Parasite of the Golden Shiner

A new species of Myxosporidia (Sporozoa) is described. This parasite occurs in the corium below the scales of the golden shiner, Notemigonus crysoleucas (Mitchill) (Cyprinidae). The name Myxobolus notemigoni sp. n. is suggested and a description of the organism is presented. The parasite is of commercial importance since it detracts from the appearance and market value of its host, an important bait fish. In the course of surveying the diseases and parasites of the golden shiner, one of the prin- cipal bait fishes cultured in the United States, the authors encountered an apparently hereto- fore undescribed myxosporidian. The cysts of the parasite occur under the scales of the host and are readily observed. Among the 30,000 golden shiners which had been harvested from one pond, approximately 20% were infected. Morphology of the spore and the presence of