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Spawner quality effects on two measures of reproductive potential: have we been counting our eggs before they've hatched?

Marshall, C. Tara; Kjesbu, Olav Sigurd; Thorsen, Anders; Solemdal, Per
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Y07-1999.pdf (743.7Kb)
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http://hdl.handle.net/11250/100425
Utgivelsesdato
1999
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Sammendrag
Recent studies have found positive associations between recruitment and indices of

spawner quality (condition) for stocks exhibiting an indeterminate relationship

between recruitment and spawner biomass. This suggests that spawner biomass is

insensitive to interannual variability in condition affecting total egg production. This

hypothesis was tested for the Northeast Arctic (NA) cod stock using a simulation

approach. Because abundance of the Barents Sea capelin stock is an important

determinant of condition of NA cod, the simulations varied length-specific proportion

mature, weight, and fecundity of NA cod according to capelin biomass while holding

numbers at length constant. Total egg production and spawner biomass and their

associated errors were estimated for levels of capelin biomass which encompassed the

range observed in the Barents Sea. Increasing condition significantly increased both

total egg production and spawner biomass, however, the magnitude of increase in total

egg production was approximately double that in spawner biomass. Incorporating

hypothesized effects of condition on atresia and skipped spawning increased the

difference between total egg production and spawner biomass. Comparing sim~~lation

results for different numerical abundances and size compositions indicated that

spawning stocks dominated by smaller length classes had larger differences between

total egg production at the minimum and maximum capelin biomasses.
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ICES CM documents
1999/Y:07

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