Southern bluefin tunas often migrate vertically through the water column in search of their preferred temperature, and they spend time in cooler waters seeking prey. Some have hypothesized that they take refuge in warmer areas of water fronts and eddies after these foraging periods, but others suggest that these migrations are only associated with the aggregation of prey. Either way, it is clear that southern bluefin tuna have developed complex physiological mechanisms to maintain their body temperature (TB) significantly above the ambient water temperature in these changing conditions. In fact, tuna can maintain the temperature of their muscles at above the temperature of surrounding water. Overall, tuna do not have a set body temperature point; rather it maintains its TB within a narrow range, with variations of only over time and from individual to individual.