The Atlantic bluefin tuna is the largest of all tuna species and one of the most extraordinary fish on the planet — a warm-blooded, highly migratory apex predator that crosses the Atlantic Ocean multiple times throughout its life. Bluefin tuna maintain body temperatures up to 20°C above ambient seawater through a countercurrent heat exchange system, enabling high-performance predation in frigid northern waters. Once severely overfished, Atlantic populations are recovering following international catch quota agreements.
About the Tuna
Thunnus thynnus
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💡 Fun Facts
01
Bluefin tuna are endothermic — they maintain core body temperatures significantly above ambient seawater using a countercurrent heat exchange system called the rete mirabile, making them one of very few warm-blooded fish.
02
Bluefin tuna cannot stop swimming or they will die; they lack the ability to actively pump water over their gills and must swim continuously to force oxygenated water through their mouths — a process called obligate ram ventilation.
03
A single Atlantic bluefin tuna at Tokyo's Tsukiji Fish Market sold for $3.1 million USD in 2019 — the highest price ever paid for a single fish.
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Young bluefin tuna grow from a 1 mm egg to a 30 kg juvenile in just their first year, one of the fastest growth rates of any large vertebrate.
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Bluefin tuna can migrate over 9,700 km between their Atlantic feeding grounds and Mediterranean breeding grounds in a single year.
📍 Where to Find This Animal
Habitat Types:
Open Ocean (Temperate & Subtropical Atlantic)
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