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![A single parasite (Cyclochaeta) enlarged 150 diameters fizh1751.jpg A single parasite (Cyclochaeta) enlarged 150 diameters](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fizh1751.jpg?itok=ngjwo-m_)
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A single parasite (Cyclochaeta) enlarged 150 diameters. The mouth may be seen entering one side of the parasite as well as the gear shaped skeleton.Cyclochaeta is a complex single-celled parasite living on the skin and gills offish and causing a severe irritation. Epidemics among small fish are frequently caused by this parasite. (Image credit: NOAA Central Library Historical Fisheries Collection | Dr. Freddie Fish)