[Sphaerospora truttae (Myxosporidia) in Salmo trutta and Thymallus thymallus: first detection in Thüringia and in the Hartz region and also in the grayling].

S. truttae is described from brown trout and grayling in Middle Germany. This species is obviously not connected with PKX, the causative agent of Proliferative Kidney Disease (PKD) in salmonids. S. truttae, however, is important in this connection from the viewpoint of differential diagnostics.