Egg mortality of northeast Arctic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus)

to be 0.17 d 21 (95% CI: 0.15 – 0.19), which is significantly higher than that for haddock, 0.09 d 21 (95% CI: 0.07 – 0.12). Interannual variability in egg mortality ranges from � 0.12 to � 0.22 d 21 for cod and from � 0.04 to � 0.12 d 21 for haddock. The accuracy of these estimates was evaluated by the analysis of synthetic data constructed from a coupled physical –biological model, suggesting that mean mortality and the magnitude of interannual variability were estimated reliably, but not mortality for any given year.