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Aliivibrio fischeri is a non-pathogenic, Gram-negative, rod-shaped bacterium found globally in marine environments. This bacterium grows most effectively in water with a salt concentration at around 20g/L, and at temperatures between 24 and 28°C. Free-living A. fischeri cells survive on decaying organic matter. It is heterotrophic, oxidase-positive, and motile by means of a tuft of polar flagella. A. fischeri is found predominantly in symbiosis with various marine animals, such as the Hawaiian bobtail squid. A. fischeri also has bioluminescent properties controlled by the lux operon. The bacterium is a key research organism for examination of bacterial-animal symbiosis, microbial bioluminescence, and quorum sensing. It is named after Bernhard Fischer, a German microbiologist.
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