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dc.contributor.authorMarshall, C. Tara
dc.contributor.authorNeedle, Coby L.
dc.contributor.authorThorsen, Anders
dc.contributor.authorKjesbu, Olav Sigurd
dc.contributor.authorYaragina, Natalia A.
dc.date.accessioned2007-06-05T11:13:15Z
dc.date.issued2006
dc.identifier.issn0706-652X
dc.identifier.urihttp://hdl.handle.net/11250/108508
dc.description.abstractStock–recruit relationships that use spawning stock biomass (SSB) to represent reproductive potential assume that the proportion of SSB composed of females and the relative fecundity (number of eggs produced per unit mass) are both constant over time. To test these two assumptions, female-only spawner biomass (FSB) and total egg production (TEP) were estimated for the Northeast Arctic stock of Atlantic cod (Gadus morhua) over a 56-year time period. The proportion of females (FSB/SSB) varied between 24% and 68%, and the variation was systematic with length such that SSB became more female-biased as the mean length of spawners increased. Relative fecundity of the stock (TEP/SSB) varied between 115 and 355 eggs·g–1 and was significantly, positively correlated with mean length of spawners. Both FSB and TEP gave a different interpretation of the recruitment response to reductions in stock size (overcompensatory) compared with that obtained using SSB (either compensatory or depensatory). There was no difference between SSB and FSB in the assessment of stock status; however, in recent years (1980–2001) TEP fell below the threshold level at which recruitment becomes impaired more frequently than did SSB. This suggests that using SSB as a measure of stock reproductive potential could lead to overly optimistic assessments of stock status.en
dc.format.extent892204 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.subjectcoden
dc.subjectfish stocksen
dc.subjectpopulation dynamicsen
dc.subjectegg productionen
dc.titleSystematic bias in estimates of reproductive potential of an Atlantic cod (Gadus morhua) stock: implications for stock–recruit theory and managementen
dc.typeJournal articleen
dc.typePeer reviewed
dc.source.pagenumber980-994en
dc.source.volume63en
dc.source.journalCanadian Journal of Fisheries and Aquatic Sciencesen
dc.source.issue5
dc.identifier.doihttp://dx.doi.org/10.1139/F05-270


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