Just remembering the old days (well, I have been a fishmonger for 45 years!) when I had a chance to buy some lampreys at Billingsgate.  In those days nobody worried about refrigeration and I was using my old Mini Clubman because my van had broken down.  Some must have escaped while I was driving back to Reading and I wasn't popular with my wife later in the day, she found lampreys dropping off the headlining onto her as she was driving.  They are like tiny eels that stick with their mouth to prey and suck the blood.  Lucky they thought the headlining was the prey and not my wife!  Henry I apparently died from eating too many lampreys, and according to Wiki, the Queen had a coronation pie of lampreys made by the RAF.