A school of the "world's most expensive fish" was spotted jumping through the air off the coast of Cornwall.

The Atlantic Bluefin Tuna can sell for thousands, and sometimes, millions of pounds because of its high market value.

Their price tag makes bluefin one of the most valuable fish in the world.

They are also illegal to catch in the UK, CornwallLive reports.

If the endangered species are caught by accident they must immediately be released back into the sea.

Peter Nason, 37, was volunteering at St Ive's National Coastwatch Institution when he spotted a school of tun diving out of the water on October 23.

Atlantic Bluefin Tuna are known for being on the of the world's most expensive fish (

Image:

Peter Nason / SWNS)

This isn't the first time bluefin tuna have been spotted in Cornish waters.

It is believed the expensive fish were spotted near Porthcurno two months ago.

This particular species of tuna is the largest in the world. These torpedo-shaped fish are built for speed and power and travel huge distances in the open ocean.

They can grow to a maximum size of three meters and weigh up to 250 kilos.

The tuna returned to UK waters about a decade ago after being absent for nearly 100 years (

Image:

Peter Nason / SWNS)

They are endangered and reappeared in Cornish water in the past decade after being gone for nearly 100 years.

Bluefin tuna are now regularly seen in the autumn and summer.

They are not dangerous to humans and eat other fish.

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Tuna are warm-blooded with heat generated in their swimming muscles that allow them to accelerate rapidly and give them improved cognitive power and reactions.

They are incredible predators and are at the top of the oceanic food chain.

Tuna are not the only magnificent fish to be seen off the Cornish coast.

Tuna can sell for thousands, and sometimes, millions of pounds (

Image:

EPA)

Earlier this month, a 9ft blue shark with a fishing hook stuck in its face was spotted off the coast of Penzance.

The creature was found by Martin Yelland, 38, who was snorkelling 25 miles away from shore when he encountered the blue shark.

The postie was delighted to spot the predator but upset to see it had been snared by a huge lure, left sticking out its face.

Father-of-two Martin, from St Erth, Cornwall, said: "When I first saw the blue shark, I was totally buzzing.

"I've taken photos of wildlife for five years now, but there is something quite special about seeing a large shark up close."

He swam with the shark for about an hour before heading back to shore.

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