Fig. 1. (A) Seasonal change in temperature and daylength of the four experimental groups. Temperature increases in the advanced temperature group (ADV) began on February 14 (arrowhead). (B) Length (cm) and (C) condition factor (massxlength^-3)x100 in juvenile Atlantic salmon subjected to different photoperiod and temperature treatments. Values are means ± S.E.M. (N=12). There were significant effects of photoperiod, temperature and time on condition factor, and significant effects of temperature and time on length (P<0.05, three-way ANOVA). Vertical lines unconnected to other lines indicate a significant difference from other groups at that time; points without vertical lines are not significantly different from one another (P>0.05, Kruskal-Wallis test).