What common occurrence today is responsible for the global presence of the X-Ray Tetra outside of South America?

Answer

The international ornamental fish trade

The current global presence is almost entirely due to the international ornamental fish trade, meaning specimens are typically wild-caught from native locales or captive-bred globally.

What common occurrence today is responsible for the global presence of the X-Ray Tetra outside of South America?
locationhabitatanimalfishTetra