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Size-selected (167±11mm) female rainbow trout were: given a high (1·8μgg−1body weight per week) or low (0·35μgg−1) dose of recombinant bovine growth hormone (GH), delivered by cholesterol pellet implant; injected with a commercial bivalent (vibriosis–furunculosis) vaccine; provided with each dose of GH plus vaccine; implanted with a pellet alone; or left untreated (N=20 per group). Growth in each...