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Fig. 1. (A) Injection of 8-OH-DPAT (N=6) had no effect on the appearance of urea in the water. (B) Fish injected with 8-OH-DPAT did show a significant increase in plasma cortisol levels; however, this increase was also measured in the saline-injected controls (N=16; ANOVA, P<0.001). All values are means ± 1 S.E.M.