The two main limiting factors in aquaculture are oxygen and ammonia, plenty of the former and none of the latter.
If you have to feed your fish, you have more fish than your pond can naturally sustain. Imagine if all the lakes we fish, needed someone feed to feed the fish. Feeding your fish is one of the top contributors to "nutrient pollution" and algae growth is the number one sign of nutrient pollution.
In the end, you have to decide, do you want a pond you have to manage and turn into a chemistry experiment or do you want a natural ecosystem?
A pond is an unnatural BOW to begin with. If nature wanted a pond in that spot, it would have created one.
"Natural" is in the eyes of the beholder. I have "natural" all over the back side of my place. Briars, weeds, trees, sticker vines, itch weed, poision ivy, etc. The last thing I want my pond to be is "natural". I want it unnatural. I want it pleasant.
