Back has a dark metallic blue color while the lower sides and underbelly are white. Bigeye tunas do indeed have larger eyes than other species of tuna.
Found throughout the Gulf in the open ocean. While they have been known to come closer to the surface, bigeye tuna tend to stay deeper than most other tuna species, up to 1,000 feet.
Finding bigerye tuna is the hard part, as unlike other tuna, they rarely show themselves at the surface, especially during the day. Trolling where they tend to swim with marlin-tpe lure may be your best hope to get them while they’re down deep. Midnight Lump near the Mississippi canyon is a prime fishing location for bigeye tuna.