So I got home from work today and noticed 2 of my 6-8" goldfish are missing and one of my big Koi has some battle damage. At least they were just goldfish this time. Last year the asshole Heron got my favorite Koi. Which was $80. There's nowhere for them to hide this early in the year without the lily pads growing so I threw my kids inflatable pool in there for now. Anyway, I wanna kill this thing. The 12ga or .45 would be too risky in town. I've actually never shot, or even heard a .22. How loud is it? My backyard and pond is surrounded by a 7ft fence so I doubt anyone would know where it came from if the cops were called. Still pretty risky though. What about those Crossman air rifles, the ones that are over $100 and like 1200fps? Would it be enough to kill a large bird like a blue heron? Any other ideas?