The Blackfin Tuna is a type of fish that appears in GTA 6, though it's not yet confirmed whether or not it can be found in the wild.
The only Blackfin Tuna confirmed to appear in the game is the one mounted on the wall in the convenience store shown being robbed in Trailer 1.
Even then, it's unclear whether the fish is a legitimate taxidermy or simply a replica.
Regardless, the Blackfin Tuna is a major sport fish in Florida, on which the State of Leonida is based. In fact, the world record for heaviest Blackfin Tuna was broken in Florida, by a fish weighing over 45 pounds.
Blackfin Tuna spawning tends to occur off the coast of Florida during the warmer months of the year.
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