Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Hydroacoustic Survey of Spatio-Temporal Distribution of Demersal Fish Aggregations Near the West Coast of Jeju Island, Korea

제주도 서쪽 연안에서 음향자원 조사를 이용한 저층 어군의 시.공간 분포

  • 강돈혁 (한국해양연구원 해양생물자원연구부) ;
  • 임양재 (국립수산과학원 제주수산연구소) ;
  • 이창원 (한국해양연구원 해양생물자원연구부) ;
  • 유준택 (국립수산과학원 제주수산연구소) ;
  • 명정구 (한국해양연구원 해양생물자원연구부)
  • Published : 2008.06.30
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Abstract

This study aims at assessment of spatio-temporal distribution of demersal fish aggregations near the west coast of Jeju Island using hydroacoustic survey. A 200 kHz split beam transducer attached to a small towed body was used for all acoustic investigations. The received acoustic data were in situ acoustic target strength (TS, dB) for all pings and nautical area scattering coefficient(NASC, $m^2/mile^2$) for 0.1 mile along 12 acoustic transects. Demersal fish aggregations are distributed around the coastal slope having 20 to 30 m depth throughout all seasons. The concentration is higher during the summer season. With regard spatial distribution, higher demersal fish aggregations have been detected near the West coast of Shinchang and especially near Chagwi-do. Pelagic fish aggregations were higher to the south of Chagwi-do during the spring season. Additionally, standing stock of demersal fish aggregations from the NASC data, TS function, and length-weight function of dominant species was estimated as follows: 3.2 ton (CV 21.8%) in December 2006, 17.9 ton (CV 21.6%) in April 2007, 30.8 ton (CV 17.8%) in June 2007, and 22.5 ton (CV 24.2%) in October 2007. The application of hydroacoustic methods offers a new approach to understanding spatiotemporal structure and estimate the biomass of demersal fish aggregations in the coastal area. And the results can be made up limitations of qualitative analysis through net and diving for fisheries resources survey in coastal area.

Keywords

References

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