Aku (Skipjack Tuna)

Good quality aku has firm flesh that is deep red in color. Flesh color varies with the size of the fish, with smaller fish having a lighter red color than larger fish; hence, larger aku are preferable for raw fish preparations requiring a red flesh. Larger aku have a greater fat content than smaller aku and this is another desirable attribute for raw fish dishes. Cooking causes the flesh to become lighter in color.