Journal Article

Lidar target-strength measurements on Northeast Atlantic mackerel (<i>Scomber scombrus</i>)

Eirik Tenningen, James H. Churnside, Aril Slotte and James J. Wilson

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 4, pages 677-682
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2005.11.018
Lidar target-strength measurements on Northeast Atlantic mackerel (Scomber scombrus)

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A linearly polarized green (532 nm) laser and a digital video camera were used to determine the reflectivity (R) and lidar (LIght Detection And Ranging) target strength (TS) of live mackerel by comparison with a standard calibration target. The measured reflectivity was 0.0141 ± 0.0005 when the receiver was copolarized with the laser and 0.0092 ± 0.0004 when the receiver was cross-polarized. The corresponding TS values were −42.66 ± 0.24 dB for the copolarized channel and −44.86 ± 0.23 dB for the cross-polarized channel. The depolarization ratio (depolarized return over total return) of 0.396 is very different from earlier measurements of sardine, suggesting that depolarization might be useful for species identification.

Keywords: lidar; mackerel; polarization; reflectivity; target strength

Journal Article.  3904 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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