I did follow the link to Chris Steelman's use of one; he had a few dozen GSF in a pail. It would take several hundred pails'-full to make a difference in a pond overrun with crappie.
I was thinking that probably the net is used as you mention, i.e. placed so that the fish swim into it. I could be wrong, but from my experience in fishing ponds/small lakes that have been overrun with tiny crappie, they generally fill the entire lake or pond, and I have a hard time imagining they're all going to swim right to that one very small area to facilitate their own capture.
I had very similar results in the two-acre pond that I stocked pike into, to what Dwight has in his ten-acre pond that has northern pike and has as long as he has owned it: very big bass and bluegill both, with no detrimental effects to either species. From Pond Boss:
http://www.bassresource.com/fish_biology/walleye-bass-perch.htmlEDIT: Chris Steelman's (Young Blood) efforts caught over 700 GSF/HBG. He felt, as his name was referenced, that the record should be clear.
