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IFAS Circular# 920

Ichthyophthirius Multifiliis (White Spot) Infections in Fish

Ruth Francis-Floyd and Peggy Reed


Opening Paragraph:
Ichthyophthirius multifiliis is a ciliated protozoan which causes "Ich" or "white spot disease." This disease is a major problem to aquarists and commercial fish producers world wide. Ichthyophthirius is an important disease of tropical fish, goldfish, and food fish. The disease is highly contagious and spreads rapidly from one fish to another. It can be particularly severe when fish are crowded. While many protozoans reproduce by simple division, a single "Ich" organism can multiply into hundreds of new parasites. This organism is an obligate parasite which means that it cannot survive unless live fish are present. It is capable of causing massive mortality within a short time. An outbreak of "Ich" is an emergency situation which requires immediate treatment: if left untreated, this disease may result in 100% mortality. 

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