Thunnus is known to be a type of ray-finned, ocean-dwelling bony fish belonging from the mackerel family, Scombridae. More accurately, Thunnus is one of five types which make up the family Thunnini – a family that is also called as the tunas, which is also known as the real tunas or true tunas. Tuna is a part of the mackerel fish family and is a very essential part of the global fishing scenario. Tuna is enjoyed around the world frozen, fresh-cooked, canned, and as sushi.