A Norwegian fisherman has been given a rather unusual shock after finding a large, orange vibrator in the stomach of the fish he was gutting.

Bjorn Frilund, 64, was fishing in the waters around his home town of Eidsbygda in western Norway when he caught the 5kg cod.

As he began to cut into the fish he found two semi-digested herrings – nothing too surprising.

But as he dug a little deeper, he couldn't believe what he saw – a large, bright orange vibrator.

"I was astonished," Mr Frilund told The Local. "It was totally unexpected. I had never seen anything like this before."

His theory is that the cod mistook the vibrator for a tasty cephalopod.

"Fish eat all kinds of different things, and the dildo looks like what the fish eat," Mr Frilund said.

"We have a kind of multi-coloured octopus in Norway, maybe the cod thought this was one of these and ate it."