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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 2, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1106-1110; doi:10.1093/icesjms/fsp131
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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]

Multifrequency discrimination of fish and mysids

Thomas Axenrot1, Martin Ogonowski2, Alfred Sandström1 and Tomas Didrikas2

1 Institute of Freshwater Research, Swedish Board of Fisheries, Stångholmsvägen 2, 178 93 Drottningholm, Sweden
2 Department of Systems Ecology, Stockholm University, 106 91 Stockholm, Sweden

Correspondence to T. Axenrot: tel: +46 8 6990634; fax: +46 6 990650; e-mail thomas.axenrot{at}fiskeriverket.se.

Axenrot, T., Ogonowski, M., Sandström, A., and Didrikas, T. 2009. Multifrequency discrimination of fish and mysids. – ICES Journal of Marine Science, 66: 1106–1110.

The opossum shrimp (Mysis relicta) is common in many lakes in the northern parts of Eurasia and North America. The shrimp is often an important link in the foodweb for fish, either throughout life or in early life stages. Generally, quantitative measurements of mysids in large volumes of water are difficult to obtain with traditional sampling methods. In this pilot study, measurements of volume-backscattering strength (Sv) at 38, 120, and 200 kHz were used to separate backscattering from fish and mysids. Mysids were sampled with trawls. Where mysids were caught, the correlations between mysid biomass (dry weight) and mean Sv at 120 and 200 kHz were positive (r2 = 0.89 and 0.81, respectively). Where mysids were abundant, the Sv exhibited a characteristic frequency response. This was not found where mysids were scarce or absent. Therefore, areas with great abundances of mysids can be identified, and their biomasses estimated from data collected during ecosystem monitoring.

Keywords: abundance, ecosystem monitoring, multifrequency, mysids

Received 8 August 2008; accepted 17 February 2009; advance access publication 2 May 2009.


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