A Mandurah fisherman who took footage of an eerie light show off the coast Wednesday morning said he believes what he saw was a UFO.

The man, who does not wish to be named, said he was about 40 kilometres off-shore when he spotted the light shortly before dawn.

Grabbing his camera, the man managed to capture images of the light which he said moved and changed colours before disappearing with the sunrise.

“After nine years of fishing I've never seen anything like it,” he said.

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