Do lampreys bite people?

Yes, they do!
I was swimming in a fresh water reservoir in NW Spain, when something bit my thigh. I saw what I thought was a brown fish, about 8 inches long attached to my leg. I quickly brushed it off, but it came back for another bite! I've never swam so fast!! When I looked at my leg later I had a red round mark with definite tooth marks. It could only have been a lamprey.