Balance is a fickle thing. It might be in balance this week and out of balance next week. Mother nature doesn't like balance. It's a constant battle, like trying to keep a teeter totter horizontal.
For the size pumps you will need, you can buy thousands of 10"-12" trout. Then you have to figure in the electric and infrastructure for the pumps. How will you keep them from freezing in the winter?
I don't understand what you said: "as the stream comes to an end the width will come down just enough to have the pump pushing the water all the way to the pond"
The end of the stream at the pond? If the stream is just trickling into the pond, how will the trout swim up it?
