Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Estimation of demersal fish biomass using hydroacoustic and catch data in the marine ranching area (MRA) of Jeju

제주바다목장해역에서 수중음향과 어획데이터를 활용한 저층 어류의 현존량 추정

  • Lee, Jae-Bong (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Oh, Taeg-Yun (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Yeon, In-Ja (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Kim, Byung-Yeob (Ecology and Environment Division, Korea Fisheries Resource Agency) ;
  • Shin, Hyeon-Ok (Division of Marine Production System Management, Pukyong National University) ;
  • Hwang, Bo-Kyu (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, Kyung-Hoon (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Lee, Yoo-Won (Ship Operating Education Team, Korea Institute of Maritime and Fisheries Technology)
  • 이재봉 (국립수산과학원 자원연구과) ;
  • 오택윤 (국립수산과학원 자원연구과) ;
  • 연인자 (국립수산과학원 자원연구과) ;
  • 김병엽 (한국수산자원관리공단 제주지사 생태환경실) ;
  • 신현옥 (부경대학교 해양생산관리학부) ;
  • 황보규 (부경대학교 해양생산관리학부) ;
  • 이경훈 (국립수산과학원 시스템공학과) ;
  • 이유원 (한국해양수산연수원 운항교육팀)
  • Received : 2012.05.02
  • Accepted : 2012.05.25
  • Published : 2012.05.31
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Abstract

Hybrid surveys using hydroacoustic and fish sampling gears such as trammel net, trap were conducted to investigate total biomass, distribution and dominant fish species of the demersal fishes in the marine ranching area (MRA) of Jeju. Four surveys were carried out in June, August, October and November using 38kHz quantitative echo sounder. Catch data using trammel net and trap were used to calculate biomass and to examine dominant fish species. Fish schools were mainly detected in the waters of 20 meters below and around Chagwido waters. By the result of fishing experiments, fish species living in MRA of Jeju were about 40 species, dominant fish species of a detectable fish such as Family Sparidae and Family Monacanthidae etc. were identified 59.4~68.8% of total biomass. Based on the hydroacoustic data, fish length-weight function and target strength information, mean density of the demersal fish estimated were as follows; 0.88g/$m^2$ on June, 1.12g/$m^2$ on August, 1.35g/$m^2$ on October and 1.18g/$m^2$ on November. An estimated average biomass in MRA of Jeju was founded 20.5 tons in 2007, 20.6 tons in 2008, 23.0 tons in 2009, 25.9 tons in 2010. The results showed that biomass of MRA is getting increased slowly. Therefore the hybrid survey method using hydroacoustic and fish sampling gears is assured an effective biomass survey in the waters of mixed species.

Keywords

References

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