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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on March 4, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1225-1232; doi:10.1093/icesjms/fsp024
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

Methods and results of in situ target-strength measurements of Atlantic cod (Gadus morhua) during combined trawl-acoustic surveys

Viacheslav A. Ermolchev

Laboratory of Fisheries Hydroacoustics and Underwater Technologies, Polar Research Institute of Marine Fisheries and Oceanography (PINRO), 6 Knipovich Str., 183763 Murmansk, Russia

tel: +7 8152 473461; fax: +7 8152 473331; e-mail: eva{at}pinro.ru

Ermolchev, V. A., 2009. Methods and results of in situ target-strength measurements of Atlantic cod (Gadus morhua) during combined trawl-acoustic surveys. – ICES Journal of Marine Science, 66: 1225–1232.

This paper presents methods for collecting acoustic and biological data, including in situ target-strength (TS) estimates of fish, with results presented for Atlantic cod (Gadus morhua) obtained from combined trawl-acoustic surveys. These include fish in the small, average, and maximum length classes, within the range 5–136 cm (total fish length, LT). The investigations were done using Simrad EK500/EK60 echosounders with split-beam transducers and special post-processing software. Based on an analysis of data collected in the Barents Sea during 1998–2007, a relationship TS = 25.2 log10(LT) – 74.8 was obtained for Atlantic cod at 38 kHz, with TS in dB and LT in centimetres. Seasonally, and for depths between 50 and 500 m, the variability in cod TS was 3.1 dB, decreasing with depth. The largest day–night difference in mean TS was in August–September, with changes as large as 1.0–1.7 dB. In the other seasons, the day–night difference was <1.0 dB.

Keywords: length classes, target strength, trawl-acoustic surveys

Received 11 July 2008; accepted 22 November 2008; advance access publication 4 March 2009.


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