🐾 Tuna

Tuna

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Scientific name: Thunnus thynnus
Family & relatives: Tunas are fast fish in the mackerel family; the Atlantic bluefin is one of the largest species.
How to spot it: A sleek, muscular fish with a metallic blue back, silvery sides, and small finlets near the tail.

Size: Bluefin tuna commonly reach about 2 meters and can grow beyond 3 meters.
Weight: Large bluefin often weigh several hundred kilograms, with records over 600 kilograms.
Body & adaptations: A torpedo body, retractable fins, and warm-blooded muscles that power nonstop swimming.
Top speed: An extremely fast swimmer able to reach high speeds in short bursts.
Strength: Its signature ability is staying warmer than the water, letting it swim fast in cold seas.
Senses: Sharp vision and a good sense of smell help it find prey across open water.
Growing up: Hatches as a tiny larva and grows fast, taking several years to reach breeding size.

Habitat: Lives in the open ocean, crossing entire seas on long migrations.
Where in the world: The bluefin ranges across the Atlantic Ocean and the Mediterranean Sea.
Territory: Not territorial; it travels thousands of kilometers in roaming schools.

Diet: A fast-swimming predator that chases smaller sea animals.
Favorite foods: Eats fish like herring and mackerel, plus squid and crustaceans.
How it hunts: Uses bursts of speed to chase down and swallow fast-moving prey.

How it moves: Swims constantly, driving forward with a powerful stiff tail.
When it is active: Active around the clock, since it must keep swimming to breathe.
Family life: Often swims in schools, sometimes grouped by similar size.
How it talks: Relies on vision to stay coordinated in tight, fast-moving schools.
Babies: Females release millions of eggs in warm waters during the spawning season.

Role in nature: A key open-ocean predator and an important prey for sharks and marine mammals.
Conservation: Atlantic bluefin was heavily overfished; careful management has helped some recovery.
Dangers: Young are eaten by many predators; adults are mainly caught by fishing fleets.

How long it lives: Bluefin tuna can live around 35 to 40 years.
In our culture: Prized worldwide for sushi and sashimi, with top bluefin selling for huge prices.
Where to see it: Rarely seen by swimmers; a few large aquariums keep tuna in giant tanks.
Fun fact: Tuna are warm-blooded like us, unusual for fish, which helps them power through cold seas.

Video: Pixabay · Photos: Wikimedia Commons & Pixabay