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Density and sound-speed contrasts, and target strength of Japanese sandeel Ammodytes personatus

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Title: Density and sound-speed contrasts, and target strength of Japanese sandeel Ammodytes personatus
Authors: Yasuma, Hiroki Browse this author
Nakagawa, Ryo Browse this author
Yamakawa, Takashi Browse this author
Miyashita, Kazushi Browse this author →KAKEN DB
Aoki, Ichiro Browse this author
Keywords: Ammodytes personatus
Density contrast
Japanese sandeel
Sound-speed contrast
Target strength
Theoretical scattering model
Issue Date: May-2009
Publisher: Springer Japan
Journal Title: Fisheries Science
Volume: 75
Issue: 3
Start Page: 545
End Page: 552
Publisher DOI: 10.1007/s12562-009-0091-3
Abstract: Sound-speed and density contrasts (h and g, respectively), important acoustic material properties, of Japanese sandeel Ammodytes personatus were measured to estimate theoretical target strength (TS). The measured sound-speed contrast of adult fish varied between 1.016 and 1.023 (mean, 1.020), which showed temperature dependence. The measured density contrast differed significantly between juvenile and adult. The density contrast of juvenile varied between 1.017 and 1.024 (1.021), and that of adult varied between 1.026 and 1.038 (1.032). Using these results, TS at 38 and 120 kHz in the fishing season were estimated by an empirical sound scattering model. TS of an individual fish varied significantly with change of tilt angle. TS of near-dorsal aspect (TSmax) and tilt-averaged TS (TSave) differed up to 7 dB. At both frequencies, two different TSave-length relationships (TSave = a log L + b) were obtained for adult and juvenile. The coefficients of log L of adult were close to 20, suggesting that backscattering strength was proportional to the square of body length. These values were larger in juvenile (34.0 at 120 kHz, 56.5 at 38 kHz), suggesting that backscattering strength varied drastically with the cube or fifth power of body length.
Rights: © 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
Type: article (author version)
URI: http://hdl.handle.net/2115/38598
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 安間 洋樹

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