I agree with Bill. You can easily get to a point (very fast) where introducing another predator species will both inhibit growth of the walleye and just deplete the forage base so quickly, the existing population of Both Predator and Prey suffer. If conditions are right, a few could be introduced but generally speaking to make this work in your favor, it about requires a "restart" from the beginning. It needs to be planned for. Walleye can be used as a tool to manage certain species, but certain conditions would need to be present to benefit. My 2 cents..
