There is a population of Silver carp in a lake I fish, Praire Rose State Park near Harlan,IA. last year when I took my boat out I was tooling around and they were just jumping all around me when ever I was running the motor. sometimes they hit to bottom of the boat one hit my Prop. It didn't do any damage to the '94 6hp Johnson but the silver carb was floating when I looked back I guess that would be one silver carp we won't have to worry about! I am sure they will have to kill off the lake in the next couple of years to get rid of them.