Bluefin Tuna at the Hopkins Marine Station, Monterey Bay Aquarium in California (©Monterey Bay Aquarium/Randy Wilder) Biology Oceanography Zoology 

Tuna Stay Warm with Cold Hearts

The heart of a bluefin tuna keeps pumping during extreme temperature changes that would stop a human heart, according to a joint team of scientists from the University of Manchester and Stanford University. Pacific bluefin tuna are top predators renowned for their epic migrations across the Pacific Ocean. They are also unique amongst bony fish as they are warm bodied (endothermic) and can raise their core body temperature to 20°C above that of the surrounding water. They can also dive down into much colder water 1000 meters or more below…

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