First you need to get a newsance permit. Contact a game warden. Dont put it off they eat 5 to 7 lbs of fish a day, do the math. And just like you saw they waste more than they eat. They may look quett but they will ruin a pond. Shooting in or over water is illeagal but works. Trapping works also. Look for or make runs out of the water to set traps. They make and use stools,a spot repeatedly used to feseate.They are close to a den or hole. Killem all good luck.
