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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Mycobacterium marinum
Category: Zoonotic
Etymology: Genus name: small fungus-like rod.
Species epithet: from the sea.
Significance:  [Of minor importance]   
Type Strain: ATCC 927 = CCUG 20998 and 27843 = NCTC 2275.
Macromorphology (smell):
Micromorphology: Acid-alcohol-fast long rods. It has been reported that M. marinum can form endospores. This finding is, however, controversial (see references 105 and 106 below) and has not been verified.
Gram +/Gram -:G+ (but difficult to gram stain)
Metabolism: Aerobic-
Other Enzymes: Urease +.
Spec. Char.: M. marinum is a slow grower (it takes more than 7 days to see colonies with the naked eye).Generation time: 6-11 h. Photochromogenic. Optimal growth temperature: 33°C.
Disease:Intracellular granulomatous disease in fish. Swimming pool granuloma in humans.
Hosts: Fish, frogs and other poikilothermic animals. Can cause skin lesions in humans.
Clinical Picture:
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_010612 ATCC BAA-535 6 636 827 1c + 1c 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF456240 (T) 1522 

About 175 species have been described within genus Mycobacterium and this genus is closely related to Rhodococcus, Nocardia and Corynebacterium. M. marinum is very closely related to M. ulcerans.
Comment:M. marinum can produce a yellow photochromogenic pigment in contrast to M. ulcerans.
Reference(s): No. 72, 105, 106


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