Blackfin tuna (Thunnus atlanticus) are the smallest Atlantic tuna — typically 5–30 lbs — but on light tackle they’re among the most exciting offshore fish available to Southeast and Gulf Coast anglers. Found year-round off South Florida, the Keys, and throughout the Gulf, blackfin are accessible without the long offshore runs required for yellowfin, and their willingness to bite makes them ideal for introducing anglers to tuna fishing.
Where to Find Blackfin Tuna
Blackfin tuna are found throughout the western Atlantic from Massachusetts to Brazil, with the largest year-round populations in South Florida, the Florida Keys, and the Gulf of Mexico. They’re accessible in 80–600 feet of water offshore, often associated with color changes, current edges, offshore ledges, and bait concentrations. Pushbutton Hill off Stuart is a famous blackfin spot. They frequently school with skipjack tuna and are sometimes found mixed with yellowfin.
Best Tackle
Light to Medium: Blackfin on light tackle is exceptional sport. Rod: 7″ medium to medium-heavy spinning. Reel: 4000–6000 spinning with 200 yards of 30–40 lb braid. Leader: 40–60 lb fluorocarbon — blackfin can be line-shy in clear water.
Top Techniques
Chunking: Drift with the current chunking butterfish or ballyhoo pieces. Same approach as yellowfin but scaled down. Live Bait: Live pilchards, small goggle eyes, or cigar minnows free-lined in a chum slick. Trolling: Small skirted lures and rigged ballyhoo at 7–9 knots. Blackfin will be the most common tuna raised on many South Florida trolling spreads. Popping and Jigging: Excellent when fish are on the surface. Small poppers (1–2 oz) and metal jigs cast into breaking fish.
Best Baits & Lures
- Live Pilchards: Top South Florida blackfin bait. Free-lined in a chum slick.
- Butterfish Chunks: Standard chunking bait offshore.
- Small Skirted Ballyhoo: Trolling standard — blue/white and pink/white.
- Metal Jigs (1–3 oz): Cast into breaking fish. Diamond jigs and Kastmasters are classics.
- Small Poppers: Exciting surface action when fish are busting on top.
Seasonal Patterns
Year-round (South Florida/Keys): The most consistent year-round tuna fishery available to Southeast anglers. Fall–Winter: Peak season off Stuart and the Treasure Coast — fish stack up at Pushbutton Hill. Summer: Present offshore throughout the Southeast and Gulf.
Pro Tips
- Light fluorocarbon in clear water: Blackfin can be finicky — drop to 40 lb fluoro if bites are slow.
- Keep the chum slick going: Consistent chunking is essential — don’t let the slick die.
- Match the bait size: Blackfin feeding on tiny baitfish won’t hit a large chunk. Look at what’s in the water and match it.
Regulations
Blackfin tuna have no recreational bag limit in federal waters at this time. Check current NOAA regulations before fishing.
Browse all species guides: How To Catch Fish — Complete Species Guides | Weekly Fishing Reports.
Best Blackfin Tuna Tackle
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1. Penn Battle III 5000 Reel
Reliable offshore spinning reel for blackfin — strong drag for their initial runs. Check price on Amazon
2. 40 lb Fluorocarbon Leader
Blackfin are leader-shy — 40 lb is the sweet spot between strength and visibility. Check price on Amazon
3. Small Skirted Ballyhoo Blue White
Standard trolling bait for raising blackfin on offshore color changes. Check price on Amazon
4. Metal Jig 2 oz Chrome
Cast into breaking schools — retrieve as fast as possible. Check price on Amazon
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