Abstract
Tetrahymenosis affects freshwater fish while scuticociliatosis or uronemiasis is a marine fish disease. In this discussion, the aim is to present some key information for both groups of parasites, but essentially, they have a similar pathogenesis, and hence are dealt with in one chapter. Tetrahymena corlissi is the pathogen causing tetrahymenosis, being a free-living, holotrich ciliate. In guppies, T. corlissi aggregates as a rim of parasites around the eye (spectacle eye), while in black mollies, white skin patches occur as excess mucus is produced in response to the large number of invading ciliates. Pathogenic scuticociliates include Uronema marinum, Miamiensis avidus, Pseudocohnilembus persalinus, and P. longisetus. Uronema sp. is pyriform and ciliated. U. marinum and U. nigricans are morphologically similar except that U. marinum is larger. In scuticociliatosis, the parasite's ability to invade host tissue is due to the producing of potent proteases that breakdown and digest host tissue proteins, and result in ulcerative hemorrhagic skin, fin, and muscle lesions.
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