Calculated influence of three egg components on egg specific gravity (ρegg) for Atlantic cod based on observed ranges of the components.

I: Influence of fraction of chorion volume in percent of total egg volume, (Vcho/Vegg)×100, by keeping the two other components constant and at average values. The observed upper value is based on smallest observed egg (D = 1.20 mm) [13] combined with the thickest observed chorion (t = 9.0 µm) [30] and the lower value is based on the largest observed egg (D = 1.50 mm) [13] and the thinnest observed chorion (t = 3.7 µm) (present study). II: Influence of the fraction of perivitelline space in percent of total egg volume, (Vpvs/Vegg)×100, by keeping the two other components at constant and at average values. III: Influence of specific gravity of yolk plus embryo, ρyolk+emb, by keeping the two other components constant and at average values. The observed ranges of egg diameter, D, and chorion thickness, t, are based on the literature. All other ranges are based on the present data.