Vis enkel innførsel

dc.contributor.authorHelle, Kristin
dc.contributor.authorBogstad, Bjarte
dc.contributor.authorMarshall, C. Tara
dc.contributor.authorMichalsen, Kathrine
dc.contributor.authorOttersen, Geir
dc.contributor.authorPennington, Michael
dc.date.accessioned2007-07-19T07:56:33Z
dc.date.issued1999
dc.identifier.urihttp://hdl.handle.net/11250/100435
dc.description.abstractIndices of the abundance of Northeast Arctic cod (Gadus morhua L.) for various life stages were compared in order to determine the earliest stage at .which year-class strength is established. The indices considered are: VPA estimates of spawning stock biomass; an egg abundance index; an early juvenile (approximately three-months old) abundance index; 0-group (age four to five months) abundance indices; bottom trawl and acoustic survey abundance indices for one, two and three- year-old cod and VPA estimates of the abundance of three-year-old cod. Based on a regression analysis, the relative abundance of early juvenile cod was the first life stage that was correlated with their relative'abundance as three year olds. Since the cokelation between the estimates of spawning stock biomass or total egg production and the relative abundance of three-year-old cod was weak, it is concluded that considerable yearly variation in mortality occurs before cod reach the early juvenile stage.en
dc.format.extent1618404 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherICESen
dc.relation.ispartofseriesICES CM documentsen
dc.relation.ispartofseries1999/Y:20en
dc.subjectarctic coden
dc.subjectarktisk torsken
dc.subjectrecruitmenten
dc.subjectstock developmenten
dc.subjectbestandsutvikling
dc.subjectrekruttering
dc.titleAn evaluation of recruitment indices for Northeast Arctic cod (Gadus morhua L.)en
dc.typeWorking paperen
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
dc.source.pagenumber17 s.en


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel