Animation constructed from images taken of individual in Fig. S1 over 35 days of development following upshift. Images were aligned by eye, skewed and adjusted for minor differences in magnification and fish orientation as necessary. Smooth transitions between frames were achieved using Adobe ImageReady.

Animation constructed from images of individual in Fig. S2 taken over 42 days of development following downshift. Images were aligned by eye, skewed and adjusted for minor differences in magnificationand fish orientation as necessary. Smooth transitions between frames were achieved using Adobe ImageReady

Fig. S2. Fms activation rescues xanthophores and melanophore stripes. (A) A representative fms^174A homozygote reared at 33°C. (B) The same individual an in (A) after downshift to 24°C and an additional 42 days of development. (C) Different individual that achieved an essentially wild-type pattern of melanophore stripes after being reared at 33°C to the stage shown in A followed by transfer to 24°C and maintenance at this temperature for 4 months. Xanthophores are not discernable in this fixed individual.