Bluefin Tuna
Warm-blooded and built like a torpedo, bluefin tuna are the pinnacle of big-game saltwater fishing — an oceanic fish that combines immense size, sustained speed, and endurance unlike anything else in the Atlantic.
Two distinct populations range across the North Atlantic and Mediterranean, following bait from cold northern feeding grounds to warm southern spawning areas.
The largest individuals can exceed 1,000 pounds, and even school-sized fish will test tackle and angler in ways that few other species can match.
Scientific Name: Thunnus thynnus
Also known as Atlantic Bluefin Tuna, Northern Bluefin Tuna, Tunny, Horse Mackerel
- Nearly circular in cross-section, with a dark blue-black back fading to white on the belly and faint colorless lines and spots along the lower sides — coloration that blends into open-ocean water from above and below.
- Short pectoral fins reaching only to the 11th or 12th spine of the first dorsal fin — the key field mark separating bluefin from bigeye and yellowfin tuna, which have noticeably longer pecs.
- Black-edged yellow finlets run from the dorsal and anal fins back to a stiff, crescent-shaped tail built for sustained high-speed swimming; the second dorsal fin is reddish brown.
- Common adults run around 6.5 feet; a 14-year-old fish can reach 8 feet and 700 lbs, with the all-tackle world record at 1,496 lbs. Maximum size approaches 13 feet and 2,000 lbs.
What to know
Habitat Distribution
- Two distinct Atlantic populations: the western stock spans from Labrador and the Gulf of Mexico south to Brazil; the eastern stock covers Norway to the Canary Islands, including the Mediterranean and parts of the Black Sea.
- A pelagic, open-ocean species that spends most of its life in the upper 100 meters of the water column, though it regularly dives to 500–1,000 meters and has been recorded as deep as 985 meters.
- Warm-blooded physiology lets bluefin tolerate water from near-freezing (3°C) to 30°C — a thermal range that allows them to follow bait from cold northern feeding grounds to warm southern spawning areas across entire ocean basins.
Specific Spots
- Rips, temperature breaks, and current edges where herring, mackerel, or sand eels get pushed to the surface are the most reliable starting points — the fish are where the bait is, and bait concentrates at water-mass boundaries.
- Seamounts and underwater structure in open water create upwellings that pile up forage, drawing fish that might otherwise be scattered across miles of featureless ocean.
- Surface-feeding fish blitzing bait are the most visible and castable opportunity; early morning and late afternoon are the most productive windows, and birds working over breaking fish are the fastest way to locate them.
Bluefin Tuna FAQ
Answers from onWater's species guide.
What are the best lures and bait for Bluefin Tuna?
Trolling large skirted lures or hard-body swimmers like Nomad Madmacs at 11–15 knots covers water efficiently and triggers reaction strikes from fish that may not be actively surface-feeding.
What do Bluefin Tuna eat?
Herring, mackerel, and bluefish are the primary forage for adult bluefin, which is why large trolling lures and live-lined baitfish are the most consistent producers. Match the size and profile of whatever bait is in the area.
Where do Bluefin Tuna live?
Two distinct Atlantic populations: the western stock spans from Labrador and the Gulf of Mexico south to Brazil; the eastern stock covers Norway to the Canary Islands, including the Mediterranean and parts of the Black Sea.
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