This Wikipedia entry describes Vibrio fischeri, a rod-shaped bacterium found globally in marine environments. This bacterium has bioluminescent properties, and is found predominantly in symbiosis with various marine animals, such as the Bobtail squid. The bacterium is a key research organism for examination of microbial fluorescence and bacterial-animal symbiosis. The article includes a scientific classification, list of pseudonyms, and links to related resources.