Lately misguided aquarists put things into waters in Florida or the Carolinas such as weatherfish. Florida provides nearly perfect tropical fish habitat, as the freshwater in Tampa naturally achieves the sought-after 74 degrees Fahrenheit. The snakehead, which looks like a snake's head grafted onto a mildly ornate fish, now gives fits to game and fish departments across the south. Snakeheads predate ferociously upon forage fish and baby game fish. It's a lesson similar to releasing rabbits in Australia, or appointing football coaches as principals of high schools.
The weatherfish now establishes itself throughout Florida waters. I think about the less than wise soul that first decided to interfere with the Florida ecosystem by planting exotics in the waterways. When I visit Miami, I love the way that exotic non-native cichlids thrive in every drainage ditch, but I know in my heart that colorful though they might be, they belong someplace else.
Game and fish departments live with a bit of sin, too. They introduce bass species outside their natural ranges, on the theory that a megabass trumps a local bass. I do not share that theory. Personally, I prefer sunfish in any event. I experience mixed feelings that I fish, because I love the way sunfish look. But until I'm willing to give up grilled salmon, I'll live with the ambiguity. I don't think fishing is wrong, really, but I do like the idea of fish unaffected by hooks.
I want people to stop releasing snakeheads and weatherfish into local waterways in any event.
Also, stop putting mosquito fish in foreign waters, where they interfere with local forage fish in distant lands. Finally, teach kids how to catch snakefish, and fry them deep in sunflower seed oil, serving them with hush puppies. In Asia, snakefish serve as a staple. I've never tried one. But I'd clean one if I caught it.