Gill myxosporeans on some Egyptian freshwater fish.

Seven new species of myxosporeans are described from gills of seven freshwater species of fish from Egypt. The annual developmental cycle of the gills involves a period of summer invasion, followed in the autumn by development of cysts (plasmodia + host capsule) and initiation of sporogenesis, completion of sporogenesis in the winter, and the release of spores in the spring.