a genus of myxozoan parasites in the class Myxosporea. Cause serious disease losses in free-living fishes.
invades cartilage in the head of fish without causing deformity or nervous signs.
causes whirling disease and twist disease characterized by tail chasing, black pigmentation of the tail and deformity, including sunken heads and twisted spines. The parasite invades and destroys skeletal discharge.
causes cysts in the gills, followed by dyspnea and death due to asphyxia.