That tropical fish that swims up the urethra

[bibliophage]

Encyclopedia Britannica says:

candiru
(Vandellia cirrhosa), scaleless, parasitic catfish of the family Trichomycteridae found in the Amazon River region. A translucent, eellike fish about 2.5 cm (1 inch) long, the candiru feeds on blood and is commonly found in the gill cavities of other fishes. It is sometimes also parasitic to humans and has been known to enter the urethras of bathers and swimming animals. Once in the passage, it erects the short spines on its gill covers and may thereby cause inflammation, hemorrhage, and even death to the victim.

Note that no mention is made of the creature swimming up a stream of urine. That part may be a UL.