Query: NC_011184:325797 Vibrio fischeri MJ11 chromosome I, complete sequence Lineage: Aliivibrio fischeri; Aliivibrio; Vibrionaceae; Vibrionales; Proteobacteria; Bacteria General Information: This strain was isolated from a pinecone fish, Monocentris japonica, light-emitting organs in Japan. This genus is abundant in marine or freshwater environments such as estuaries, brackish ponds, or coastal areas; regions that provide an important reservoir for the organism in between outbreaks of the disease. Vibrio can affect shellfish, finfish, and other marine animals and a number of species are pathogenic for humans. This organism is found in marine environments and was originally named by Bernard Fischer during a sea voyage in the 1800s. It is a symbiont in fish and squids and is responsible for light generation in those organisms, which use it as a defense mechanism to avoid predators.
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General Information: This strain was isolated from a culture of the dinoflagellate Pfiesteria piscicida CCMP1830 which has been implicated in many large scale algal blooms resulting in increased mortality in fish. The bacteria are attached to the surface of the dinoflagellate and in some ways allow the dinoflagellate to grow as those lacking the bacteria die off. The bacterium also chemotaxes towards the dinoflagellate product DMSP (dimethylsulfoniopropionate) and metabolizes it. DMSP is a major source of sulfur in marine ecosystems and plays a role in the sulfur biogeochemical cycle. The implication is a tight association between these important dinoflagellates and this marine bacterium.