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Differences in behaviour between rainbow trout selected for high- and low-stress responsiveness

Øyvind Øverli^1,*, Tom G. Pottinger², Toby R. Carrick², Elisabeth Øverli³ and Svante Winberg⁴

¹ Evolutionary Biology Centre, Department of Animal Development and Genetics, Uppsala University, Norbyvägen 18A, S-752 36 Uppsala, Sweden,
² NERC Centre for Ecology and Hydrology, Windermere Laboratory, The Ferry House, Far Sawrey, Ambleside, Cumbria LA22 0LP, UK,
³ Uppsala University Hospital, SE-751 85 Uppsala, Sweden and
⁴ Evolutionary Biology Centre, Department of Comparative Physiology, Uppsala University, Norbyvägen 18A, S-752 36 Uppsala, Sweden

View larger version (12K): [in a new window]   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 for a difference between LR and HR fish (*,P<0.05, **P<0.01).

View larger version (18K): [in a new window]   Fig. 2. Box plot showing locomotor activity in low-responsive (LR) and high-responsive (HR) rainbow trout, when alone (isolated) and when challenged with a conspecific intruder (+ intruder). Post-hoc significance levels are indicated; * for a difference between fish in isolation and when intruder-tested, and for a difference between LR and HR fish (*P<0.05, ,P<0.01, ***P<0.001) (N=18 for each group).