Figure 2. Gill score of Atlantic salmon fed different level and ratio of n-6 and n-3 FA and challenged with P. perurans.

Data presented as mean with standard deviation (n = 3). Two-way ANOVA followed by Tukey’s Multiple comparison was performed for factors diet and AGD challenge. Different letters indicate the significant differences between the time-points (p < 0.05). No significant effects between diet groups were detected at any time points. Diet 1/Diet 2/Diet 6/Diet 1H, diet codes are set according to dietary n-6/n-3 ratio. The final diet is labelled 1H due to its higher absolute contents of n-3 and n-6 compared to the first diet. AVG control, unchallenged fish.