A Danish fisherman made an unusual find in his nets recently when he discovered a pacu, a sharp-toothed cousin of the South American piranha with a reported penchant for testicles.

"If they bite, they can bite hard ... especially when they bite you where you really don't want to be bitten," joked fish expert Peter Resk Moeller of the Natural History Museum of Denmark.

However he said that the pacu is not a meat-eater and normally does not attack people.
...read more here: Testicle biting fish found off Denmark