Here's an idea that I learned from my grandfather many years ago. I haven't seen this concept used very much since then. Its basically a fish hoist as illustrated below. The top ring is a floating ring that you throw the fish feed into. about 1 foot below is a slightly larger non floating ring with net attached. You train the fish to get comfortable feeding from the top ring then you can quickly lift the net and catch them from the bottom up. As 10 year old it amazed me that you could catch enough fish to feed 4 or 5 people in the span of 5 minutes. It was also not terribly disruptive, the fish resumed feeding shortly after.
It works best in an area like the corner of a dam or dock where you can walk a perimeter to rotate the fish load to the bank. The other tip is to have the center point a metal pipe with the Y being loosely fitted into the pipe so that it will rotate.
