Fig. 1

Plasma levels of key stress response indicators (i.e. cortisol, glucose and lactate) in Atlantic salmon intermittently exposed to PAA. The right panel (A, C, E) displayed the levels in the samples collected during the 3 major sampling points (before, and at days 22 and 45 of intermittent exposure), whereas the left panel (B, D, F) displayed the measured levels in the samples collected during the first 2 weeks after the start of the intermittent application. Values presented are mean ± SE of 8 individual fish per sampling point (2 fish per replicate tank). Different letters denote significant difference at P < 0.05