Are single cell ciliated protozoa
Reproduce by binary fission and occasionally by conjunction. They are leaf shaped and 30-70 micrometers and 30-50 micrometers wide. The ventral side has cilia while the the dorsal side does not. They like cold water 38-48°F. This is a fish parasite and often attacks in the early Spring when fish immunity is low. It will stay dormant until conditions are favorable.
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