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Acoustic Properties of Fish as Related to External Conditions

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It can be expected that changes in different physical parameters of the environment alter the target strength of fish and zooplankton in seas and lakes. Density and sound speed of fish tissue are so close to that of water that their values and, as a consequence, the value of target strength are very sensitive to any changes in the temperature and salinity of the medium. If we assume that fish density does not depend on the environmental parameters, then we can calculate separately the target stregth (TS) of fish tissue and the TS of swimbladder in various types of water. Light is an important factor controlling the diurnal migration of water organisms, the depth of their occurrence, and, to some extent, their behaviour. It also influences the value of target strength. This paper provides speculations on the effect of the variability of some physical parameters of the environment on the acoustical properties of fish and presents results from a comparison of similar fish in different waters.
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Document Type: Research Article

Publication date: 2002-09-01

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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