The Piscirickettsiaceae are a family of Proteobacteria. All species are aerobe and found in water. The species Piscirickettsia salmonis is a fish pathogen bacteria and causes Piscirickettsiosis in salmonid ﬁsh . It lives in cells of infected hosts and can´t be cultured on artiﬁcial media.Piscirickettsia salmonis is non-motile, whereas the other five generas are motile by using a single flagellum.
^Martin Dworkin, Stanley Falkow, Eugene Rosenberg, Karl-Heinz Schleifer, Erko Stackebrandt: The Prokaryotes, A Handbook of the Biology of Bacteria. Volume 5: Proteobacteria: Alpha and Beta SubclassesISBN 978-0-387-25495-1