Johan Hjort Symposium, Bergen, NO7 Oct. 2014 Do eggs collected in surveys accurately reflect adult fecundities? Hannes Höffle 1, Frode B. Vikebø 1, Olav.

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Johan Hjort Symposium, Bergen, NO7 Oct Do eggs collected in surveys accurately reflect adult fecundities? Hannes Höffle 1, Frode B. Vikebø 1, Olav S. Kjesbu 1 Johan Hjort Symposium, Bergen; NO 07 October Institute of Marine Research and Hjort Centre for Marine Ecosystem Dynamics, Bergen, NO

Johan Hjort Symposium, Bergen, NO7 Oct Spawning stock biomass (SSB) Population fecundity Stock reproductive potential (SRP) Measurments of fecundity

Johan Hjort Symposium, Bergen, NO7 Oct Potential: Number of maturing oocytes Realized: Number of eggs in the Sea How well do they match? Population fecundity

Johan Hjort Symposium, Bergen, NO7 Oct Sampling error Size and age structure Atresia Egg mortality Movement between different batches Sources of Error

Johan Hjort Symposium, Bergen, NO7 Oct North East Arctic cod

Johan Hjort Symposium, Bergen, NO7 Oct Spawning migration survey Mar. – Apr., since 1985 Acoustics CTD Bottom Trawls (N=902) Ichthyoplankton (N=2114)

Johan Hjort Symposium, Bergen, NO7 Oct Temperature at 30 m Offshore: Warm Atlantic water Inshore: Cool runoff influenced water Cooling in Vestfjorden

Johan Hjort Symposium, Bergen, NO7 Oct Models of Stage I egg distribution Generalized additive mixed models (GAMMs) Separate for areas 00 (Vestfjorden) and 05 (Yttersida) Models for presence/absence and non-zero abundance Fixed Factors Local temperature at 30 m Bottom Depth Proportion of old fish (age-9+) Regional temperature index (Kola transect) Random Factors Autocovariate Median Year Day

Johan Hjort Symposium, Bergen, NO7 Oct Models of Stage I egg distribution – 00 Vestfjorden Höffle et al. 2014

Johan Hjort Symposium, Bergen, NO7 Oct Models of Stage I egg distribution – 05 Yttersida Höffle et al. 2014

Johan Hjort Symposium, Bergen, NO7 Oct Real and modeled egg distribution Höffle et al Survey DataModel

Johan Hjort Symposium, Bergen, NO7 Oct Scaling to annual egg production σ.... Standard Deviation t.... Day of the Year N (t).... No. eggs at day t Peak spawning: Days 93 and 98 (>69°N) Standard Deviation: 15

Johan Hjort Symposium, Bergen, NO7 Oct Potential fecundity – NEA cod Gonad samples Winter and Lofoten cruise 191 fish Number and size of oocytes Image analysis (auto-diametric)

Johan Hjort Symposium, Bergen, NO7 Oct Potential fecundity vs. length

Johan Hjort Symposium, Bergen, NO7 Oct Potential fecundity vs. weight

Johan Hjort Symposium, Bergen, NO7 Oct Scaling to population fecundity Length and Weight based formulae Data from Stock assessment and survey Length, weight, maturity and numbers at age Sex ratio

Johan Hjort Symposium, Bergen, NO7 Oct Potential and realized fecundity -38 % vs. Length -52 % vs. Weight

Johan Hjort Symposium, Bergen, NO7 Oct Conclusion and outlook Highly variable relationship of realized and potential fecundity What next? Include atresia, mortality and drift Resolve spatial distribution of fecundities

Johan Hjort Symposium, Bergen, NO7 Oct Acknowledgements Captains and crews of the ships involved. ICES for additional CTD data. AFWG for stock data. Dr. Svein Sundby Dr. Per Solemdal Dr. Arved Staby Thank you!