Condition And Size Composition Effects On The Simulated Relationship Between Spawner Biomass And Total Egg Production For Northeast Arctic Cod (Gadus Morhua L.). ...

• Main Authors: Kvalsund, Merete, Marshall, C. Tara
• Format: Conference Object
• Language: unknown
• Published: ASC 1999 2024
• Subjects: Fisheries and aquaculture; Arctic; Arctic cod; Gadus morhua; Northeast Arctic cod
• Online Access: https://dx.doi.org/10.17895/ices.pub.25637589.v1; https://ices-library.figshare.com/articles/conference_contribution/Condition_And_Size_Composition_Effects_On_The_Simulated_Relationship_Between_Spawner_Biomass_And_Total_Egg_Production_For_Northeast_Arctic_Cod_Gadus_Morhua_L_/25637589/1

No abstracts are to be cited without prior reference to the author.Spawner biomass (SB) is often assumed to be proportional to total egg production (TEP) by fish stocks. Recent studies suggest that this assumption may not be valid, particularly when the physiological condition of fish varies. This study used Monte Carlo techniques to simulate the relationship between SB and TEP for Northeast Arctic cod (Gadus morhua). In the first simulation exercise, reproductive traits reflecting condition (length-specific maturity, weight and fecundity) were varied according to food abundance ( capelin biomass) while the size composition (numbers at length) was held constant. lln the second exercise, the size composition, as described by the modal length of spawners, was varied and condition was held constant. In the final exercise, condition and size composition were varied simultaneously. The first exercise indicated that variation in TEP was not constant but increased as the SB increased. The second exercise showed ...