But one TV show, which was hosted by Jeremy Wade entitled, River Monsters will show you that piranhas are not attracted by live creatures without the scent of blood.
Jeremy created an experiment by putting 100 red belly piranhas in a swimming pool. These piranhas have not yet claimed anything. In short, these are hungry piranhas.
The first thing that he did was to drop blood inside the pool to see how they would react if they smelled a blood. They went around the cloud of blood, but they could not sense any fresh meat. Then, Jeremy decided to put in a piece of meat.
Within seconds after putting the meat, one piranha attacked it, which attracted a couple of piranhas more.
But surprisingly, when Jeremy swam in the pool, but the piranhas ignored him. Not a single attack was made.
This only proves that these fishes will only strike if they sense a smell of blood.