The definition of candiru differs between authors. The word has been used to refer to only Vandellia cirrhosa , the entire genus Vandellia , the subfamily Vandelliinae , or even the two subfamilies Vandelliinae and Stegophilinae. These smaller species are known for an alleged tendency to invade and parasitise the human urethra ; however, despite ethnological reports dating back to the late 19th century,  the first documented case of the removal of a candiru from a human urethra did not occur until , and even that incident has remained a matter of controversy. Candirus are small fish.
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Meet The Candiru: The Penis Probing Fish Of Your Nightmares
Wikimedia Commons The candiru fish, in an drawing. Of all of the beasts that prowl the Amazon , none is more feared by the locals than the candiru. A river monster feared even above the dreaded piranha; the candiru waits for its unsuspecting prey to step into the river before latching onto it. This little fishy packs a punch. Rather than go for an outward attack, the candiru implants itself inside the human body through a rather unusual entryway — the human penis. The fish swims up the penis into the urethra — upstream, which is an impressive feat for such a small fish — where it latches onto the walls with barbs. Removal can be very difficult, as the barbs face one direction only, and pulling on the fish only causes them to sink deeper into the walls of the urethra.
What is a penis fish?
The Amazon Basin harbors an amazing amount of biodiversity. Covering some 7 million square kilometers 2. Case in point: The Candiru. Sometimes, these organisms are humans. These spines extend into the host, lodging the candiru firmly in place.
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