Now, I don’t want anyone to get nervous but you know how different species travel the globe . . . All it will take is some sailor to think they is fresh water guppies and bring them to the U.S. and the water won’t be safe for nothing but women.
The subject story discusses that folks in Scandinavia, men specifically should not skinny-dip in local waters as the Pacu from South America has been found locally and they might eat exposed testicles. Folks, I couldn’t make this stuff up on a bet. This is a true story.
Anyway, somehow the South American relative of the Piranha has been brought to Scandinavian waters and possibly decided to set up home there. Thus the big toothed critter is a threat to anyone exposing a male testicle as the Pacu like to crush nuts with their teeth. Again folks, I cannot make this stuff up!