Oodinium
Definition:
Oodinium are microscopic ectoparasite of freshwater fish that produces the condition known as "velvet disease", usually fatal if not treated. A heavily infested fish will look as if it has been dusted with whitish or yellowish powder.
Also Known As: Velvet disease
Oodinium are microscopic ectoparasite of freshwater fish that produces the condition known as "velvet disease", usually fatal if not treated. A heavily infested fish will look as if it has been dusted with whitish or yellowish powder.
Also Known As: Velvet disease
Source...