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Species: Thunnus atlanticus, Blackfin Tuna

All Families:   All Genera:   All Species:

D & A & finlets dusky
gill rakers 19-25
pectoral reaches under D2, tip straight

Thunnus atlanticus (Lesson, 1831)

Blackfin Tuna

Body elongate, fusiform, moderately compressed; no fatty eyelid; teeth slender, conical; top of tongue with 2 cartilaginous ridges; 19-25 gill rakers; 2 dorsal fins, barely separated, XIII + 14-15, first with prolonged spines anteriorly, giving a strongly concave upper profile; 2nd dorsal and anal fins not greatly elongated; 7-9 finlets after dorsal fin, 6-8 behind anal fin; pectoral fins moderately long, reaches under front of 2nd dorsal, usually 22-31% of fork length, tip straight; a short, forked bony process between pelvic fins;1 large + 2 small keels on tail base; tail fin deeply forked; indistinct corselet of larger scales on front of body, small scales cover body behind corselet; lateral line complete.

Back metallic dark blue, becoming silver on sides and belly; second dorsal and anal fins and finlets dusky with silvery cast.

Size: reaches 120 cm; 23 kg.

Habitat: oceanic pelagic.

Depth: 0-200 m.

Massachusetts to southern Brazil.

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  • Marine
  • Marine Only
  • Offshore
  • Offshore Only
Water Column Position
  • Mid Water
  • Near Surface
  • Surface
  • Water column only
  • Water column
  • Flotsam
FishBase Habitat
  • Pelagic
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Octopus/squid/cuttlefish
  • Pelagic crustacea
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends N + S of GC
  • Extends North of GC
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 120
Depth Range Min
  • 0
Depth Range Max
  • 200