Acoustic backscattering by Hawaiian lutjanid snappers. II. Broadband temporal and spectral structure 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): 2767-2774, 2003, DOI: 10.1121/1.1614257, and may be found at  http://dx.doi.org/10.1121/1.1614257.

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  • The characteristics of acoustic echoes from six species of deep-dwelling ~up to 400 m! Hawaiian Lujanid snappers were determined by backscatter measurements at the surface. A broadband linear frequency-modulated signal and a short dolphinlike sonar signal were used as the incident signals. The fish were anesthetized and attached to a monofilament net that was attached to a rotor so echoes could be collected along the roll, tilt, and lateral axes of each fish. The temporal highlight structure of broadband echoes was determined by calculating the envelope of the cross-correlation function between the incident signal and the echoes. The echo waveforms were complex with many highlights and varied with the orientation of the fish. In the tilt plane, the strongest echoes occurred when the incident signal was perpendicular to the long axis of the swimbladder. The number of highlights was the fewest at this orientation. The number of echo highlights and the length of echoes increased as the fish was tilted from this orientation. The highlight structure of the echoes resulted in the transfer function being rippled, with local maxima and minima that changed with fish size and species. The echo structures in both the time and frequency domains were generally consistent within species and were easily distinguishable between species.
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  • J. Acoust. Soc. Am. 114 (5), 2757-1766, DOI 10.1121/1.1614257
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  • I. Introduction II. Methods A. Data analysis III. Results IV. Discussion and Conclusions V. Acknowledgements
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  • description.provenance : Approved for entry into archive by Kelly Benoit-Bird(kbenoit@coas.oregonstate.edu) on 2009-09-24T17:23:27Z (GMT) No. of bitstreams: 1 JAcoustSociety2003AcousticBackscatter_II.pdf: 626688 bytes, checksum: aed685c4b9ff2e2232fab733d3bd67b2 (MD5)
  • description.provenance : Made available in DSpace on 2009-09-24T17:23:27Z (GMT). No. of bitstreams: 1 JAcoustSociety2003AcousticBackscatter_II.pdf: 626688 bytes, checksum: aed685c4b9ff2e2232fab733d3bd67b2 (MD5) Previous issue date: 2003-11
  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-09-24T17:18:57Z No. of bitstreams: 1 JAcoustSociety2003AcousticBackscatter_II.pdf: 626688 bytes, checksum: aed685c4b9ff2e2232fab733d3bd67b2 (MD5)
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  • 0001-4966

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