Fig. 3. Time course of changes in cytochrome c oxidase activity during warm acclimation, expressed in U_CCO mg^-1 mitochondrial protein and U_CCO nmol^-1 cytochrome a (U_CCO=µmol cytochrome c reduced min^-1). Values are means ± s.e.m. (N=8 for cold acclimated trout, N=7 for short-term warm exposed trout and N=12 for warm acclimated trout). Different superscript letters indicate rates at a given assay temperature that differ between acclimation states (ANOVA and a posteriori test, P0.05).