How do you tell a big eye tuna from blue fin tuna?

Big Eye tuna and Bluefin tuna are two of the most common tuna species found in the world's oceans. They have many similarities, including their size and appearance. However, there are also some key differences that make it possible to tell them apart.

Size

Bluefin tuna is generally larger than Big Eye tuna. Bluefin tuna can grow up to 1,900 pounds, while Big Eye tuna typically weigh less than 400 pounds.

Head

The head of a Bluefin tuna is more pointed and cone-shaped than the head of a Big Eye tuna. Big Eye tuna have larger, rounder heads.

Fins

The second dorsal fin of a Bluefin tuna is taller and more sickle-shaped than the second dorsal fin of a Big Eye tuna. Big Eye tuna have longer pectoral fins that extend beyond the second dorsal fin.

Body Shape

Bluefin tuna have a more rounded, oval-shaped body, while Big Eye tuna have a more streamlined, torpedo-shaped body.

Color

Bluefin tuna are generally a darker blue color than Big Eye tuna. Big Eye tuna have a more greenish-blue coloration.

Habitat

Bluefin tuna are found in both the Atlantic and Pacific Oceans. Big Eye tuna are found primarily in the Indian and Pacific Oceans.