A group of paddleboarders in Devon were stunned by the sight of an enormous fish following them up the river and filmed it circling in a menacing way.
They managed to capture the moment the huge shark-like creature glided within feet of their boards in the Exe estuary, Devon Live reports.
In the clip, two boarders enjoy an evening paddle across the water when their attention is drawn to a deep ripple in the water.
A second boarder films the ripple move closer before finally revealing a whopping-big fish swimming with its dorsal fin poking through the surface.
The stunned watersport fans then watch the fish make a second circle for the camera – its large tail clearly visible as it glides underneath the waves.
Coastguards were called with mistaken reports a dolphin was stranded in shallow waters.
In fact, the animal was a 10ft huge tuna fish, one of the sea's most voracious hunters although harmless to humans.
Exmouth Coastguard Rescue Team posted: "Tasked this evening alongside Beer Coastguard Rescue Team and representatives from British Divers Marine Life Rescue to a report of possible Dolphin(s) stranded in the area of the King George V recreation ground – known locally as the Duckpond.
Great white shark smashes into camera as predator shows off powerful jaws
"A further report from the Exe water taxi suggested it was a significant tuna which had followed SUP boarders into the area.
"This was confirmed upon our arrival by the aforementioned SUP boarders stating a size of around 8-10ft in length.
"After a short localised search, nothing was seen and we were stood down with no further action required. "
Bluefin tuna are one of the largest fish on the planet and can grow to 15ft long and weigh half a tonne.
Marine expert Owen Exeter confirmed it was a bluefin tuna and said the species was returning to the British Isles after decades of reduced numbers.
He said: "They are making a comeback in South West waters and are increasingly seen in recent years.
"Less usual to see them cruising by paddleboarders like that though.
"They are completely harmless albeit big fish. They are here to feed on small bait fish basically."
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