Physiology of Finfish and Shellfish (2+1)

4.1.7. Activity Effects

In all animals, a higher rate of physical activity (exercise) oxidizes more calories. In fish, whose metabolic rate is affected by the oxygen content of the water, the oxygen effect interacts with the activity effect. As the rate of activity increases, the fish needs more oxygen in the water to sustain aerobic metabolism, therefore the critical point shifts to the right.