Analysis and implementation of hydroacoustic methods for estimation of high densities of fish in sea pens

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Authors

  • A. STEPNOWSKI Technical University of Gdańsk, Department of Electronics, Poland

Abstract

The paper presents the feasibility study of different acoustic methods with reference to system design, capable of estimating high density of fish, e.g. in aquaculture facilities. The velocity, attenuation and backscattering measurement methods are critically examined. The new, recursive echo integration method is introduced, which accounts for attenuation loss by dense collections of fish. The proposed implementation of this estimation technique employs the modified design of a dual-beam sonar-system ECOLOG II. The system provides the real-time absolute estimates of fish density in sea pens.

References

[1] A. LOVIK, Biomass estimation in aquaculture facilities, Automation and Data Processing in Aquaculture, Trondheim, Norway, 1986, pp. 171-175.

[2] J. BURCZYŃSKL, R.L. JOHNSON, W.B. KIRCHNER, Acoustic estimation of high densities of fish in sea pens, International Symposium on Fisheries Acoustics, June 22-26, 1987, Seattle, Wa, USA.

[3] R. S. MITCHELL, A. STEPNOWSKL, J. DROBNIK, D. R. GREEN, Real time signal processing techniques in a dual beam sonar system for fish stock assessment, International Symposium on Fisheries Acoustics, June 22-26, 1987, Seattle, USA, published in Archives of Acoustics 13, 1-2, 1988.