I can't believe that no one (including Natester) posted a link to this video. By the way Nate owns a pond management company and, talk about hands on, if he can't figure out what is going on with your pond from the surface then he dons scuba gear and "swims with the fishes" (not in some frightening mafia sort of way, he literally swims with the fishes). Check out the video at the top of this link.
Nate's Porcupine fish attractor video Oh and I apologize for the rude entrance. Welcome to Pond Boss Fishinqueen, I prostrate myself before you (and no TomG that's not something naughty).