| Issue |
Aquat. Living Resour.
Volume 16, Number 3, July 2003
Acoustics in Fisheries and Aquatic Ecology. Part 2
|
|
|---|---|---|
| Page(s) | 293 - 298 | |
| DOI | https://doi.org/10.1016/S0990-7440(03)00013-5 | |
| Published online | 15 July 2003 | |
Split-beam target tracking can be used to study the swimming behaviour of deep-living plankton in situ
Department of Biology, University of Oslo, P.O. Box 1064, Blindern 0316, Oslo, Norway
Corresponding author: t.a.klevjer@bio.uio.no
Accepted: 24 January 2003
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.
Key words: Behaviour / Invertebrate / Swimming / Speed / Target tracking
© Elsevier, IRD, Inra, Ifremer, Cemagref, 2003
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