Journal Article

Acoustic backscatter by schools of adult Atlantic mackerel

Natalia Gorska, Rolf J. Korneliussen and Egil Ona

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 6, pages 1145-1151
Published in print September 2007 | ISSN: 1054-3139
Published online June 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm094
Acoustic backscatter by schools of adult Atlantic mackerel

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Gorska, N., Korneliussen, R. J., and Ona, E. 2007. Acoustic backscatter by schools of adult Atlantic mackerel. – ICES Journal of Marine Science, 64: 1145–1151.

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

Journal Article.  4490 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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