If there's one, there are probably more, but hopefully not enough to establish a breeding population.
But that's probably wishful thinking, seeing as Viar caught one in May.
Reminds me of the Asian Snakefish issue. They are bountiful in the ponds/lakes in the city parks of South Philadelphia. Didn't take long, either.
Just keep an eye out for the Bull Sharks, which can tolerate fresh water, and have been found WAY up the Mississippi.
