Visual census and hydro-acoustic survey of demersal fish aggregations in Ulju small scale marine ranching area (MRA), Korea

수중촬영조사법과 음향자원조사법을 활용한 울주군 연안 소규모 바다목장 해역의 어류 군집 조사

  • Hwang, Bo-Kyu (Dept. of Marine Science & Production, Kunsan National University) ;
  • Lee, Yoo-Won (Education and Research Team, Korea Institute of Maritime and Fisheries Technology) ;
  • Jo, Hyun-Su (Dept. of Marine Science & Production, Kunsan National University) ;
  • Oh, Jeong-Kyu (Korea Ecology Institute Co., Ltd.) ;
  • Kang, Myounghee (Dept. of Maritime Police and Production System, The institute of Maritime Industry, Gyeongsang National University)
  • 황보규 (군산대학교 해양생산학과) ;
  • 이유원 (한국해양수산연수원 교육연구팀) ;
  • 조현수 (군산대학교 해양생산학과) ;
  • 오정규 (한국생태연구원 (주)) ;
  • 강명희 (경상대학교 해양경찰시스템학과)
  • Received : 2014.08.27
  • Accepted : 2015.02.11
  • Published : 2015.02.28


Visual census and hydro-acoustic survey was carried out at Ulju small scale marine ranching area (MRA) to estimate demersal fish aggregations on September and November 2013. In this hydro-acoustic survey, the authors combined an image sonar with a scientific echo sounder to monitor an underwater situation and compare two acoustic data. Consequently, visual census survey was useful to estimate fish species composition for hydro-acoustic survey, because it is easy to identify aggregated fish species and overcome limits on a fishing depth and ability of an conventional fishing gear like a bottom gill-net or a fish trap at marine ranching area. Mean fish density was estimated as $0.757g/m^2$ on September and $0.219g/m^2$ on November and Fish abundance was finally calculated as 1.51ton (coefficient of variation, CV=13.1%) on September and 0.44ton (CV=47.7%) on November, respectively. Hydro-acoustic survey combined with the image sonar was useful to monitor fish aggregations and estimate fish stocks around artificial reefs at shallow coastal MRA. We were able to easily identify the underwater structures like an artificial reef and a fishing rope as well as fish aggregations from image sonar data. Therefore, the method was effective to separate unwanted echo signals in acoustic data of scientific echo sounder.


  1. Clay CS and Horne JK. 1994. Acoustic models of fish: The Atlantic cod (Gadus morhua). J Acoust Soc Am 96 (3), 1661-1668. (DOI: 10.1121/1.410245)
  2. Gauthier S and Horne JK. 2004. Acoustic characteristics of forage fish species in the gulf of Alaska and bering sea based on Kirchoff-approximation models. Can J Aquat Sci 61, 1839-1850. (DOI: 10.1139/f04-117)
  3. Hwang KS, Lee KH and Hwang BK. 2012. Verification and application of Target Strength for Japanese anchovy (Engraulis japonicas) by theoretical acoustic scattering model. J Kor Soc Fish Tech 48(4), 487-494. (DOI: 10.3796/KSFT.2012.48.4.487)
  4. Kang DH, Im YJ, Lee CW, Yoo JT and Myoung JG. 2008. Hydroacoustic Survey of Spatio-Temporal Distribution of Demersal Fish Aggregation Near the West Coast of Jeju Island, Korea. Ocean and Polar Res 30(2), 181-191. (DOI: 10.4217/OPR.2008.30.2.181)
  5. Kim HY, Hwang BK, Lee YW, Shin HO, Kwon JN and Lee KH. 2011. Hydro-acoustic survey on fish distribution and aggregated fish at artificial reefs in marine ranching area. J Kor Soc Fish Tech 47(2), 139-145. (DOI: 10.3796/KSFT.2011.47.2.139)
  6. Lee JB, Oh TY, Yeon IJ, Kim 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 Tech 48(2), 128-136. (DOI: 10.3796/KSFT.2012.48.2.128)
  7. Lee DJ. 2005. Fish length dependence of acoustic target strength for 12 dominant fish species caught in the Korean waters at 75 kHz. J Kor Soc Fish Tech 41(4), 296-305.
  8. Lee DJ. 2010. 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. J Kor Soc Fish Tech 46(3), 239-247. (DOI: 10.3796/KSFT.2010.46.3.239)
  9. 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.
  10. Lee SJ, Lee YW, Kim JI, Oh TY, Hwang BK, Kim BY and Lee KH. 2010. Target strength estimation of dominant species in marine ranching ground of Jeju coastal water by KRM model. J Kor Soc Fish Tech 46(2), 157-163. (DOI:10.3796/KSFT.2010.46.2.157)

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