Tuna is any of a group of saltwater fish in the mackerel family. Tuna meat ranks as a popular food in many countries, especially in North America, Europe, and East Asia. The meat is sold canned, fresh, and frozen. Tuna also serves as a leading game fish. Major commercial types include the albacore, Atlantic bluefin, bigeye, Pacific bluefin, skipjack, and yellowfin tunas. China, Indonesia, and Japan rank as the leading tuna-fishing countries. More »