I think what we all need to be missing, is these are not natural lakes.. so, anything in the lake was placed there to begin with.. Any fish, native or not wasn't there to start. It was probably stocked by a facility, the way that bass and trout are stocked here up north. The fish they are "wiping out" are probably a dime a dozen. So why not leave them be? OR leave 1 lake and put all the plecos in there, and they will eventually beat eachother out.
Here in the south, you don't have to stock a pond or lake in order for it to become populated with native fish. It mysteriously happens on its own. People say eggs travel on the feet of birds. Anyway, fish are stocked in streams and rivers alot up north because of damming. The fish can't spawn because the damn prevents them from traveling upstream to the spawning site. The fish would exist even if they weren't stocked, but there wouldn't be enough to make fishing any fun and tourism would suffer. I often see you presenting uneducated statements as fact, and it only leads me to further believe that you enjoy trolling for a good argument.