piscirickettsiaceae piscirickettsiaceae the piscirickettsiaceae are a family of pseudomonadota. all species are aerobes found in water. the species piscirickettsia salmonis is a fish pathogen and causes piscirickettsiosis in salmonid fishes. it lives in cells of infected hosts and cannot be cultured on artificial media. piscirickettsia salmonis is nonmotile, whereas the other five genera are motile by using a single flagellum. piscirickettsiaceae scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: thiotrichales family: piscirickettsiaceaefryer and lannan 2005 genera cycloclasticus galenea hydrogenovibrio methylophaga piscirickettsia sulfurivirga thiomicrorhabdus thiomicrospira thiosulfatimonas thiosulfativibrio