The sturgeon is rarely seen in UK waters and is classified as a royal fish, meaning the Queen had to be consulted before it was sold on.

Buckingham Palace has said that Mr Davies can keep the fish and it is due to be sold on Thursday.

Mr Davies, from Llanelli, who has been a fisherman for three years, said: "It was a normal day - apart from the fact I caught a valuable fish.

"To be honest, I didn't know what it was.