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dc.contributor.authorHandegard, Nils Olav
dc.contributor.authorPedersen, Geir
dc.contributor.authorBrix, Ole
dc.date.accessioned2010-11-26T11:40:50Z
dc.date.available2010-11-26T11:40:50Z
dc.date.issued2009-02-04
dc.identifier.issn1054-3139
dc.identifier.urihttp://hdl.handle.net/11250/108533
dc.descriptionThis 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/66/6/1252en_US
dc.description.abstractData 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.en_US
dc.language.isoengen_US
dc.publisherOxford University Pressen_US
dc.subjectecho sounderen_US
dc.subjectekkolodden_US
dc.subjecttaggingen_US
dc.subjectmerkingen_US
dc.subjectherringen_US
dc.subjectsilden_US
dc.titleEstimating tail-beat frequency using split-beam echosoundersen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924en_US
dc.source.pagenumber1252-1258en_US
dc.source.volume66
dc.source.journalICES Journal of Marine Science
dc.source.issue6
dc.identifier.doihttp://dx.doi.org/10.1093/icesjms/fsp003


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