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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 27, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(6):1220-1234; doi:10.1093/icesjms/fsm084
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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

In situ measurements of orange roughy (Hoplostethus atlanticus) target strength

Roger F. Coombs1, and Richard Barr2

1 Innovative Solutions Limited, PO Box 22-235, Wellington, New Zealand
2 Blue Mountains Road, Whitemans Valley, Upper Hutt, New Zealand

Correspondence to R. F. Coombs: tel: +64 4479 0151; e-mail: roger.coombs{at}isl-solutions.co.nz

Coombs, R. F., and Barr, R. 2007. In situ measurements of orange roughy (Hoplostethus atlanticus) target strength. – ICES Journal of Marine Science, 64: 1220–1234.

Orange roughy (Hoplostethus atlanticus) support one of New Zealand's most valuable commercial fisheries, and its assessment poses many problems. Acoustic estimation using echo integration has become one of the main sources of biomass information, and for this an estimate of orange roughy target strength (TS) is needed. Its schooling characteristics together with patterns in the rate of change of phase vs. TS plots are used to identify ensembles of orange roughy targets from in situ TS data collected from a wide range of fishing areas off eastern New Zealand. The results suggest a TS of –49.3 dB for an orange roughy of 35 cm standard length.

Keywords: echo classification, hydroacoustics, orange roughy, target identification, target strength

Received 25 September 2006; accepted 10 April 2007; advance access publication 27 June 2007.


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