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Fig. 4 Lack of Crhr1 affects the thermal stress-mediated swimming performance. (A) The SMR of WT and crhr1−/− fish measured in a swim tunnel respirometer during the 1-h acclimation at either 28°C or 33°C before the forced swim. This value was taken as the single lowest MO2 measurement during acclimation at a water flow speed of 4.5 cm/s. (B) MMR of fish taken as the single largest MO2 value measured during the forced swim test. (C) Aerobic scope of fish calculated as the MMR − SMR. (D) Ucrit of fish following the forced swim test, where water flow was slowly increased by 4.5 cm/s every 10 min until the fish collapsed against the back grate of the swim tunnel. Asterisks indicate significant main effects (Two-way ANOVA, *p < 0.05, **p < 0.01). Crhr1, corticotropin-releasing hormone receptor 1; KO, crhr1−/−; MMR, maximum metabolic rate; MO2, metabolic rate; SMR, standard metabolic rate; Ucrit, critical swimming speed; WT, wildtype.