주파수차법을 이용한 남극크릴(Euphausia superba)의 종 식별에 관한 연구
Species Identification of Antarctic Krill Euphausia superba Using the 2-frequency Difference Method
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초록
Antarctic krill Euphausia superba are important components of the Antarctic marine ecosystem both economicallyand ecologically; to manage this species effectively, their distribution and abundance must be understood. Using theKwang Ja-Ho (3,012 tonnage), a commercial fishing vessel, we conducted acoustic surveys during April 13-24, 2016,to estimate the distribution and population size of krill around the South Shetland Islands of the Antarctic Continent,We used acoustic techniques based on the dB-difference, a method used mainly to classify of marine species. Wefound that Antarctic krill were present in numbers over 99% at six survey stations, with the exception of Station 3,where we only found Electrona carlsbergi. There was no difference in cell size due to frequency differences, but echosignals differed between species: 4.7-12.0 dB for Antarctic krill, and -4.1~0 dB for Electrona carlsbergi.
Abstract
Antarctic krill Euphausia superba are important components of the Antarctic marine ecosystem both economicallyand ecologically; to manage this species effectively, their distribution and abundance must be understood. Using theKwang Ja-Ho (3,012 tonnage), a commercial fishing vessel, we conducted acoustic surveys during April 13-24, 2016,to estimate the distribution and population size of krill around the South Shetland Islands of the Antarctic Continent,We used acoustic techniques based on the dB-difference, a method used mainly to classify of marine species. Wefound that Antarctic krill were present in numbers over 99% at six survey stations, with the exception of Station 3,where we only found Electrona carlsbergi. There was no difference in cell size due to frequency differences, but echosignals differed between species: 4.7-12.0 dB for Antarctic krill, and -4.1~0 dB for Electrona carlsbergi.
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