Acoustic backscattering by Hawaiian lutjanid snappers. I. Target strength and swimbladder characteristics Public Deposited

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Copyright 2003 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., 114(5): 2757-2766, 2003, DOI: 10.1121/1.1614256, and may be found at  http://link.aip.org/link/?JAS/114/2757. Permalink at  http://dx.doi.org/10.1121/1.1614256.

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  • The target strengths and swimbladder morphology of six snapper species were investigated using broadband sonar, x rays, and swimbladder casts. Backscatter data were obtained using a frequency-modulated sweep ~60–200 kHz! and a broadband, dolphinlike click ~peak frequency 120 kHz! from live fish, mounted and rotated around each of their three axes. X rays revealed species-specific differences in the shape, size, and orientation of the swimbladders. The angle between the fish’s dorsal aspect and the major axis of its swimbladder ranged from 3° to 12° and was consistent between individuals within a species. This angle had a one-to-one relationship with the angle at which the maximum dorsal aspect target strength was measured (r250.93), regardless of species. Maximum dorsal aspect target strength was correlated with length within species. However, the swimbladder modeled as an air-filled prolate spheroid with axes measured from the x rays of the swimbladder predicted maximum target strength significantly better than models based on fish length or swimbladder volume. For both the dorsal and lateral aspects, the prolate spheroid model’s predictions were not significantly different from the measured target strengths ~observed power .0.75! and were within 3 dB of the measured values. This model predicts the target strengths of all species equally well, unlike those based on length.
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  • J. Acoust. Soc. Am. Volume 114, Issue 5, pp. 2757-2766 (November 2003), DOI: 10.1121/1.1614256
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  • I. Introduction II. Methods A. Backscatter B. Swimbladders C. Data analysis D. Results III. Swimbladders A. Target Strength B. Models C. Discussion IV. Acknowledgements
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  • description.provenance : Approved for entry into archive by Kelly Benoit-Bird(kbenoit@coas.oregonstate.edu) on 2009-09-24T17:20:50Z (GMT) No. of bitstreams: 1 JAcoustSociety2003AcousticBackscatter_I.pdf: 564224 bytes, checksum: 510a24d1ec061737ade3408c92706ce2 (MD5)
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  • description.provenance : Made available in DSpace on 2009-09-24T17:20:50Z (GMT). No. of bitstreams: 1 JAcoustSociety2003AcousticBackscatter_I.pdf: 564224 bytes, checksum: 510a24d1ec061737ade3408c92706ce2 (MD5) Previous issue date: 2003-11
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  • 0001-4966

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