Tongue-eating parasite surprises diner

The man took the creature back to the Morrisons supermarket in Llanelli, where he had bought the sea bass from the fishmonger's counter.

The parasite was then idenitified as Cymothoa exigua, which is more commonly known as the tongue-eating louse.

The parasite enters the fish through its gills, attaches itself to its tongue and then eats it.

They aren't usually harmful to humans, although if they are alive, they can bite.