Importance of the swimbladder in acoustic scattering by fish: A comparison of gadoid and mackerel target strengths
作者:
Kenneth G. Foote,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1980)
卷期:
Volume 67,
issue 6
页码: 2084-2089
ISSN:0001-4966
年代: 1980
DOI:10.1121/1.384452
出版商: Acoustical Society of America
数据来源: AIP
摘要:
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.
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