Yellowfin vs Bluefin Tuna: How to Tell Them Apart
Yellowfin vs bluefin tuna? Check the fins and the build. A yellowfin tuna is slender, with a long, bright yellow dorsal fin, yellow finlets and a yellow stripe down its side. A bluefin tuna is a heavier, almost round torpedo with a dark blue-black back, a reddish brown second dorsal fin and short pectoral fins. Bluefin also grow far bigger: up to 13 feet and 2,000 pounds, against about 400 pounds for a yellowfin.
Below is a quick comparison table, how each fish lives and grows, how anglers fish for them, and answers to the questions people ask most. Fish offshore? Browse our tuna fishing shirts.
Yellowfin vs bluefin tuna at a glance
| Yellowfin tuna | Atlantic bluefin tuna | |
|---|---|---|
| Scientific name | Thunnus albacares | Thunnus thynnus |
| Body shape | Torpedo-shaped, more slender | Large torpedo, nearly circular in cross-section |
| Fins | Bright yellow dorsal and anal fins and finlets; long yellow dorsal fin | Reddish brown second dorsal fin, short pectoral fins |
| Color | Metallic dark blue back, yellow to silver belly, yellow side stripe | Dark blue-black back, white lower sides and belly |
| Maximum size | Up to about 400 pounds | Up to 13 feet and 2,000 pounds |
| Lifespan | About 7 years | 20 years or more |
| First spawning | Age 2 or 3 | About age 8 |
Facts in this table come from NOAA Fisheries species pages for Atlantic yellowfin tuna and western Atlantic bluefin tuna.
How to identify a yellowfin tuna
NOAA Fisheries says yellowfin are "true to their name": their dorsal and anal fins and finlets are bright yellow. The agency adds that yellowfin "can be distinguished from other tunas by their long, bright yellow dorsal fin and a yellow strip down the side. They are also more slender than bluefin tuna."
On a big adult, the second dorsal fin and anal fin can grow long and sickle-shaped, which makes a yellowfin easy to spot when it is held up at the boat. Smaller fish still show the yellow finlets and side stripe.
How to identify a bluefin tuna
Bluefin are built for power. NOAA describes Atlantic bluefin as having "large, torpedo-shaped bodies that are nearly circular in cross-section." Look for these clues:
- Dark blue-black back with white lower sides and belly
- Colorless lines alternating with rows of colorless spots on the lower sides
- A reddish brown second dorsal fin
- Short pectoral fins
Size is the giveaway on a giant. NOAA calls bluefin the largest of the tuna species, reaching up to 13 feet and 2,000 pounds.
Growth, lifespan and range
The two fish live very different lives. Yellowfin "grow fairly fast" and have a short life span of about 7 years, and most can reproduce at age 2 or 3. Bluefin "grow more slowly than other tuna," can live 20 years or more and generally do not spawn until about age 8, according to NOAA.
That difference matters for management. NOAA's 2024 assessment lists Atlantic yellowfin as not overfished and not subject to overfishing. Western Atlantic bluefin are managed under a rebuilding plan, and targeted fishing for bluefin is not allowed in the Gulf of America, an important spawning area.
How to fish for yellowfin vs bluefin tuna
Yellowfin tuna
Yellowfin are a warm-water offshore target. Anglers troll skirted lures, cedar plugs and ballyhoo around weed lines, temperature breaks and floating debris, then switch to chunking or live bait when a school shows up. Spinning gear with poppers and stickbaits works when fish crash bait at the surface.
Bluefin tuna
Bluefin fishing ranges from school-size fish on light tackle to giants that need heavy stand-up or chair gear. Common methods include trolling spreader bars and ballyhoo, chunking, live bait and casting topwater lures to busting fish. Bluefin are tightly regulated: check current NOAA Atlantic HMS rules, permits and size limits before you go.
Which tastes better, bluefin or yellowfin?
It comes down to fat. Bluefin, especially the belly, carries more fat and has a rich, buttery taste prized for sushi. Yellowfin is leaner and milder, with firm red flesh that works well seared, grilled or as poke. Bluefin usually costs more, partly because it is scarcer and tightly managed.
Wear your favorite offshore fish
Our tuna fishing shirts come with a custom name, and many styles include long sleeve UPF and hooded options. Check each product page for the exact styles and sizes. Chasing other pelagics too? Read our guide on how to catch mahi mahi or compare blue marlin vs white marlin.
FAQ
What is the difference between yellowfin and bluefin tuna?
Yellowfin are slender with a long bright yellow dorsal fin, yellow finlets and a yellow side stripe, and reach about 400 pounds. Bluefin are heavier and rounder, with a reddish brown second dorsal fin and short pectoral fins, and can reach 2,000 pounds.
Which is bigger, bluefin or yellowfin tuna?
Bluefin. NOAA calls them the largest tuna species, up to 13 feet and 2,000 pounds. Yellowfin grow up to about 400 pounds.
Which is more expensive, yellowfin or bluefin tuna?
Bluefin usually costs more because of its fat content, demand for sushi and tighter catch limits.
How long do yellowfin and bluefin tuna live?
Yellowfin live about 7 years. Bluefin can live 20 years or more.
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