Spawner Quality Effects On Two Measures Of Reproductive Potential: Have We Been Counting Our Eggs Before They've Hatched? ...

• Main Authors: Marshall, C. Tara, Kjesbu, Olav S., Thorsen, Anders, Solemdal, Per
• Format: Conference Object
• Language: unknown
• Published: ASC 1999 2024
• Subjects: Fisheries and aquaculture; Arctic; Barents Sea
• Online Access: https://dx.doi.org/10.17895/ices.pub.25637652.v1; https://ices-library.figshare.com/articles/conference_contribution/Spawner_Quality_Effects_On_Two_Measures_Of_Reproductive_Potential_Have_We_Been_Counting_Our_Eggs_Before_They_ve_Hatched_/25637652/1

No abstracts are to be cited without prior reference to the author.Recent studies have found positive associations between recruitment and ii;tdices 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, ...