Mysterious "cut egg fish"

Recently, a story has been circulating on Weibo: [Men's nightmare in the Swedish Strait - the "Ball Cutter Fish"] According to the UK's Daily Mail, a 21cm long piranha was spotted in the Oresund Strait between Denmark and Sweden. However, this type of fish has a particular preference for biting human testicles, hence its nickname, the "Ball Cutter Fish". The local government has already warned Swedish men to avoid any form of nude swimming in this area to prevent tragedies.

In fact, this is an old picture. According to its photographer, Pedro Luspenya, it was taken in Brazil, the original habitat of the freshwater Pacu fish, in 2005, used to introduce the Pacu fish.

Although there are occasional reports of attacks by Pacu fish on humans, in natural environments, these fish rarely attack humans, usually only when food is scarce or they are frightened. Some people have analyzed that they might mistake human testicles for nuts, thus becoming the "demon" that cuts balls.