Figure 4.9 Acclimation to different temperatures. Goldfish raised at low temperatures swim faster in cold water and more slowly in warmer water. Individuals raised at high temperatures swim faster in warmer water than in cold water.
After F. E. J. Fry and J. S. Hart, Cruising speed of goldfish in relation to water temperature, J. Fish. Res. Bd. Can. 7 (1948): 169–174.