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Fig. 1. Plasma cortisol levels in low-responsive (LR) and high-responsive (HR) rainbow trout sampled after rearing in isolation (Control) and following a 1 h confinement stress period (Confinement). Values are means ± S.E.M., N=9 for each group. Post-hoc significance levels are indicated; * for a difference between controls and stressed fish, and {dagger} for a difference between LR and HR fish (*,{dagger}P<0.05, **P<0.01).