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Physiological factors causing natural variations in acoustic target strength of fish

Published online by Cambridge University Press:  11 May 2009

E. Ona
E. Ona
Affiliation:
Institute of Marine Research, PO Box 1870, N-5024 Bergen, Norway
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Abstract

The swimbladder is recognized as responsible for a major part of the acoustic backscattering from fish. In most fishes it has the function of a buoyancy regulator but in others its main function is rather unclear. Based on methods for exact mapping of the swimbladder shape, observations of deviations from normal appearance and shape are discussed in relation to possible effects on target strength. Evidence for both periodic variations, as from uncompensated vertical migrations, and seasonal variations, caused by the fat cycle and gonad development, are presented.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 70 , Issue 1 , February 1990 , pp. 107 - 127
Copyright
Copyright © Marine Biological Association of the United Kingdom 1990

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