Living in South Florida, it was like living in an aquarium. Oscars became common in most canals. Pacu and an occasional Piranha have been caught on hook and line. Green mollies are native. There has been so many releases of fish that there are colonies of different types of cichlids all over the place. I used to catch Africans when I was trying to catch Largemouth Bass. I have also seen large Kissing Gouramis in canals. "It's all good... until somebody gets hurt." Our natural fauna has paid a high price with all these "intruders". I've been in FL for now 40 years this year and I've seen the change first hand. It's not good.
So let's not celebrate seeing these things outside their native areas. let's start collecting them and getting rid of them to restore native fish populations. Start getting a lot of tanks cause there's a lot of fish that need to be removed
Just my 2 cents.
On the other hand, I was privileged to be in Belize a number of years ago and saw Firemouth Meekis in their native waters. That was interesting. It was almost a commune of spawning beds. When I was in Brasil, we fished for and caught Pacu and some Geophagus to eat but I also saw some Tetras and other smaller fish (which I'm sure made it into the aquarium trade) in a small pond we were hiking around. It was an experience