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Estimating tail-beat frequency using split-beam echosounders

Handegard, Nils Olav; Pedersen, Geir; Brix, Ole
Journal article, Peer reviewed
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Åpne
handegard tailbeat postprint.pdf (469.8Kb)
Permanent lenke
http://hdl.handle.net/11250/117225
Utgivelsesdato
2009-02-04
Metadata
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Samlinger
  • The Ecosystems and Population Dynamics Programme [16]
Originalversjon
http://dx.doi.org/10.1093/icesjms/fsp003
Sammendrag
Data from a standard split-beam echosounder are used to estimate tail-beat frequency within a dense herring (Clupea harengus L.) layer. The data were collected by lowering a horizontally projecting 38 kHz split-beam transducer into a herring layer at 245-m depth. Individual targets were concatenated into tracks, and a fast Fourier transform was used to estimate the periodogram of the backscattering strengths along each track. A simple model, assumed accurate under certain conditions, was used to relate the periodogram to tail-beat frequency. The requisite conditions are discussed. Examples of accurate tail-beat estimates from single high-quality tracks, which are consistent with statistics on all tracks in the test dataset, are presented. In addition, the cross periodogram between closely spaced individuals was calculated on selected tracks to estimate the relative phase between the adjacent tracks within the school. Finally, the potential use of this method to resolve schooling behaviour, improve target-strength estimates, and even estimate fish condition, is discussed.
Beskrivelse
This is a pre-copy-editing, author-produced PDF of an article accepted for publication in ICES Journal of Marine Science following peer review. The definitive publisher-authenticated version ICES J. Mar. Sci. (2009) 66 (6): 1252-1258 is available online at: http://icesjms.oxfordjournals.org/content/66/6/1252
Utgiver
Oxford University Press
Tidsskrift
ICES Journal of Marine Science

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