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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 10, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1391-1397; doi:10.1093/icesjms/fsp014
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© United States Government, Department of Interior 2009

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]

Towards a standard operating procedure for fishery acoustic surveys in the Laurentian Great Lakes, North America

Lars G. Rudstam1, Sandra L. Parker-Stetter2, Patrick J. Sullivan1 and David M. Warner3

1 Department of Natural Resources and Cornell Biological Field Station, Cornell University, Fernow Hall, Ithaca, NY 14850, USA
2 School of Aquatic and Fishery Sciences, University of Washington, PO Box 355020, Seattle, WA 98195-5020, USA
3 US Geological Survey Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, USA

Correspondence to L. G. Rudstam: tel: +1 315 633 9243; fax: +1 315 633 2358; e-mail: rudstam{at}cornell.edu

Rudstam, L. G., Parker-Stetter, S. L., Sullivan, P. J., and Warner, D. M. 2009. Towards a standard operating procedure for fishery acoustic surveys in the Laurentian Great Lakes, North America. – ICES Journal of Marine Science, 66: 1391–1397.

Acoustic surveys are conducted annually in all five of the Laurentian Great Lakes and Lake Champlain to assess forage-fish abundance. The main target species are rainbow smelt (Osmerus mordax), alewife (Alosa pseudoharengus), and several coregonine species (Coregonus spp.). The Great Lakes Fishery Commission sponsored an Acoustic Study Group from 2002 to 2006 to discuss common problems and suggest standardized methods across these lakes. The study group produced a set of recommendations, available as a Great Lakes Fishery Commission Special Publication and on the web, that use in situ target strength (TS) to scale volume backscattering. Here, we review these recommendations with special attention to four often-overlooked topics of interest to all acoustic users, namely issues associated with first, the choice of thresholds for both TS and volume-backscattering strength, second, different settings for single-echo detection algorithms for measures of in situ TS, third, those taking account of measuring in situ TS in dense fish concentrations, and finally, detection limits.

Keywords: alewife, analysis thresholds, detection limits, hydroacoustics, Laurentian Great Lakes, rainbow smelt, standard operating procedures

Received 22 July 2008; accepted 13 November 2008; advance access publication 10 February 2009.


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