Swedish men are being warned against any inclination for nude swimming after a new species of fish known for attacking testicles was discovered in their waters.
The Natural History Museum of Denmark issued an alert after they recently caught a pacu, a relative of the piranha with human-like chompers, in an eel trap in the Oresund Sound, the Local reported.
The aggressive freshwater fish are mostly found in the Amazon and are sometimes known as "ball cutters."
Henrick Carl, a fish expert told the publication that pacu bite when they are hungry and "testicles sit nicely in their not so big mouth.