Figure 1. Effects of selection on survival and growth performances.

(A) Ten successive weight measurements were carried out during the first year of life. Growth curves are shown for the four line x diet combinations. Stars denote the significance of the diet*line interaction for body weight at every date of measurement (*: P<0.1; **: P<0.05; ***: P<0.01). (B) Selection gain for body weight (%) is calculated for fish fed with a plant-based (PB) diet (green line) and fish fed with a marine diet (blue line). The difference between the two gains is the PB diet-specific selection gain for the ability to grow when fed with a plant-based diet after one generation of selection. (C) The survival rate (%) was significantly higher in selected fish when fed PB diet when there was no difference between selected and unselected population when fed M diet. Different letters mean significant differences (P<0.05) between groups. (D) The coefficient of variation of body weight (%) was higher in groups of fish fed the PB diets throughout the trial, but was significantly reduced by selection in the case of the PB diet. Different letters mean significant differences (P<0.05) between groups.