blackfin tuna

The blackfin tuna (Thunnus atlanticus) is a species of tuna found in the western Atlantic Ocean, from Massachusetts to Brazil. It is characterized by its bluish-black upper body, white underside, and silvery-gray sides with dark fins. Blackfin tuna are generally smaller than other tuna species, with large individuals typically weighing around 40 pounds.12

Tunas, in general, are streamlined, robust fish belonging to the genus Thunnus. They are known for their ability to regulate body temperature, maintaining it above that of the surrounding water. This unique vascular system allows them to thrive in various ocean temperatures. The blackfin tuna is one of seven species in the Thunnus genus, which also includes well-known types like the northern bluefin and yellowfin tuna.3