Flesh-Eating Freshwater Fish
The Violet Candiru is a freshwater fish that is actually more aggressive than piranhas. This fish is sensitive to the ammonia scent of animals, which it uses to locate and attack its prey. Human urine is no exception, and urinating in the water can even be fatal.
A particularly famous incident involves the casualties from the sinking of the Santos. As passengers swam to evacuate, schools of Violet Candiru attacked, leading to many deaths. It is said that the cause was not direct predation, but rather shock or infection caused by their entry into the body.
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