Lamprey Scientific Name: Petromyzontiformes Interesting Facts: 1. These creatures are able to live in both fresh water and salt water. 2. Some lampreys are parasites. They attach themselves to other fish with their mouths. Then they bore into the fish with their teeth and suck the fish’s blood. 3. They secrete mucous-like slime when threatened by a predator. This slime makes the predator gag and back off.