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Title: 体積後方散乱強度の周波数差を利用した北海道噴火湾周辺におけるオキアミ類とカイアシ類の識別
Other Titles: Acoustic identification of krill and copepods using frequency differences of volume backscattering strength around Funka Bay, Hokkaido, Japan
Authors: 金, 銀好1 Browse this author
向井, 徹2 Browse this author →KAKEN DB
飯田, 浩二3 Browse this author →KAKEN DB
Authors(alt): Kim, Eunho1
Mukai, Tohru2
Iida, Kohji3
Keywords: オキアミ類
Issue Date: 15-Jul-2016
Publisher: 日本水産学会
Journal Title: 日本水産学会誌
Volume: 82
Issue: 4
Start Page: 587
End Page: 600
Publisher DOI: 10.2331/suisan.15-00039
Abstract: 北海道噴火湾周辺海域において,周波数 38, 120, 200 kHz の計量魚群探知機を用いて音響散乱層の特徴を調べ,その構成生物であるオキアミ類とカイアシ類の識別方法を検討した。生物の確認は,直径 80 cm のリングネットによる垂直曳網で行った。オキアミ類とカイアシ類は,周波数 38 kHz よりも 120 kHz と 200 kHz でより強い音響散乱を示し,さらにこれら 2 周波数の SV 差は,オキアミ類で−1.5~1.3 dB,カイアシ類で 2.2-3.7 dB となり,この SV 差を利用して両種を識別する可能性が示された。
In and around Funka Bay in southwest Hokkaido, Japan, krill and copepods are the dominant species of zooplankton. In this area, they are important prey for walleye pollock Gadus chalcogrammus and other marine animals. In this study, we examined the possibility of identifying krill and copepods based on differences in volume backscattering strength at different frequencies. Acoustic surveys were conducted in and around Funka Bay in March 2012 aboard the T/S Ushio-maru using a Simrad EK60 quantitative echo sounder. The acoustic data were collected at 38, 120 and 200 kHz. Biological samples were collected by a ring net with vertical towing. To identify the krill and copepods, differences in volume backscattering strength at three frequencies were examined. Krill and copepods showed stronger response at 120 and 200 kHz than at 38 kHz. The results showed that the differences in volume backscattering strength between 120 and 200 kHz (ΔSV200-120 kHz) were −1.5 to 1.3 dB for krill and 2.2-3.7 dB for copepods. Based on these differences between frequencies, we were able to identify krill and copepods.
Rights: © 2016 公益社団法人日本水産学会
© 2016 The Japanese Society of Fisheries Science
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 向井 徹

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