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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on June 29, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm094
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Acoustic backscatter by schools of adult Atlantic mackerel

Natalia Gorska1,, Rolf J. Korneliussen2 and Egil Ona2

1 Institute of Oceanology of Polish Academy of Sciences, ul. Powstanców Warszawy 55, PL–81–712 Sopot, Poland
2 Institute of Marine Research, PO Box 1870, Nordnes, N-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

Gorska, N., Korneliussen, R. J., and Ona, E. 2007. Acoustic backscatter by schools of adult Atlantic mackerel. – ICES Journal of Marine Science, 64.

The extent of acoustic backscatter by schools of adult Atlantic mackerel (Scomber scombrus) is investigated to improve biomass estimates. Previous studies involving modelled scattering from individual mackerel showed that backscattering at high frequencies is dominated by the contribution from the backbone. Accurate predictions of the scattering spectra require consideration of backscattering from the entire skeleton, including details of the bone shapes and their acoustic properties. Here, the backscattering cross-sections from mackerel flesh and backbone are estimated theoretically from 18 to 364 kHz and averaged over fish size and tilt angle, then compared with in situ measurements of volume backscattering from mackerel schools. Based on the comparisons, some gross features of the observed relative frequency response are explained, and recommendations for further studies suggested.

Keywords: backbone, fish flesh, mean backscattering cross-section, modelling, sound backscattering by mackerel

Received 3 October 2005; accepted 30 March 2007.


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