Candiru Fish Creepier Than Piranha ?

In Amazon River , Candirus are small fish. Adults can grow to around 40 centimetres (16 in) with a rather small head and a belly that can appear distended, especially after a large blood meal. The body is translucent, making it quite difficult to spot in the turbid waters of its home.

In fact, the candiru is among the tiniest vertebrates on the planet, and it is sometimes referred to as the "toothpick fish" due to its small size and slender shape .

This creature is a parasite, humans are not among its viable hosts. It lingers in the murky darkness at the river's bottom, quietly stalking its neighboring fish. Light is scarce in the soupy deep, but the candiru does not need to see... But it abillity to swims up to urine steam makes creepier than piranha .  It can taste the traces of urea and ammonia that are expelled from breathing gills.

When the candiru successfully invades a human, it proceeds exactly as it would with a fish host. After entering the misidentified orifice, it quickly wriggles its way in as far as possible, often accompanied by the victim's frantic attempts to grip the slippery, mucus-coated tail. In the unlikely event that the panicked victim manages to grasp the fish, its backwards-pointing barbs would cause excruciating pain at each pull, and bring a quick end to the dramatic tug-of-war. 

Once inside, the parasite inches its way up the urethra to the nearest blood-gorged membrane, extends its spines into the surrounding tissue, and starts feasting.

Though such brushes with the candiru are exceedingly rare in statistical terms,surgery only option to break the pain. It is wise to heed the advice of the locals, and avoid urinating in the Amazon River at all costs. Once you ignore the locals,It'll bring death on you  .