Vis enkel innførsel

dc.contributor.authorFoote, Kenneth G.
dc.contributor.authorOstrowski, Marek
dc.contributor.authorRøttingen, Ingolf
dc.contributor.authorEngås, Arill
dc.contributor.authorHansen, Kaare A.
dc.contributor.authorHauge, Kjellrun Hiis
dc.contributor.authorSkeide, Roar L.
dc.contributor.authorSlotte, Aril
dc.contributor.authorTorgersen, Øyvind
dc.date.accessioned2012-09-28T06:55:51Z
dc.date.available2012-09-28T06:55:51Z
dc.date.issued1996
dc.identifier.citationThis report is not to be cited without prior reference to the authorsno_NO
dc.identifier.urihttp://hdl.handle.net/11250/105627
dc.description.abstractStandard echo integration methodology has been applied to the stock of Norwegian spring spawning herring (Clupea harengus) wintering in the Ofotfjord-Tysfjord-Vestfjord system during late autumn 1995 and early winter 1996. The primary instruments of acoustic data collection and processing were the SIMRAD EK500/38-kHz echo sounder and the Bergen Echo Integrator. Biological sampling was effected by means of a so-called MultiSampler pelagic trawl in addition to standard pelagic trawls. Compensation was made during postprocessing for the effect of acoustic extinction. The major complication of the survey and challenge of the analysis has been stratification. This is discussed in the context of (1) mixing of immature and mature year classes, each with its own behavioural characteristics apropos of diurnal vertical migration and outwards spawning migration, (2) degree of achieved survey coverage, depending on fjord geometry, navigational hazards, available time, and fish distribution, and (3) ongoing spawning migration. Because of various uncertainties, a series of abundance estimates is presented. These are accompanied by fitted variogram models and geostatistical variance estimates.no_NO
dc.language.isoengno_NO
dc.publisherICESno_NO
dc.relation.ispartofseriesICES CM Documents;1996/H:33
dc.subjectherringno_NO
dc.subjectsildno_NO
dc.subjectacousticsno_NO
dc.subjectakustikkno_NO
dc.subjectstock assessmentno_NO
dc.subjectbestandsberegningno_NO
dc.subjectfish migrationno_NO
dc.subjectvandringerno_NO
dc.titleAcoustic abundance estimation of the stock of Norwegian spring spawning herring, winter 1995- 1996no_NO
dc.typeWorking paperno_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485no_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452no_NO
dc.source.pagenumber32 s.no_NO


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel