Journal Article

A method for evaluating the effects of biological factors on fish target strength

Elliott L Hazen and John K Horne

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 60, issue 3, pages 555-562
Published in print January 2003 | ISSN: 1054-3139
Published online January 2003 | e-ISSN: 1095-9289 | DOI: https://dx.doi.org/10.1016/S1054-3139(03)00053-5
A method for evaluating the effects of biological factors on fish target strength

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  • Environmental Science
  • Marine and Estuarine Biology

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Understanding the relationship between fish biology and target strength potentially improves the accuracy of acoustic assessments. The effects of individual biological factors (e.g., length, tilt, and depth) on backscatter amplitude have been examined, but the relative contribution of each factor has not been quantified. Dimensionless ratios, which facilitate comparison of disparate quantities, were used to evaluate the effects of individual biological factors on echo intensities. Ratios from 25 adult walleye pollock (Theragra chalcogramma) were calculated using a Kirchhoff-ray-mode, backscatter model parameterized for each fish. This comparative approach can be used to identify the influence of biological factors on backscatter intensity and is potentially a tool for improving accuracy when converting acoustic size to fish length.

Keywords: acoustics; backscatter; Boyle's law; fish behavior; swimbladder; target strength; tilt angle

Journal Article.  4190 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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