Measurements of density contrast and sound-speed contrast for target strength estimation of Neocalanus copepods (Neocalanus cristatus and Neocalanus plumchrus) in the North Pacific Ocean

Matsukura, Ryuichi; Yasuma, Hiroki; Murase, Hiroto; Yonezaki, Shiroh; Funamoto, Tetsuichiro; Honda, Satoshi; Miyashita, Kazushi

Measurements of density contrast and sound-speed contrast for target strength estimation of Neocalanus copepods (Neocalanus cristatus and Neocalanus plumchrus) in the North Pacific Ocean

Matsukura, Ryuichi; Yasuma, Hiroki; Murase, Hiroto et al.

Fisheries Science, 2009, 75(6), 1377-1387

Permalink : https://hdl.handle.net/2115/40066

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アクセス権	open access
URI	https://hdl.handle.net/2115/40066
タイトル	Measurements of density contrast and sound-speed contrast for target strength estimation of Neocalanus copepods (Neocalanus cristatus and Neocalanus plumchrus) in the North Pacific Ocean
タイトル	北太平洋におけるNeocalanus属カイアシ類（N. cristatusおよびN. plumchrus）の理論ターゲットストレングス推定に必要な密度比, 音速比の測定
著者	Matsukura, Ryuichi ; Yasuma, Hiroki ; Murase, Hiroto ; Yonezaki, Shiroh ; Funamoto, Tetsuichiro ; Honda, Satoshi ; Miyashita, Kazushi
著者名 Matsukura, Ryuichi 松倉, 隆一
著者名 Yasuma, Hiroki 安間, 洋樹
著者名 Murase, Hiroto 村瀬, 弘人
著者名 Yonezaki, Shiroh 米崎, 史朗
著者名 Funamoto, Tetsuichiro 船本, 鉄一郎
著者名 Honda, Satoshi 本田, 聡
e-Rad_Researcher 70301877 著者名 Miyashita, Kazushi 宮下, 和士
言語	英語
キーワード	Copepod
	Density contrast
	Neocalanus cristatus
	Neocalanus plumchrus
	Signal-to-noise ratio
	Sound-speed contrast
	Target strength
発行日	2009-11
出版者	Springer Japan
収録物名	Fisheries Science
巻(号)	75(6)
ページ	1377-1387
抄録	The mass density and sound-speed contrasts against surrounding seawater (g and h, respectively) of Neocalanus copepods (N. cristatus and N. plumchrus) were measured in 2006 and 2007 to compute the theoretical target strength (TS). The values of g ranged from 0.997 - 1.009 in N. cristatus and from 0.995 - 1.009 in N. plumchrus. There were no correlations in prosome length (PL) and g. The values of h ranged from 1.006 - 1.021 in N. cristatus and 1.013 - 1.025 in N. plumchrus and varied by changes in temperature. TS were estimated by theoretical sound scattering model with the values of g and h that computed by temperature, salinity, and depth where the specimens were collected. Regressions of the tilt averaged TS vs. PL were obtained at 38, 120, and 200 kHz. The averaged TS of N. cristatus and N. plumchrus at 120 kHz, which is widely used as a high frequency, were ranged from -110.0 to -103.1 dB and from -121.4 to -109.7 dB. The higher the frequency was, the higher the value of averaged TS. The differences of TS at 120 and 38 kHz varied from 14.8 to 16.4 dB in N. cristatus, from 17.9 to 18.7 dB in N. plumchrus. The differences of TS at 200 and 120 kHz varied from 2.9 to 5.5 dB in N. cristatus, from 5.3 to 6.5 dB in N. plumchrus.
抄録	Neocalanus属カイアシ類の理論ターゲットストレングス（TS）を推定するため，海水との密度比g, 音速比hを測定した。N. cristatusとN. plumchrusのgの範囲は0.997～1.009, 0.995～1.009で体長との相関はみられなかった。一方hは1.006～1.021, 1.013～1.025の範囲で水温による変化がみられた。採集深度における水温, 塩分, 深度から計算したg, hを用い, DWBAモデルにより周波数38, 120, 200kHzにおける理論TSと体長の回帰式を得た。
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	© 2009 公益社団法人日本水産学会
	© 2009 The Japanese Society of Fisheries Science
	The final publication is available at www.springerlink.com
PISSN	0919-9268
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s12562-009-0172-3