Blackfin Tuna: Thunnus atlanticus


  • Second dorsal and anal fins not elongated
  • Bronze stripe on sides
  • Second dorsal fin dusky and all finlets dark with white edges
  • Long pectoral fin nearly reaches below the beginning of the second dorsal fin

Similar Species: Yellowfin tuna, T. albacares (elongated second dorsal and anal fins); and bluefin tuna, T. thynnus (has short pectoral fins and reaches a much larger size) 

Size: Common to 28 inches 


Coastal to offshore waters


Feed on small fishes, invertebrates and plankton.

Additional Information

Recreational Regulations

Image Credit: © Diane Rome Peebles

FWC Facts:
Horseshoe crabs do not bite or sting. Despite the ferocious look of the tail, it is not used as a weapon, but to right themselves if they are flipped over by a wave.

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