Ok, first this is not for a commercial venture so I will not be counting pennies.
I have a 1/2 hp pump, I have close power, I have some pvc laying around. Could I set up a 600 gallon tank, freestanding with an inflow from the pump, let gravity feed the outflow, and just rely on the pond to be my filter? In other words, pump pond water into a tank, let it flow back into the pond, and grow fish out? Obviously using feed. I was thinking about tilapia, i have plenty in my pond. How long does it take to grow a fish out?
Maybe a little sophmoric but just thinking about a weekend project. If it failed I would not be out anything but elbow grease. Unless its doomed from the start by something I am not thinking about.
Toby
