I live in WI and a biologist told me to get a fish farm license through the USDA. Cost $50 per year. Glad I had it, shortly after stocking the pond a warden stopped and asked me for my fishing license and asked me if I had gotten a permit for stocking. When I told him no, I was a licensed fish farmer and would show him the certificate he said "oh you're one of those guys. your not on my list, have a nice day" and left.
