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    Thread: Red cysts on butterfly tails

    1. #1
      milehighkoi is offline Junior Member
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      Feb 2021
      Denver, CO

      Red cysts on butterfly tails

      Hi Koiphen,

      I've been chasing these lumps that develop on my koi's tails for months. They last a long time, at least multiple weeks, and only seem to appear on butterfly fins, typically near the base of the tail. Initially, I thought they were juvenile anchor worms, so I treated the pond for those. However, I've never found an adult anchor worm, and despite a few rounds of Dimilin X I still find these lumps, so I guess it must be something else. Any ideas?

      Attached are some photos, some attained after significant struggle. If there's an etiquette for number of photos that I'm violating, I apologize!
      Attached Images Attached Images      

    2. #2
      RichToyBox's Avatar
      RichToyBox is offline Administrator ~
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      Feb 2005
      Sandston, VA
      I would still say it was encysted juvenile anchor worm and due to the colder temperatures, it may take a couple of more months for them to develop enough to come out of the encysted state to a place that will allow the treatment to kill them. Continue the Dimilin through spring.

      "Our goal is to assist with emergency and Koi health issues, as well as educate on best practices. Please help us gain a clear picture by giving the original poster time to answer our questions before offering opinions and suggested treatments."

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