Minnow population "holding up" a guess could be defined, and for sure the walleyes would be less of a drain on the population than reproducing smallies, but the introduction of predators is going to greatly reduce the overall minnow population. It will never be the same. But again, do you want to manage for the best minnow population or do you want to consistently grow big perch? Your perch could very well and most likely will stunt out down the road without a good predator against the little guys (you could be that predator if desired). Regardless of your minnow population, you need a predator.
