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dc.contributor.authorSkagen, Dankert W.
dc.date.accessioned2012-08-17T11:09:47Z
dc.date.available2012-08-17T11:09:47Z
dc.date.issued1989
dc.identifier.citationThis report is not to be cited without prior reference to the authorno_NO
dc.identifier.urihttp://hdl.handle.net/11250/104623
dc.description.abstractLength, weight and age in random samples from Norwegian catches of' mackerel from 1960 to 1985 have been reviewed. A standard growth curve was constructed by applying a modified von Bertalanffy equation to all data. The deviation from this curve is largely independent of age for adult mackerel, and may be used as a measure of the growth pattern. In the North Sea area, the length at age has increased gradually by 4-5 cm during this period, while it has been nearly stationary in the western spawning area. The condition has remained stable in this period. The mackerel caught in the North Sea is generally larger at age than the typical Western mackerel, even in the years and seasons when Western mackerel dominated in the cathes in the North Sea. The mixing of two stock components with different growth patterns also makes the use of length distributions as a measure of age distributions questionable.no_NO
dc.language.isoengno_NO
dc.publisherICESno_NO
dc.relation.ispartofseriesICES CM Documents;1989/H:21
dc.subjectmackerelno_NO
dc.subjectmakrellno_NO
dc.subjectgrowthno_NO
dc.subjectvekstno_NO
dc.subjectstock assessmentno_NO
dc.subjectbestandsberegningno_NO
dc.titleGrowth patterns in the North Sea and western mackerel in Norwegian catches 1960- 85no_NO
dc.typeWorking paperno_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921no_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452no_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923no_NO
dc.source.pagenumber22 s.no_NO


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