Most popular sushi fish is tuna!
Tuna is very popular sushi fish in Japan. There are three kinds of tuna – re “Otoro (belly of tuna. Fatty tuna, Taste great!)”, “Chutoro (medium fatty tuna)” and “Akami (lean tuna)”. They are usually eaten with soy source (Shoyu, sometimes called “Murasaki” in sushi restaurants) and a little bit of wasabi. Kinki University succeeded in the complete farm raising of Bluefin Tuna for the first time in the world and there are sushi restaurants that use their farm-raised special tuna. They are located in both Tokyo and Osaka. You might want to check it out!