There is one small problem with using a trap. I have to go to a public park lake to do this. Meaning I can't set a trap and leave it for any long period of time. I might just put together a rectangular frame out of PVC and then use silicone glue to attach a nylon window screen to the frame. I could sink the contraption in shallow water, put food on top, wait for the fish, and then pull the whole thing up. Any thoughts?