I have talked with our biologists about them. So far we haven't had any here in Vt but like all other invasive species they seem to find their way into other bodies of water.This particular fish has the ability to migrate from one body of water over short pieces of land to an adjacent stream thereby going from one lake or pond to another. Most places in southern NY state where they have showed up were killed off with roetenone along with every living fish in that body of water. After the pond or lake was fish free they can stock and re-establish the native fishery. These invasive fish are one of the most feared by biologists. They often start from some brain dead person emptying their aquarium into a body of water. You can't catch them all to eliminate them. They reproduce too fast to eliminate them and they eat voraciously so growth rate is phenomenal..