tuna means: An aquatic fish that is related to the mackerel. This is the most common fish in canning. Tunas are known for their rich, flavorful flesh. They have moderately high fat levels and a firm texture. (in Cooking Dictionary)

What else does tuna mean?

A great steak fish as well as the most widely canned fish. It has tender and flaky flesh and is highly popular. (in Cooking Dictionary)

This fish is a member of the mackerel famiy and is a favorite for canning. You can find many types of tuna including bluefin, yellowfin, bonito, and albacore. (in Cooking Dictionary)