|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.|
|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)|
|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.|
|16S rRNA Seq.:|
||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|