Shorefishes of the Greater Caribbean online information system

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Species: Thunnus thynnus, Bluefin Tuna

All Families:   All Genera:   All Species:

lower body - pale bars & spots
D2 brown; A & finlets yellowish + dark edges
tail base: central keel black
gill rakers 34-43
pectoral < head, ends well before D2

Thunnus thynnus (Linnaeus, 1758)

Bluefin Tuna

Body robust, fusiform, moderately compressed; no fatty eyelid; teeth slender, conical; top of tongue with 2 cartilaginous ridges; 34-43 gill rakers; 2 dorsal fins, barely separated, XII-XIV + 13-15, first with prolonged spines anteriorly, giving a strongly concave outline; 2nd dorsal and anal fins not greatly elongated; 8-10 finlets after dorsal fin, 7-9 behind anal fin; pectoral fins very short (<80% of head length); 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 below; lower sides of freshly caught fish with colorless transverse lines alternating with rows of colorless dots; first dorsal yellowish or bluish, second dorsal reddish brown; anal fin and finlets dusky yellow with dark edges; central keel black in adults.

Size: reaches ~330 cm; 679 kg.

Habitat: oceanic pelagic.

Depth: 0-580 m.

Both sides of the North Atlantic; Labrador to NE Brazil.

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  • Marine
  • Marine Only
  • Offshore
  • Offshore Only
Water Column Position
  • Mid Water
  • Near Surface
  • Surface
  • Water column only
  • Water column
FishBase Habitat
  • Pelagic
Feeding Group
  • Carnivore
  • Data
  • Data
  • Sharks/rays
  • Bony fishes
  • Octopus/squid/cuttlefish
  • Pelagic crustacea
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • Transatlantic (East+West Atlantic)
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
  • Endangered
  • Listed
  • Not listed
Length Max
  • 330
Depth Range Min
  • 0
Depth Range Max
  • 580