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The influence of chronic cortisol elevation on metabolism, body composition, and fuel use patterns was examined in juvenile rainbow trout (Oncorhynchus mykiss). Measurements were performed in a control group (day 0) and in two experimental groups at days 3, 10, and 30 after treatment with a cortisol implant or a sham implant. All fish were fed 1% daily ration. Measured plasma cortisol levels were highest at day 3 and returned close to normal values by day 30 in cortisol‐implanted fish. No plasma cortisol elevation was observed in the sham group. Growth was depressed in the cortisol‐treated fish. Cortisol elevation resulted in increased plasma glucose concentrations during the entire experimental period, elevated CO₂ production at day 3 and 30, and an elevated respiratory quotient (RQ) exceeding 1.0 on these days. Nitrogen excretion, estimated as the sum of ammonia‐N plus urea‐N excretion, and the …