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<i>Vibrio fischeri</i> is a common gram-negative,
 rod-shaped bacterium found globally in


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marine environments and that belongs
 to the Vibrionaceae family.


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It is named after Bernhard Fischer, 
a German microbiologist.


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 <i>Vibrio fischeri</i> has bioluminescent 
properties and is found predominantly


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 in symbiosis with various marine animals 
such as the Hawaiian bobtail squid.


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 It is heterotrophic, oxydase-positive, and
 motile thanks to a tuft of polar flagella 


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which is formed by one to five flagellar
filaments. Free-living <i>Vibrio fischeri </i>cells


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 survive on decaying organic matter. 

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The genome of <i>Vibrio fischeri</i> has been
 fully sequenced and is 4.2 MB in length.


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It is organised in two chromosomes
 and usually some additional plasmids.


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 This bacterium colonizes various marine
 niches, including the seawater column 


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and marine sediments. One exceptional
 feature of this bacterium is its ability to 


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colonise hosts like the small squid 
<i>Euprymna scolopes</i>: when associated with 


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its host, <i>Vibrio fischeri</i> produces light,
 which makes the whole animal luminescent. 


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The bacterium is a key research organism
 for the study of microbial bioluminescence,


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quorum sensing, and bacterial-animal 
symbiosis, and in the following videos 


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you will see exactly what makes <i>Vibrio </i>
<i>fischeri</i> an exceptional model for the


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 study of these phenomena.