Fig. 6. Muscle enzymes in relation to cold acclimation. Open bars (warm acclimated) represent the activities of muscle enzymes prior to cold acclimation (week 0). Solid bars are fish that were not given the anemic treatment but were exposed to the entire thermal regime outlined in Fig. 1 (i.e. 25 weeks). Shaded bars are fish that were made anemic at week 0, then exposed to the thermal regime outlined in Fig. 1. Error bars = 1 S.E.M. (^*Significantly different from warm-acclimated controls.) RBC, red blood cells.