Piranhas had become accustomed to the free food discarded in the river. Once first blood was drawn, the school attacked en masse.
A school of piranhas attacked holiday makers playing in a stream in a Brazilian resort on May 1, leaving at least eight people injured.
Experts think the biting frenzy was a case of"mistaken identity" and that the piranhas were actually after the food that visitors at local restaurants sometimes throw into the river. Some piranha species, including the red-bellied piranha , engage in collective feeding frenzies."Species of the genus Pygocentrus, that occur in the Amazon and São Francisco river drainages, are most dangerous," Paulo Andreas Buckup , an ichthyologist and professor at the National Museum of the Federal University of Rio de Janeiro in Brazil, told Live Science in an email.
The presence of bathers in a feeding spot, however, can lead to confusion and aggression."Feeding piranhas in a tourist setting strengthens their natural behaviors to school and bite," Mark Sabaj Perez , an ichthyologist at the Academy of Natural Sciences of Drexel University, Philadelphia, told Live Science in an email.
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