 The carotid rete carries blood to the brain and seems to play a role in the elevated temperatures of both the brain and the eyes of the southern bluefin tuna.The carotid rete has been observed to have strong insulation properties, allowing blood to travel a great distance throughout the body while reducing the amount of heat lost to surrounding tissues prior to the brain and eyes.The elevated temperatures in the brain and eyes allow the southern bluefin tuna to search for food more effectively by increasing reaction time and creating stronger vision.