Seafood tuna Tuna, a fish that lives in the ocean far from the shore, the ships that catch them have to go for months at sea, and withstand the triple barrier. Tuna is a highly nutritious seafood. Tuna is popular with restaurants, grilled or eaten raw, To catch the tuna, the fishermen have to spend months in the offshore. Tuna tuna with tens of kilograms has brought great fish flesh.