ornithinimicrobium tianjinense ornithinimicrobium tianjinense ornithinimicrobium tianjinense is a gram-positive, non-spore-forming, heterotrophic and strictly aerobic bacterium species from the genus ornithinimicrobium which has been isolated from a recirculating aquaculture system. ornithinimicrobium tianjinense scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: intrasporangiaceae genus: ornithinimicrobium species: o. tianjinense binomial name ornithinimicrobium tianjinenseliu et al. 2013 type strain b2cgmcc 1.12160jcm 18464