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    Determining the extinction cross section of aggregating fish

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    JAS001983.pdf (1.077Mb)
    Date
    1992-04
    Author
    Foote, Kenneth G.  Concept link
    Ona, Egil  Concept link
    Toresen, Reidar  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5644
    As published
    https://doi.org/10.1121/1.403682
    DOI
    10.1121/1.403682
    Keyword
     Sound waves; Cross sections; Extinction; Fishes; Fiords; Underwater; Acoustic monitoring 
    Abstract
    When fish are aggregated over a flat bottom, and fish and bottom echoes can be distinguished, it is possible to determine the fish extinction cross section by a simple application of the echo integration method. The theory for this is developed. Measurements at 38 kHz are presented for aggregations of the same 1983‐year class of herring over flat‐bottomed fjord areas in 1988, 1990, and 1991. The ratio of extinction and backscattering cross sections is found to lie in the approximate range from 1.2–2.3, depending on fish size and time of day.
    Description
    Author Posting. © Acoustical Society of America, 1992. 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 91 (1992): 1983-1989, doi:10.1121/1.403682.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 91 (1992): 1983-1989
     

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