Whirling Disease TAM

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Under a microscope, a Myxobolus cerebralis triactinomyxon looks like a grappling hook. At this stage, the parasite is ready to attach to a fish. When it does, three coiled springs in the tip (the dark portion on the right) shoot into the skin, providing a secure entrance route for the germ capsule.

Photo by Vicki Blazer, U.S. Geological Survey