The Potomac dumps into the Chesapeake Bay, which dumps into the ocean. These things multiply and are very, very hardy. Scary.
For a while this past summer, local news reports kept a count of the #'s caught in the river and other nearby, connected waterways.
And believe it or not, I've met folks at fish shops who've spoken very fondly about having them - and pirihanas!. Somthing about the "killer fish" folks seem to think is so cool. If they think so, more power to'm. Hopefully they don't anything stupid when the love affair wears off. And they find out they're tuff fish that might not easily die in there home tanks after a few years, or outgrow their tanks, or they get tired of having feeding them, or watching them devour stuff wears off.
But, they get tired of keeping them. Then, they get dumped into local waterways.
"Life may not be the party we hoped for but while we are here we might as well dance!"