Blackfin are a wide bodied tuna with a black back and amber stripe above the lateral line. These tuna have silver bellies and heavy skin. Their finlets are dusky colored with the slightest bit of yellow on them.
Their range is limited to the Atlantic from the northeast U.S. to Brazil. They are found in both coastal waters and far offshore. They are often found schooling with other species of tuna, such as yellowfin and skipjack.
They are caught trolling baits and lures, but live bait and poppers will also take these schooling fish. Vertical jigs do very well when jigged into schools of tuna around the rigs or under birds.