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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on April 14, 2008
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsn052
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Proposals for the collection of multifrequency acoustic data

Rolf J. Korneliussen1, Noel Diner2, Egil Ona1, Laurent Berger2 and Paul G. Fernandes3

1 Institute of Marine Research, PO Box 1870 Nordnes, 5817 Bergen, Norway
2 IFREMER, BP 70 29280, Plouzane, France
3 Fisheries Research Services, Marine Laboratory Aberdeen, PO Box 101, Victoria Road, Aberdeen AB11 9DB, UK

Correspondence to R. J. Korneliussen: tel: +47 55 238500; fax: +47 55 238531; e-mail: rolf{at}imr.no

Korneliussen, R. J., Diner, N., Ona, E., Berger, L., and Fernandes, P. G. 2008. Proposals for the collection of multifrequency acoustic data. – ICES Journal of Marine Science, 65.

Acoustic surveys are used to estimate the abundance and distribution of many fish species, and have been based traditionally on data collected at a single acoustic frequency. Although it has been known for some time that the use of additional frequencies can provide information on the nature of the acoustic target, the knowledge and technology required to combine the so-called "multifrequency data" in an appropriate manner has been limited. The use of several transducers of different frequencies is now common on board research vessels and fishing vessels, so multifrequency data are often collected. In order for these data to be combined appropriately, their physical and spatial characteristics from each frequency should be as similar as possible. We detail the requirements deemed necessary to collect multifrequency data in an appropriate manner. They can be stringent and may not always be achievable, so we also consider the consequences of combining acoustic data originating in transducers with varying degrees of spatial separation and with different beam widths.

Keywords: data collection, multifrequency acoustics, species identification

Received 10 May 2007; accepted 18 January 2008.


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