Edited: 99% certain it is fish lice.Is this an anchor worm? Trying to confirm before attempting to treat

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Hello all, this little guy has quite a large disc-like grey parasite hanging on his head with a central striped worm looking part. Included below is a photo plus an unlabeled illustration of what looks to be the same thing. I can easily quarantine this fish but assuming if one has it, the whole pond is exposed? I don’t know the lifecycle, but the only play I bought from recently was Play It Koi :(, though a few weeks before that I received plants from multiple sources.

Update: removed the lice from this little guy and also one from my big shubunkin’s tail fin. Other fish seem okay for now. Happy to hear any recommendations for treatment in a 300 gallon plus two small bogs heavily planted pond.
 

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I’ve not seen a case but it does look suspicious. If you saved the parasite you could send it to your state veterinary lab for ID and they can help you with a treatment plan. I’ve attached an article from FL about fish lice, and it mentions the eggs can be on plants. Now I need to go look at my fish more closely. :(
 

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