Male skinny-dippers in Scandinavia are being warned about a fish infamous for eating testicles. The fish, which is known as Pacu, is native to South America.
The Pacu was found by a fisherman in the Danish/Swedish strait of Oresund, according to experts at the Natural History Museum of Denmark.
The Pacu is a vegetarian with a knack for crushing nuts with their powerful jaws and sometimes can mistake the male reproductive organs for nuts.
Meantime, the advice of the museum's experts is this: "Anyone choosing to bathe in the Oresund these days had best keep their swimsuits well tied".