Fish length dependence of acoustic target strength for 12 dominant fish species caught in the Korean waters at 75 kHz

한국 연근해에서 어획된 주요 12어종의 75 kHz에 대한 음향 반사 강도의 체장 의존성

  • Lee, Dae-Jae (Department of Marine Production System Engineering, Pukyong National University)
  • 이대재 (부경대학교 해양생산시스템공학과)
  • Published : 2005.11.30


Acoustic target strength (TS) of 12 commercially important fish species caught in the Korean waters had been investigated and their results were presented. Laboratory measurements of target strength on 12 dominant fish species were carried out at a frequencies of 75 kHz by single beam method under the controlled condition of the water tank with the 241 samples of dead and live fishes. The target strength pattern on individual fish of each species was measured as a function of tilt angle, ranging from $-45^{\circ}$ (head down aspect) to $45^{\circ}$ (head up aspect) in $0.2^{\circ}$ intervals, and the averaged target strength was estimated by assuming the tilt angle distribution as N ($-5.0^{\circ}$, $^15.0{\circ}$). The 75 to fish length relationship for each species was independently derived by a least - squares fitting procedure. Also, a linear regression analysis for all species was performed to reduce the data to a set of empirical equations showing the variation of target strength to fish length and fish species. An empirical model for fish target strength(TS, dB) averaged over the dorsal aspect of 158 fishes of 7 species and which spans the fish length(L, m) to wavelength(${\lambda}$, m) ratio between 6.2 and 21.3 was derived: TS: 27.03 Log(L)-7.7Log(${\kanbda}$)-17.21, ($r^2$=0.59).


Averaged target strength;Length dependence;Single beam method;Tilt angle, Laboratory measurement


  1. Foote, K.G., A. Aglen and O. Nakken, 1986. Measurement offish target strength with split - beam echo sounder. J. Acoust. Soc. Am., 80(2), 612 - 621
  2. Gauthier, S. and G.A. Rose, 2001. Target strength of encaged Atlantic redfish (Sebastes spp.). ICES J. Mar. Sci., 58(3), 562 - 568
  3. Kang, H.Y. and D.J. Lee, 2003. Fish length dependence of acoustic target strength for large yellow croaker. Bull. Kor. Soc. Fish. Technol., 39(3), 239 - 248
  4. Kang, D.H., D.J. Hwang, T. Mukai, K. Iida and K.H. Lee, 2004. Acoustic target strength of live Japanese common squid (Todarodes pacifica) for applying biomass estimation. J. Kor. Fish. Soc., 37(4), 345 - 353
  5. Kang, D.H., K. Sadayasu, T. Mukai, K. Iida, DJ. Hwang, K. Sawada and K. Miyashita, 2004. Target strength estimation of black porgy Acanthopagrus schlegeli using acoustic measurements and a scattering model. Fish. Sci., 70(5), 819-828.
  6. Lee, D.J., and H.I. Shin, 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
  7. Love, R.H., 1971. Measurements of fish target strength: a review. Fish. Bull., 69(4), 703 -715
  8. Mukai, T., N. Sano, K. lida and S. Sakai, 1993. Relation between dorsal aspect target strength of fish caught in the East China Sea and their swimbladder. Nippon Suisan Gakkaishi, 60(2), 215 - 222
  9. Mukai, T., N. Sano, K. Iida and S. Sakai, 1993. Studies on dorsal aspect target strength of ten species of fish collected in the East China Sea. Nippon Suisan Gakkaishi, 59(9),1515 - 1525
  10. Foote, K.G., 1980. Averaging of fish target strength functions. J. Acoust. Soc. Am., 67(2), 504 - 515
  11. Foote, K.G. and D.I. Francis, 2002. Comparing Kirchhoffapproximation and boundary - element models for computing gadoid target strenths. J. Acoust. Soc. Am., 111(4),1644-1654
  12. Dahl, P.H. and O.A. Mathisen, 1983. Measurement of fish target strength and associated directivity at high frequencies. J. Acoust. Soc. Am., 73(4), 1205 - 1211

Cited by

  1. Fish length dependence of target strength for striped beakperch, bluefin searobin and konoshiro gizzard shad caught in the artificial reef ground of Yongho Man, Busan vol.46, pp.3, 2010,
  2. Target strength estimation of dominant species in marine ranching ground of Jeju coastal water by KRM model vol.46, pp.2, 2010,
  3. Visual census and hydro-acoustic survey of demersal fish aggregations in Ulju small scale marine ranching area (MRA), Korea vol.51, pp.1, 2015,
  4. Verification and application of Target Strength for Japanese anchovy (Engraulis japonicas) by theoretical acoustic scattering model vol.48, pp.4, 2012,
  5. Multifrequency acoustic scattering characteristics of jack mackerel by KRM model vol.51, pp.3, 2015,
  6. The Frequency and Length Dependence of the Target Strength of the Largehead Hairtail (Trichiurus lepturus) in Korean Waters vol.12, pp.2, 2009,
  7. Backscattering strength and vertical distribution of dominant fishes in inland waters by hydroacoustics vol.50, pp.4, 2014,