John, you have a beautiful pond. I don't see a fish listed as stocked that will eat any FA other than incedentally while consuming other foods. None listed are capable of digesting and extracting any nutrient value from algae. Whatever the reason your pond is FA free is great news, I just don't see any correlation between the lack of FA and fish stocked in this case.
I would suspect you have a low phosphorus inflow and a healthy plant diversity in your pond as the main factors for low algae production in you pond.
