Swimmers warned of testicle-biting fish

Male skinny-dippers -- or those who swim in the nude -- are being warned about a fish in Scandinavia that bites testicles, a media report said Sunday.

The Pacu, native to South America, was found by a fisherman in the Danish-Swedish strait of Oresund, CNN reported citing experts at the Natural History Museum of Denmark.

The fish has big teeth and looks menacing.

Though the Pacu's large teeth are not as sharp as that of the piranha, they are fully capable of severing fishing lines and fingers, the museum's experts said.

Even though experts say the Pacu is vegetarian, the fish love crushing nuts with their powerful jaws and sometimes can mistake the male reproductive organs for their favourite snack, CNN said.

As to how the fish ended up in Scandinavian waters is a bit of a mystery, the museum said.

The museum experts have advised swimmers to "keep their swimsuits well tied".