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dc.contributor.authorHuse, Ingvar
dc.contributor.authorOstrowski, Marek
dc.date.accessioned2008-08-06T07:54:31Z
dc.date.issued1998
dc.identifier.urihttp://hdl.handle.net/11250/100145
dc.description.abstractA large concentration of wintering herring was surveys continuously with acoustics over 37 hours in a fjord in Northern Norway. 16 surveys of the same area were conducted. Total abundance and statistics were computed for each survey. Distribution graphs showd a clear diel variation, with deep daytime layers and more shallow night time distribution. Acoustically measured abundance at night was 50% of the daytime values. The results are discussed in terms of behaviour induced diel variation in acoustic backscattering, and potential influence on acoustic abundance measurements.en
dc.format.extent1405891 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.relation.ispartofseriesICES CM documentsen
dc.relation.ispartofseries1998/J:18en
dc.titleVariation in acoustically measured abundance from repeated surveys of herringen
dc.typeWorking paperen
dc.subject.nsiVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920
dc.source.pagenumber8 s.


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