Figure 4.

Mean mass (g) of the crosses reared over summer (A) and over winter (B) in two natural lakes, CPH and PPH. Points represent the cross means and associated standard error, and letters indicate significant differences among cross types. Only the fish sampled from PPH at the end of summer showed significant differences in size. Crosses are pure wild (W; 0% domesticated alleles), second-generation backcross (BC₂; 12.5% domesticated alleles), first-generation backcross (BC₁; 25% domesticated alleles), F₁ hybrid (F₁; 50% domesticated alleles) and pure domesticated (D; 100% domesticated alleles). The lines connecting the D and W means indicate a priori expectation of additive genetic effects.