Akami Tuna

Akami is a part of bluefin tuna that refers to lean red meat. This is the main part of the fish, so it's more readily available than the other parts, called chūtoro and otoro. It has the least fat out of the whole tuna, which makes it the most affordable.

Akami is typically used atop rice in sashimi or nigiri. In a sushi restaurant, if you order maguro (a broad term for tuna), you will get akami from whichever species of tuna they have on hand. This part of tuna also has the most umami tuna flavor of all other, fattier cuts.