Definition of blackfin tuna
: a tuna (Thunnus atlanticus) that is found off the Atlantic coast of America from Massachusetts to Brazil and is bluish-black above and white below with silvery-gray sides and dark-colored fins Fishermen focused on pelagic big game species are reporting consistent action on blackfin tuna, along with a mix of mahi mahi, yellowfin tuna, amberjack and wahoo in the warm waters off of the Outer Banks. — Bob Jones, News Journal (Wilmington, Delaware), 12 Jan. 2012
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