Figure 4

Growth reaction norms between the mixed-strain treatment and single-strain treatment, experiment I. Family weight (log₁₀) norm of reaction between the two rearing treatments, for salmon of farmed, hybrid and wild salmon. Replicated tanks are pooled. Fish sizes were significantly higher in the mixed-strain treatment than in the single-strain treatment, and the elevation of the reaction norms were significantly different between salmon of farmed, hybrid and wild origin. The slopes between treatments were similar in the wild and farmed salmon, while the flatter slopes displayed by the hybrid salmon were significantly different to the slopes displayed by both the farmed and wild salmon. A significant correlation between mean family weight in the mixed-strain treatment and mean family weight in the single-strains treatment were detected in salmon of all origin.