Deep Sea Fishing

Bluefin Tuna

Thunnus thynnus

Avg. Weight

200.0 lbs

World Record

1496.0 lbs

Found In

17 Destinations

About Bluefin Tuna

Atlantic Bluefin Tuna are the largest, most powerful, and most valuable tuna species in the world. These magnificent fish can exceed 1,000 lbs and are the ultimate test of angler and tackle. Their torpedo-shaped body is dark blue-black on top with silver-gray sides and a series of yellow finlets along the tail. Bluefin are warm-blooded — they maintain a body temperature well above the surrounding water, which gives them extraordinary power and stamina. Giant bluefin tuna can sell for hundreds of thousands of dollars at fish markets, making them one of the most economically important fish in the ocean.

Identification & Appearance

Massive, torpedo-shaped body with short pectoral fins (distinguishing them from yellowfin). Dark blue-black back, silver-gray sides, and silver-white belly. Yellow finlets with dark edges along the back and belly leading to the tail. Tiny scales creating a smooth, streamlined surface. Huge, crescent-shaped tail generating extraordinary thrust.

Male vs. Female

Males and females are identical in appearance and reach similar sizes. Bluefin tuna are long-lived (25-40 years) and slow to mature (8-10 years), which makes them vulnerable to overfishing.

Size, Weight & Records

"School" bluefin are 27-73 inches (15-200 lbs). "Giant" bluefin exceed 73 inches and 200+ lbs. Trophy giants run 500-1,000+ lbs. The world record is 1,496 lbs, caught in Nova Scotia, Canada in 1979. New England fish commonly exceed 800 lbs.

Seasonal Availability

Peak Season Good Fair Off Season

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Popular Bait & Fishing Methods

Best Techniques

Chunking (chumming with cut herring, mackerel, or butterfish while drifting) with baited hooks at various depths is the standard technique for school-size bluefin. Live bait fishing with mackerel, herring, or whiting produces trophy-size fish. Trolling with spreader bars, umbrella rigs, and large skirted lures covers water when fish are scattered. "Green stick" fishing (a specialized rig that dangles squid-shaped lures from a tall pole) is popular on the commercial and recreational fleet. Fly fishing for bluefin on 14-16 weight rods is the ultimate challenge.

Recommended Tackle

School bluefin (under 73 inches): medium-heavy spinning or 30-50 lb conventional. Giants (over 73 inches): 80-130 lb stand-up or chair gear, Shimano Tiagra or Penn International reels, 130 lb mono or braid, wind-on leaders to 300+ lb. Fights with giants can last 2-6+ hours.

Regulations & Bag Limits

Highly regulated by NOAA/ICCAT. School bluefin (27-73 inches): typically 2-3 fish per person per day. Giant bluefin (73+ inches): limited tag permits required. Regulations change frequently — check NOAA HMS website before fishing. Some areas require hail-out reporting before departing.

Regulations change frequently. Always verify current rules with your charter captain or state wildlife agency before fishing.