That is my guess. Actually, this is part of what's happening with the intensive commercial fishing. You go to a certain location and essentially try to fish out the fish in that particular location, but then they'll go to another place where they find a food source and an appropriate habitat for reproducing. They then can establish themselves in another location. Now, whether that sends them up other tributaries or what, I'm not certain, but—
On June 18th, 2012. See this statement in context.