Luminescent bacteria with fish create mutualistic facultative or obligatory associations from which both species benefit. Bacteria in the association recive the protection and nutrients needed for growth and development, while fish recive light that they use for the purpose of defending themselves from predators, attracting prey and intraspecific signaling. This paper describes associations that luminescent bacteria create with fish of the family Anomalopidae and Leiognathidae and the order Lophiiformes. Fish of the family Anomalopidae have a suboccular light organ that contains bacteria that are in a obligatory association with the host fish. Species of the order Lophiiformes are also in obligatory association with luminescent bacteria but their light organ is located on the head area. Fish from family Leiognathidae are in a facultative relationship with luminescent bacteria, and store them in a light organ that surrounds the esophagus.