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J. Mar. Sci. Eng. 2016, 4(3), 43; doi:10.3390/jmse4030043

Power-Budget Equations and Calibration Factors for Fish Abundance Estimation Using Scientific Echo Sounder and Sonar Systems

1
Department of Physics and Technology, University of Bergen, P.O. Box 7803, N-5020 Bergen, Norway
2
Institute of Marine Research, P.O. Box 1870, Nordnes, N-5817 Bergen, Norway
3
Christian Michelsen Research AS, P.O. Box 6031, Postterminalen, N-5892 Bergen, Norway
*
Author to whom correspondence should be addressed.
Academic Editor: Jens Martin Hovem
Received: 29 February 2016 / Revised: 25 June 2016 / Accepted: 4 July 2016 / Published: 9 July 2016
(This article belongs to the Special Issue Underwater Acoustics and the Ocean Environment)
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Abstract

Acoustic methods used in fish abundance estimation constitute a key part of the analytic assessment that makes the basis for abundance estimation of marine resources. The methods rely on power-budget equations and calibrated systems. Different formulations of power-budget equations and calibration factors have been proposed for use in scientific echo sounder and sonar systems. There are unresolved questions and apparent inconsistencies in prior literature related to this field. A generic (instrument independent) and unifying theory is presented that attempts to explain the different power-budget and calibration factor formulations proposed and used in prior literature, and how these are mutually related. Deviations and apparent inconsistencies in this literature appear to be explained and corrected. This also includes different (instrument specific) formulations employed in important modern scientific echo sounder systems, and their relationship to the generic theory of abundance estimation. Prior literature is extended to provide more complete power-budget equations for fish abundance estimation and species identification, by accounting for echo integration, electrical termination, and the full range of electrical and acoustical echo sounder parameters. The expressions provide a consistent theoretical basis for improved understanding of conventional methods and instruments used today, also enabling improved sensitivity and error analyses, and correction possibilities. View Full-Text
Keywords: fisheries acoustics; single-target backscattering; volume backscattering; echo integration fisheries acoustics; single-target backscattering; volume backscattering; echo integration
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lunde, P.; Korneliussen, R.J. Power-Budget Equations and Calibration Factors for Fish Abundance Estimation Using Scientific Echo Sounder and Sonar Systems. J. Mar. Sci. Eng. 2016, 4, 43.

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