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Sporozoon Tincae Volf & Dvořak, 1928, is the cause of a fatal disease of the tench (Tinca tinca) in fish-ponds in south Bohemia. We can distinguish in its life cycle two different stages, multiplication by repeated binary fission, resembling schizogony and by sporogony with the formation of elliptical spores measuring 1.5–2 by 0.5–1 μ. The development of all these stages occurs in the cytoplasm of histiocytes. A detailed description of the life cycle is given. This parasite should be placed provisionally in the order Haplosporidia.