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KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Light microscope footage of the parasitic ciliate Trichodina pediculus. This round ciliate protist attaches to the gills, fins and skin of fish, as well as other aquatic organisms. It attaches to them with rings of cilia on its lower side. The mouth is on the upper side, away from the host, and it feeds mainly on aquatic bacteria. This specimen was found on a fry of a roach fish (Rutilus rutilus), in the Grand Canal in County Kildare, Republic of Ireland.
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