Fig. 2. The forced exercise model used to examine the thermal plasticity of swimming in the goldfish (Carassius auratus L.) The maximum speed that could be sustained for 2min in a rotating chamber is shown as a function of test temperature for fish acclimated to 5°C ([UNK]), 15°C (), 25°C () and 35°C (). Adapted from Fry and Hart (1948) with permission.