The only wild population of fish is people in Florida releasing fish. I am not criticizing Florida, but they have lax laws that allow many invasive fish be kept. It is also the only place where cichlids or others can survive.
Here in California we have little runoffs which people may dump platys in. They are not invasive in any way. They can survive the chilly winters in San Diego. San Diego monitors what is put in their lakes. It is highly unlikely any tropical fish would survive in lakes, as there are bass and many predators to eat it, and it gets cold in winter.
The only thing that has a stable population is parrots. In Florida there are stable populations of 17 different parrots, plus more of other escaped birds that include exotic pheasants, finches, doves, and water fowl. There is no way of preventing that now, as they have stable populations. In Southern California we have a few small populations of parrrots and parakeets, and a small population of domestic ducks. They are not invasive in any way. I don’t think many people release their fish into the wild, and if they did, it would be highly unlikely it would survive.
Here in California we have little runoffs which people may dump platys in. They are not invasive in any way. They can survive the chilly winters in San Diego. San Diego monitors what is put in their lakes. It is highly unlikely any tropical fish would survive in lakes, as there are bass and many predators to eat it, and it gets cold in winter.
The only thing that has a stable population is parrots. In Florida there are stable populations of 17 different parrots, plus more of other escaped birds that include exotic pheasants, finches, doves, and water fowl. There is no way of preventing that now, as they have stable populations. In Southern California we have a few small populations of parrrots and parakeets, and a small population of domestic ducks. They are not invasive in any way. I don’t think many people release their fish into the wild, and if they did, it would be highly unlikely it would survive.