Journal Article

Applying an alternative method of echo-integration

Magnar Aksland

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 8, pages 1438-1452
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI: https://dx.doi.org/10.1016/j.icesjms.2006.03.027
Applying an alternative method of echo-integration

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Estimators of mean Echo Value Constant (the ratio between echo abundance and the number of fish) in an alternative echo-integrating method were tried with the SIMRAD EK 60 split-beam echosounder. The mean fish-density estimates of NE Arctic cod were compared with corresponding estimates by the classical echo-integration method; the two methods gave similar results. The alternative method uses integrated single-fish echoes, and a new algorithm to extract and integrate single-target echoes is introduced and used. This algorithm uses echo shape and angle stability, not echo amplitude, to test for the presence of single-target echoes. Apparent single-target echoes with a dynamic range of 60 dB in integrated echo intensity were extracted.

Keywords: echo-integration; estimation of fish abundance; fisheries acoustics; in situ method; NE Arctic cod

Journal Article.  9774 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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