Northern Bluefin Tuna

Reaching more than six feet long and weighing up to 1,500 pounds, the giant northern bluefin tuna has the unique ability among fish to regulate its body temperature. By conserving heat in cold waters, bluefin can swim long distances between their feeding and spawning grounds—and have even been known to migrate between North American and European waters several times a year. However, as sardines, herring, and other prey move into different waters in response to global warming, bluefin tuna find it more difficult to build up energy reserves needed to make the long journey to spawn. Already severely over-fished, these majestic swimmers will find the added threat of global warming even more threatening to their survival.

Scientific name: Thunnus thynnus
IUCN Red List: Data Deficient
Region: Oceans