Controlled and in situ target strengths of the jumbo squid Dosidicus gigas and identification of potential acoustic scattering sources Public Deposited

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Copyright 2008 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in J. Acoust. Soc. Am., 123(3): 1318-1328, 2008, DOI: 10.1121/1.2832327, and may be found at  http://link.aip.org/link/?JAS/123/1318. Permalink at  http://dx.doi.org/10.1121/1.2832327.

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  • This study presents the first target strength measurements of Dosidicus gigas, a large squid that is a key predator, a significant prey, and the target of an important fishery. Target strength of live, tethered squid was related to mantle length with values standardized to the length squared of −62.0, −67.4, −67.9, and −67.6 dB at 38, 70, 120, and 200 kHz, respectively. There were relatively small differences in target strength between dorsal and anterior aspects and none between live and freshly dead squid. Potential scattering mechanisms in squid have been long debated. Here, the reproductive organs had little effect on squid target strength. These data support the hypothesis that the pen may be an important source of squid acoustic scattering. The beak, eyes, and arms, probably via the sucker rings, also play a role in acoustic scattering though their effects were small and frequency specific. An unexpected source of scattering was the cranium of the squid which provided a target strength nearly as high as that of the entire squid though the mechanism remains unclear. Our in situ measurements of the target strength of free-swimming squid support the use of the values presented here in D. gigas assessment studies.
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  • J. Acoust. Soc. Am. Volume 123, Issue 3, pp. 1318-1328 (March 2008), DOI: 10.1121/1.2832327
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  • I. Introduction II. Methods A. Acoustic system B. Mounting of live squid C. Acoustic scattering source assessments D. Acoustic measurements E. In situ measurements III. Results A. Controlled measurements B. In situ measurements IV. Discussion A. Controlled measurements B. Potential sources of scattering C. In situ measurements V. Conclusions Acknowledgements
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  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-09-24T17:20:04Z No. of bitstreams: 1 JAcoustSociety2008_JumboSquid.pdf: 699688 bytes, checksum: 532a8f3c78ff9d86def7d08879992994 (MD5)
  • description.provenance : Made available in DSpace on 2009-09-24T17:22:36Z (GMT). No. of bitstreams: 1 JAcoustSociety2008_JumboSquid.pdf: 699688 bytes, checksum: 532a8f3c78ff9d86def7d08879992994 (MD5) Previous issue date: 2008-03
  • description.provenance : Approved for entry into archive by Kelly Benoit-Bird(kbenoit@coas.oregonstate.edu) on 2009-09-24T17:22:36Z (GMT) No. of bitstreams: 1 JAcoustSociety2008_JumboSquid.pdf: 699688 bytes, checksum: 532a8f3c78ff9d86def7d08879992994 (MD5)
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  • 0001-4966

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