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dc.contributor.authorHeino, Mikko
dc.contributor.authorBoukal, David S.
dc.contributor.authorFalkenhaug, Tone
dc.contributor.authorPiatkowski, Uwe
dc.contributor.authorPorteiro, Filipe M.
dc.contributor.authorSutton, Tracey T.
dc.date.accessioned2012-02-07T08:30:55Z
dc.date.available2012-02-07T08:30:55Z
dc.date.issued2008
dc.identifier.citationThis report is not to be quoted without prior consultation with the General Secretary.no_NO
dc.identifier.urihttp://hdl.handle.net/11250/102688
dc.description.abstractHere we present a new technique to study life history variation when only length distributions of populations are known. Shape of length distribution in a population is to a significant extent determined by the degree to which an average individual approaches its asymptotic maximum size. Statistically, the shape of a length can be characterised by its skewness, measuring the degree of symmetry in the distribution. Positive skew (long right tail) in a length distribution suggests that relative few individuals survive long enough to approach asymptotic size in a population, whereas the opposite is true for negative skew (long left tail). With a simple model of age-size dynamics in a population showing indeterminate growth, we show that skewness is strongly correlated with the ratio between mortality rate and the growth parameter k in the von Bertalanffy growth model; this ratio is a dimensionless number that is one of Beverton’s ‘life history statics’. We demonstrate the new technique with data from deep-pelagic fishes collected during the 2004 Mar-Eco expedition along the northern Mid- Atlantic Ridge. Keywords: Dimensionless numbers, growth trajectory, life-history invariants, mortalityno_NO
dc.language.isoengno_NO
dc.publisherICESno_NO
dc.relation.ispartofseriesICES CM documents;2008/F:13
dc.subjectgrowthno_NO
dc.subjectvekstno_NO
dc.subjectmortalityno_NO
dc.subjectdødelighetno_NO
dc.titleSize structure, age-size dynamics and life history variationno_NO
dc.typeWorking paperno_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923no_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924no_NO
dc.source.pagenumber7 s.no_NO


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