I credit the few female NP in our 5 acre pond with improving the overall health of the pond's fish population.
We have many species in many sizes and they all continue to reproduce and thrive. I think different

and apparently our pond is different; it all works in harmony here.
I know that a 40" NP will eat a lot and 1 of those in a 1/4 acre pound would become lonely pretty fast.
I am not so sure they belong in that small of a pond. Maybe one?