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ICES Journal of Marine Science: Journal du Conseil 2006 63(8):1438-1452; doi:10.1016/j.icesjms.2006.03.027
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© 2006 International Council for the Exploration of the Sea

Applying an alternative method of echo-integration

Magnar Aksland*

Department of Biology, University of Bergen PO Box 7800, N 5020 Bergen, Norway

*Correspondence to M. Aksland: tel: +47 55584479; fax: +47 55584450. e-mail: magnar.aksland{at}bio.uib.no.

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

Received 15 February 2005; accepted 6 March 2006.


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