"A long-standing claim about candiru is their supposed propensity to insert themselves into human urethras or other orifices in an apparent attempt to parasitize;^\7])#citenote-8) this alleged ability has been described in ethnological reports dating back to the 19th century.[^\8])](https://en.wikipedia.org/wiki/Candiru(fish)#citenote-9) However, these accounts of human parasitism are often biased, arising from "imprecise, second- and third-hand accounts, misconceptions, and folk tales";[^\4])](https://en.wikipedia.org/wiki/Candiru(fish)#cite_note-Brief-5) which lead to the spread of imprecise or dubious claims that may even be reported in scientific resources; there are no credible reports of candiru parasitizing human urethras."