A good point about the downside of using the "lead" approach. If you kill them they will just be replaced, and how effective is a gun when they come and you are not there to use it?
I've dealt with them for years by purchasing a federal permit to take them out. However I'm at peace now as I don't have to constantly watch the ponds, and worry how many valuable fish are getting nailed at night.
The staked lines work 24/7.
