Maguro (mah-goo-roh) is the Japanese term for bluefin tuna, perhaps the best known and most commonly eaten fish in all of sushi dining. Used in many rolls, but often seen by itself, what is now the old stand-by was not always the most popular item on the menu. While currently suffering from incredible demand, tuna was, until the 1970’s, a sport fish commonly known as "horse mackerel" and sold to companies for cat food or thrown away. Now, its fatty belly meat, known as ‘toro’ is one of the more expensive items on the menu, prized for its taste, texture, and scarcity. Tuna has come a long way from being a fish the samurai considered unclean and would not eat, to one of the most popular fish in Japan, and the world around.