Ick! I guess that's a common thing people might say about parasites. Turns out that there's one called that, though it's usually spelled "Ich", short for Ichthyophthirius multifiliis. These parasites are ciliates, and they cause skin lesions and other issues in fish and are a bane of tropical fish hobbyists and aquaculturists alike.
I know this disease from my fish tanks. Nice picture.
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