Significance levels of random and fixed effects included in the full linear mixed effect models (model 3) investigating variation in total length prior to the onset of exogenous feeding in salmon of farmed, hybrid and wild origin of C2011, C2012 and C2013.

<p>One model was fitted per cohort. Random effects: Dam; maternal identity. Strain/Fam; family nested within strain (9–10, 6–7 and 4–9 families per strain in C2011, C2012 and C2013, respectively), Family/Rep; replicate nested within family (4, 3 and 2 replicates per family in C2011, C2012 and C2013, respectively). Chi.sq; value of the Chi square statistics. Chi.Df; the degrees of freedom for the test. P; p-value of the likelihood ratio test for the random effect. Fixed effects: Strain; Mowi (C2011–C2013), Mowi × Figgjo (C2011–2013), Figgjo (C2011–2013), Figgjo × Mowi (C2012–2013), Vosso (C2012–2013), Arna (C2012–2013), SalmoBreed (C2013), SalmoBreed × Vosso (C2013), Skibotn (C2013). Log-egg; mean family log egg diameter (mm). Log-D: median family replicate log degree-days post hatch. “Fixed effect” × “fixed effect”; two-way interaction between the respective fixed variables. Sum.sq; sums of squares. Num.Df; numerator degrees of freedom. Den.Df; denominator degrees of freedom (Satterthwaite's approximation) F; F-value. P; p-value. Significant fixed effects are marked in bold. For differences in least squares means between strains in C2013, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0113697#pone.0113697.s002" target="_blank">File S2</a>.</p><p>Significance levels of random and fixed effects included in the full linear mixed effect models (model 3) investigating variation in total length prior to the onset of exogenous feeding in salmon of farmed, hybrid and wild origin of C2011, C2012 and C2013.