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Epistylis (a.k.a. Red Sore Disease)

Obvious symptoms include ulcers or cotton-like growths on the skin, scales and spine resulting in a red-colored lesion. Consequently, this disease is commonly known as "Red Sore Disease." In catfish the lesion will involve the spines and bones that underlie the skin of the head and pectoral girdle. This protozoan parasite has also been observed on eggs.


The ciliated protozoan Heteropolaria. This disease is found primarily in wild populations of scaled fish. Heteropolaria is primarily a free-living protozoan that lives on aquatic plants and is believed to be an opportunist. Outbreaks are most common in catfish and salmon that have been kept for prolonged periods in water high in organic content.


These protozoans are osmotically sensitive and cannot withstand an increase in the salinity. You can treat your fish with a 30 minute bath of 22 g/L marine salt (non-iodized Sodium chloride) or a continuous bath of 6 g/L. Alternatively, you can treat with Quick Cure for 3 days.

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