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Comparison of walleye pollock target strength estimates determined from in situ measurements and calculations based on swimbladder form

Foote, Kenneth G.; Traynor, Jimmie J.
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/108007
Date
1988
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Original version
http://dx.doi.org/10.1121/1.396190
Abstract
The target strength of walleye pollock (Theragra chalcogramma) at 38 kHz has been determined in each of two ways: (1) in situ measurement with dual-beam and split-beam echo sounders, and (2) theoretical calculation based on the swimbladder form. Respective probability density functions of target strength are compared. The several estimates of mean target strength (T-bar S-bar) determine the relation T-bar S-bar =20 log l–66.0, where l is the fish fork length in centimeters.
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Journal home page: http://scitation.aip.org/jasa/
Journal
The Journal of the Acoustical Society of America

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