Treating your water with Levamisole --> Follow

Notes from experience of treating the parasite,
some real time information from others as well as
pictures of their fish -> Follow

Link to original Camallanus article -> Follow

Link to technical information regarding Camallanus cotti -> Follow

Additional tech information found on

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A nice size (about an inch long, females Camallanus cotti)

These adult females produce dozens of microfilaria a day. Everything in the tank is infested
in a matter of days.

@PSNjizzcake I will use your video as an example of what fish keepers should look for to see their fish are infested with Camallanus Nematodes. The long string following the guppy is the mucus produced by the inflamed intestine of the infested fish. The real problem is the small red protrusion from the fish's anus. One can see them in the last few moments of the video. Those are female Camallanus Nematodes that are causing the irritation. Likely all the fish in the tank were infested and sooner or later would have died.

Levamisole is the only cure.