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Fig. 3. Mean plasma cortisol concentrations in untreated rainbow trout Oncorhynchus mykiss (control; N=12) as well as those given an intraperitoneal implant containing either cortisol (50 mg hydrocortisone 21-hemisuccinate kg–1 fish; N=10) or cortisol+RU486 (500 mg mifepristone kg–1 fish; N=12). Values are means ± 1 S.E.M. Groups that do not share a letter were significantly different from one another (one-way ANOVA on ranks followed by Dunn's post hoc multiple comparisons test, P<0.001).