Comparison of walleye pollock target strength estimates determined from in situ measurements and calculations based on swimbladder form
Journal home page: http://scitation.aip.org/jasa/ 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. Resp...
| Published in: | The Journal of the Acoustical Society of America |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1988
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11250/108007 https://doi.org/10.1121/1.396190 |
| Summary: | Journal home page: http://scitation.aip.org/jasa/ 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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