Journal Article

Time-based signal characteristics as predictors of fish size and species for a side-looking hydroacoustic application in a river

Debby L Burwen, Steven J Fleischman, James D Miller and Mark E Jensen

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 60, issue 3, pages 662-668
Published in print January 2003 | ISSN: 1054-3139
Published online January 2003 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/S1054-3139(03)00054-7
Time-based signal characteristics as predictors of fish size and species for a side-looking hydroacoustic application in a river

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  • Environmental Science
  • Marine and Estuarine Biology

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Side-looking, fixed-location sonar is used to estimate the abundance of migrating chinook salmon Oncorhynchus tshawytscha in the Kenai River, Alaska. For this application, echo-envelope length has previously been shown to predict fish size better than target strength. Using tethered-fish experiments we generalize these findings to other hydroacoustic descriptors based on time measurements, including range-measurement variability and fish lateral movement. These variables are all descriptors of the echo signal through time. Measurements of these attributes were correlated with daily indices of the species composition of unrestrained fish passing the sonar site. We hypothesize that time-based characteristics are superior predictors of fish size because they capitalize on, or are robust to, the factors which compromise amplitude-based measurements with side-looking sonar.

Keywords: classification; discrimination; echo length; hydroacoustic; pulse width; sonar

Journal Article.  3693 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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