Bigeye Tuna
No tuna in the open ocean runs a deeper daily commute than the bigeye — down to 200–300 meters in cold water by day, back toward the surface after dark to feed.
That vertical migration defines everything about how you fish for them: timing, depth, and presentation all hinge on catching that nightly rise.
Bigeye run larger on average than yellowfin, with fish over 200 pounds showing up regularly in productive canyon fisheries across the Atlantic, Pacific, and Indian Oceans.
Scientific Name: Thunnus obesus
Also known as Ahi
- The oversized eye is the quickest field mark — proportionally larger than a yellowfin's, and obvious at boatside when you're trying to sort the two species.
- Back is dark metallic blue fading to white on the belly; the first dorsal fin runs deep yellow, finlets are bright yellow with black edges — a color pattern shared with yellowfin but paired with that distinctive eye.
- Robust, torpedo-shaped body with a very slender caudal peduncle carrying a strong central keel flanked by two smaller keels; pectoral fins are moderately long on larger fish.
- Most fish in active canyon fisheries run 120–200 lbs; the all-tackle record is 392 lbs, and the species can reach 463 lbs and over 8 feet in length.
What to know
Habitat Distribution
- An open-ocean, pelagic species spread across tropical and warm-temperate waters of the Atlantic, Pacific, and Indian Oceans — notably absent from the Mediterranean Sea.
- Highly migratory, with no ocean basin holding a resident population year-round; in the western Atlantic, the range runs from near Nova Scotia south to Brazil, with fish pushing poleward along the shelf edge as summer temperatures climb.
- Management is handled by international commissions across all three ocean basins (ICCAT, IOTC, WCPFC), reflecting just how far these fish move.
Specific Spots
- Canyon notches, corners, and steep drop-offs concentrate bigeye because the abrupt structure drives upwelling that pushes baitfish and squid into range — the 100-fathom line is a starting point, but fish often hold much deeper during daylight.
- Depth matters more than any fixed location: bigeye sit at 200–300 meters through the day, then rise to within 50 meters of the surface after dark, so the productive window is tied to that vertical migration rather than a specific piece of bottom.
- Fish Aggregating Devices (FADs) and naturally floating debris pull bigeye in open water — any floating structure is worth a slow pass during the low-light bite when fish are already moving up in the water column.
Bigeye Tuna FAQ
Answers from onWater's species guide.
What are the best lures and bait for Bigeye Tuna?
Skirted trolling lures, Ilanders, White Knights, and similar offshore-style heads, are the go-to for the dawn and dusk trolling bite when fish are within reach of the surface spread.
What do Bigeye Tuna eat?
Squid, mackerel, lancetfish, and smaller baitfish are the core forage, which is why chunking with butterfish, sardines, or squid is so effective: you're matching what bigeye are already keyed on as they rise from depth.
Where do Bigeye Tuna live?
An open-ocean, pelagic species spread across tropical and warm-temperate waters of the Atlantic, Pacific, and Indian Oceans, notably absent from the Mediterranean Sea.
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