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Categorising salmon migration behaviour using characteristics of split-beam acoustic data

Published online by Cambridge University Press:  27 October 2007

George Cronkite ,
Tim Mulligan ,
John Holmes  and
Hermann Enzenhofer
George Cronkite
Affiliation:
Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, BC, Canada V9T 6N7
Tim Mulligan
Affiliation:
3876 Yellow Point Road, Ladysmith, BC, Canada V9G 1E9
John Holmes
Affiliation:
Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, BC, Canada V9T 6N7
Hermann Enzenhofer
Affiliation:
Fisheries and Oceans Canada, Cultus Lake Salmon Research Laboratory, 4222 Columbia Valley Highway, Cultus Lake, BC, Canada V2R 5B6
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Abstract

Milling behaviour is problematic when using hydroacoustics to estimate the number of migrating fish in rivers. Milling behaviour was observed for adult sockeye salmon migrating upstream in the Wannock River, to their spawning grounds in the tributaries of Owikeno Lake in the central coast area of British Columbia, Canada. We classified the acoustic salmon tracks to separate the milling fish from the actively migrating fish in an attempt to obtain an estimate of sockeye salmon flux as they migrate to their spawning grounds. We used discriminant function analysis and found that three variables measured on each track were sufficient for the classification of the acoustic tracks into milling and non-milling categories with an approximate classification accuracy of 98%. The method we present can also be used to separate tracks of targets of interest from noise or debris tracks that occur in the acoustic data, if discrete track characteristics are ascertained.

Keywords

Split-beamAcoustic noiseTrack characteristicsDiscriminant function
Type
Research Article
Information
Aquatic Living Resources , Volume 20 , Issue 3 , July 2007 , pp. 205 - 212
Copyright
© EDP Sciences, IFREMER, IRD, 2007

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