Tuna live in the open sea of oceans worldwide, although specific zones are dependent on species. The bluefin tuna, for example, lives in tropical and temperate waters of the Atlantic, the Pacific and the Mediterranean. The bigeye tuna lives in the previously mentioned areas with the exception of the Mediterranean.
The Atlantic bluefin tuna is large, powerful fish capable of reaching over 6.5 feet in length and weighing over 550 pounds. The coloring of the Atlantic bluefin includes countershading, where the top of the fish is a metallic blue, and the bottom is silver-white. Unlike most fish, the Atlantic bluefin is warm-blooded and capable of living in colder waters. The Atlantic bluefin is prized among fisherman for its athleticism and size.