photobacterium marinum photobacterium marinum photobacterium marinum is a gram-negative, oxidase and catalase positive, motile bacteria of the genus photobacterium. photobacterium marinum are commonly found in marine environment. s.i. paul et al. (2021) isolated, characterized and identified photobacterium marinum from marine sponges of the saint martin's island area of the bay of bengal, bangladesh. photobacterium marinum scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: vibrionales family: vibrionaceae genus: photobacterium species: p. marinum binomial name photobacterium marinumsrinivas et al. 2013 biochemical characteristics of photobacterium marinum colony, morphological, physiological, and biochemical characteristics of photobacterium marinum are shown in the table below. test type test characteristics colony characters size medium type round color creamy shape convex morphological characters shape rod physiological characters motility + growth at 6.5% nacl + biochemical characters gram’s staining – oxidase + catalase + oxidative-fermentative oxidative motility + methyl red + voges-proskauer – indole + h2s production – urease v nitrate reductase + β-galactosidase – hydrolysis of gelatin + aesculin v casein v tween 40 + tween 60 + tween 80 + acid production from glycerol + galactose + d-glucose + d-fructose v d-mannose – mannitol v n-acetylglucosamine v amygdalin + maltose v d-melibiose + d-trehalose + glycogen v d-turanose v note: + = positive; – =negative; v =variable (+/–)