Tasmanian fishermen film three-hour encounter with great white shark

Two Tasmanian fishermen have filmed an unexpected encounter with a great white shark in Bass Strait.

Shaun Scarfe and Evan Richards were in their boat about 20 kilometres from Devonport on Thursday when a female great white approached it.

The men estimated the shark was about four metres long.

It continued to swim around the boat for about three hours.

Mr Scarfe said they captured more than an hour of footage using a waterproof camera on a pole.

"We just poked the camera down and we actually gave it a bit of a pat on the dorsal a couple of times and it just came right up and bumped the boat," he said.

"It was pretty friendly, it wasn't overly aggressive or anything like that."

The shark scared away their catch but the men returned home with an impressive fishy tale.