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KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Light microscope footage of Trichodina pediculus ciliates moving over the skin of a young roach fry (Rutilus rutilus). 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 in the Grand Canal in County Kildare, Republic of Ireland.
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