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Split-beam target tracking can be used to study the swimming behaviour of deep-living plankton in situ

Published online by Cambridge University Press:  15 July 2003

Thor A. Klevjer  and
Stein Kaartvedt
Thor A. Klevjer*
Affiliation:
Department of Biology, University of Oslo, P.O. Box 1064, Blindern 0316, Oslo, Norway
Stein Kaartvedt
Affiliation:
Department of Biology, University of Oslo, P.O. Box 1064, Blindern 0316, Oslo, Norway
*
[email protected]
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Abstract

A scattering layer consisting mainly of krill (Meganyctiphanes norvegica) was studied with a submersible transducer, to assess the behaviour of individual organisms in situ by means of split-beam target tracking. Individuals were resolved and tracked, but a rapid increase in average swimming speeds with depth suggested that inaccuracies in the angular estimates affected the estimates. Attempts were made to smooth the tracks during post-processing. Smoothed speeds suggested that most (>78%) invertebrates swam at speeds below 12 cm s–1 (mode ~4 cm s–1), with components of speed larger in the horizontal plane than in the vertical.

Keywords

BehaviourInvertebrateSwimmingSpeedTarget tracking
Type
Research Article
Information
Aquatic Living Resources , Volume 16 , Issue 3: Acoustics in Fisheries and Aquatic Ecology. Part 2 , July 2003 , pp. 293 - 298
Copyright
© Elsevier, IRD, Inra, Ifremer, Cemagref, 2003

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