Water Parasite (?) ID

[sselmrah]

Sorry if not the correct place to post this.
I found this thing in a water stream up in the Cedarberg mountains. I'd say about 8cm long and very thin, almost the width of a hair.
Some kind of parasite?

Link to video on youtube:
https://youtu.be/bMk9cDJ0ACU

Thanks

[Pjansen83]

Horsehair or Gordian worm. Harmless to people and animals

https://en.m.wikipedia.org/wiki/Nematomorpha

[Commander]

I really don't know anything about parasites, but that looks kinda like those parasites that invade grasshoppers and praying mantis and force them to water?

https://www.youtube.com/watch?v=Ap8Ts6lv_k0

Apparently called "horsehair worms".