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ICES Journal of Marine Science: Journal du Conseil 2005 62(5):984-995; doi:10.1016/j.icesjms.2005.03.010
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© 2005 International Council for the Exploration of the Sea

Acoustic backscattering by Atlantic mackerel as being representative of fish that lack a swimbladder. Backscattering by individual fish

Natalia Gorskaa,*, Egil Onab and Rolf Korneliussenb

a Institute of Oceanology of Polish Academy of Sciences ul. Powstanców Warszawy 55, PL-81-712 Sopot, Poland
b Institute of Marine Research PO Box 1870, 5817 Bergen, Norway

*Correspondence to N. Gorska: tel: +48 58 551 72 81; fax: +48 58 551 21 30. e-mail: gorska{at}iopan.gda.pl.

Developing acoustic methods for the identification of fish remains a long-term objective of fisheries acoustics. The accuracy of abundance estimation may be increased when the acoustic-scattering characteristics of the fish are known, including their expected variability and uncertainty. The modelling approach is valuable during the process of interpreting multi-frequency echograms. This paper attempts to improve the understanding of sound backscattering of fish without a swimbladder, here represented by Atlantic mackerel (Scomber scombrus). Our approach includes results from modelling as well as comparisons with field data. There will be two papers. The first is a study of the non-averaged backscattering characteristics. This initial analysis is important for the understanding of the averaged backscattering cross-section, which will be considered in the second paper. In that paper the relative importance of bones in acoustic backscattering at higher frequencies will be verified.

Keywords: backbone, fish flesh, modelling, sound backscattering by mackerel

Received 30 May 2004; accepted 20 March 2005.


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