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ICES Journal of Marine Science: Journal du Conseil 2006 63(5):952-955; doi:10.1016/j.icesjms.2005.12.011
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© 2006 International Council for the Exploration of the Sea

Progress in determining southern blue whiting (Micromesistius australis) target strength: results of swimbladder modelling

Adam J. Dunford* and Gavin J. Macaulay

National Institute of Water and Atmospheric Research Private Bag 14-901, Kilbirnie, Wellington, New Zealand

*Correspondence to A. J. Dunford: tel: +64 4 386 0300; fax: +64 4 386 0574. e-mail: a.dunford{at}niwa.cri.nz.

Southern blue whiting target strength (TS) results from Kirchhoff modelling of swimbladder casts scanned using a hand-held 3D laser scanner are presented. The data are compared with the relationship between TS and fish length used for New Zealand stock-assessment surveys; TS = 21.8 log10(fork length) – 72.8, at 38 kHz. This relationship has its origins in the relationship used for blue whiting (Micromesistius poutassou) in the northern hemisphere, and is based on measurements on juvenile cod (Gadus morhua). The results indicate that the blue whiting relationship is not appropriate for southern blue whiting, and suggest a much steeper slope, with TS = 38 log10(fork length) – 97, at 38 kHz. Sensitivity analyses indicate that further investigations of swimbladder tilt-angle distribution and swimbladder volume are unlikely to provide evidence to support the use of the blue whiting relationship for southern blue whiting.

Keywords: acoustic target strength, Kirchhoff modelling, southern blue whiting, swimbladder

Received 25 May 2005; accepted 3 December 2005.


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