design and Development of a Broadband Ultrasonic Transducer Operating over the Frequency Range of 40 to 75 kHz. Kor J Fish Aquat Sci 47(3), 292-301. (
  8. Lee DJ and Shin HI. 2005. Construction of a Data Bank for Acoustic Target Strength with Fish Species, Length and Acoustic Frequency for Measuring Fish Size Distribution. J Kor Fish Soc. 38(4) 265-275.
  9. Lee JB, Yeon IJ, Kin BY, SHin HO, Hwang BK, Lee KH and Lee YW. 2012. Estimation of demersal fish biomass using hydroacoustic and catch data in the marine ranching area (MRA) of Jeju. J Kor Soc Fish Technol 48(2) 128-136. (
  10. Mun JH, Lee DJ, Shin HI and Lee YW. 2006. Fish length dependance of target strength for black rockfish, goldeye rockfish at 70 kHz and 120 kHz. J Kor Soc Fish Technol 42(1), 30-37.
  11. Kim HY, Hwang BK, Lee YW, Shin HO, Kwon JNa and Lee KH. 2011. Hydro-acoustic survey on fish distribution and aggregated fish at artificial reefs in marine ranching area. J Kor Soc Fish Technol 47(2) 139-145. (
  12. Son CW and Hwang DJ. 2002. Target strength of schlegel's black rockfish (Sebastes schlegeli) and red seabream (Pagrus major). Bull Korean Soc Fish Technol 38(2), 119-128.

Cited by

  1. Efficient eliminating methods of noises imbedded acoustic signals vol.51, pp.3, 2015,
  2. Target strength characteristics of sailfin sandfish (Arctoscopus japonicus) using ex situ experiment and acoustic model vol.51, pp.3, 2015,