I'm not advocating he fertilize, as to be honest, I never do.
In a way, you are/do, but not the way you are thinking, and maybe not per se, but by what you are doing.
You are fertilizing most of your ponds now.
Feeding the fish is adding nutrients to the pond. The poorer the grade of food, the more passes through the fish, and more nutrients end up in the water. The nutrients that pass through the fish are a type of fertilizer.
Think of it as feeding your pet a good quality food vs. a poor quality grade of food. Now think of what the amount of poop you have to pick up after them is like.......
