Determining the extinction cross section of aggregating fish
Determining the extinction cross section of aggregating fish
Date
1992-04
Authors
Foote, Kenneth G.
Ona, Egil
Toresen, Reidar
Ona, Egil
Toresen, Reidar
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DOI
10.1121/1.403682
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Keywords
Sound waves
Cross sections
Extinction
Fishes
Fiords
Underwater
Acoustic monitoring
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.
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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.
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Journal of the Acoustical Society of America 91 (1992): 1983-1989