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    Importance of the swimbladder in acoustic scattering by fish : a comparison of gadoid and mackerel target strengths

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    JAS002084.pdf (635.0Kb)
    Date
    1980-06
    Author
    Foote, Kenneth G.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5660
    As published
    https://doi.org/10.1121/1.384452
    DOI
    10.1121/1.384452
    Abstract
    Previous determinations of the swimbladder contribution to the fish backscattering cross section have been hindered by ignorance of the acoustic boundary conditions at the swimbladder wall. The present study circumvents this problem by direct comparison of target strengths of three gadoid species and mackerel — anatomically comparable fusiform fish which respectively possess and lack a swimbladder. The relative swimbladder contribution to both maximum and averaged dorsal aspect backscattering cross sections is shown to be approximately 90% to 95%, which is higher than most other estimates. The new results were established for fish of 29‐ to 42‐cm length and acoustic frequencies of 38 and 120 kHz.
    Description
    Author Posting. © Acoustical Society of America, 1980. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 67 (1980): 2084-2089, doi:10.1121/1.384452.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 67 (1980): 2084-2089
     

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