Bluefin Tuna
Thunnus thynnus
A warm-powered athlete built to cross an ocean.
Atlantic bluefin tuna are torpedo-shaped travelers with muscles made for speed and endurance. Juveniles grow from school-sized hunters into some of the largest bony fish in the Atlantic.
Find this SeaPal in the card gallery
From field guide to game table
Bring this Bluefin Tuna home
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- 2 copies
Ready-to-play deck
Open Ocean Deck
Includes 2 cards featuring Bluefin Tuna across 2 card versions.
Quick dive
Creature passport
- Home
- They migrate across the Atlantic between rich feeding waters and warm spawning areas.
- Favorite foods
- They hunt fishes, squid, and crustaceans, with prey changing as they grow.
- Size check
- Up to about 10 ft (3 m) and 1,000 lb (450 kg)—motorcycle-heavy
Tell-your-friends facts
Four wonderfully wild things
- 1
Bluefin can cross the Atlantic and later return to familiar spawning regions.
- 2
Grooves let them tuck in several fins to reduce drag while swimming.
- 3
They must keep water flowing over their gills as they cruise.
- 4
Tiny finlets behind the main fins help smooth fast-moving water around the body.
Ocean superpower
Built to be amazing
Special heat exchangers keep their swimming muscles warmer than the surrounding sea.
Junior scientist tip
What should I look for?
Spot a thick, streamlined body with a dark blue back and short yellow finlets.
Grown-up research links
We used trusted science organizations to check this profile.