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In Situ Inter-Standardization of Acoustics Data: An Integrated Database for Fish School Behaviour Studies

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This paper presents a method that permits to inter standardize three sources of acoustic data delivered by several different acoustic devices in order to monitor the behaviour of pelagic fish schools. An omnidirectional multi-beam sonar (32 beams/23.75 kHz), a lateral multi-beam scanning sonar (60 beams/455 kHz) onboard a research vessel and a portable echo sounder (129 kHz) onboard a small craft are used. The method is presented in two parts. The first deals with the multi-beam acoustic sonar (lateral and omnidirectional) and the second with the portable echo sounder and the omnidirectional sonar. The same schools using the portable echo sounder and the omnidirectional sonar are recorded. The same experiment with the lateral sonar and the omnidirectional one is done. The echo characteristics of the omnidirectional sonar data are compared with the two other sources of acoustic data. The preliminary "behavioural database" of fish schools is obtained by gathering the information from the three complementary devices. For each school the depth, size, two and three dimension morphology, acoustic characteristics and the swimming behaviour characteristics (swimming speed and pattern) are measured. The potential output of such database for fisheries research is discussed through preliminary results.

Document Type: Research Article

Publication date: September 1, 2002

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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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