Journal Article

<i>In situ</i> measurements of orange roughy (<i>Hoplostethus atlanticus</i>) target strength

Roger F. Coombs and Richard Barr

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 6, pages 1220-1234
Published in print September 2007 | ISSN: 1054-3139
Published online June 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm084
In situ measurements of orange roughy (Hoplostethus atlanticus) target strength

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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

Journal Article.  8721 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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