Colonies are tan-coloured, smooth, shiny and convex with a spreading edge, 1.0-2.0
mm in diameter and are non-fluorescent. Violacein is not produced. Fuorescent
pigments are not produced. Growth temperature range is 25-40 ºC, 32 ºC optimum.
No growth at 15 or 45 ºC. Range of pH is 5.0-9.5, 6.0 optimum. Grows in 0-3.5%
NaCl. Good growth occurs after 48 h incubation on tryptone soy agar and nutrient agar
at 32 ºC. Aerobic; no anaerobic growth on medium supplemented with nitrate.
Haemolytic on 5% sheep blood agar.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Chromobacteriaceae, Genus Chromobacterium,
Chromobacterium aquaticum
Young et al. 2008.
Gram-negative rods, 0.3-0.5 x 1.5-2.0 μm. Motile by means of a single polar flagellum.
Poly-beta-hydroxybutyrate granules are not accumulated.
Isolated from spring-water samples collected from Yang-Ming Mountain, Taipei County, Taiwan.
Susceptible to cotrimoxazole, tetracycline, minocycline, nor/quinolones 2G, levofloxacin and nitrofurantonin.
Resistant to penicillin, gentamicin, erythromycin, clindamycin, fusidic acid, quinupristine-dalfopristine, coagoxacillin, oxacillin,
rifampicin, teicoplanin & vancomycin,
Undetermined.
  1. Young C., Arun A., Lai W., Chen W., Chao J., Shen F., Rekha P., Kämpfer P. 2008. Chromobacterium aquaticum sp. nov., isolated
    from spring water samples. Int J Syst Evol Microbiol 58(4):877-880 doi:10.1099/ijs.0.65573-0.
  2. Bajaj A, Kumar A, Yadav S, Kaur G, Bala M, Singh N, Mathan Kumar R, Manickam N, Mayilraj S. 2016. Isolation and
    characterization of a novel Gram-negative bacterium Chromobacterium alkanivorans sp. nov., strain IITR-71T degrading
    halogenated alkanes. Int J Syst Evol Microbiol 66(12):5228-5235 doi:10.1099/ijsem.0.001500.
  3. Euzeby (J.P.): List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int. J. Syst. Bacteriol.,
    1997, 47, 590-592. (List of Prokaryotic names with Standing in Nomenclature. http://www.bacterio.net).
Description is based on API 20 E, API 20 NE, API ZYM and Biolog GN-II tests.

Positive results for  arginine dihydrolase, alkaline and acid phosphatase, butyrate esterase (C4), caprylate esterase (C8), casein
hydrolysis, citrate utilization, esculin hydrolysis, gelatin hydrolysis, gamma-glutamyl transferase, lecithinase, lipase, leucine
arylamidase, alpha-chymotrypsin, naphthol-AS-B-1-phosphohydrolase, N-acetyl-beta-glucosaminidase, nitrate reduction to nitrite,
oxidase, tyrosine arylamidase, acid production from: fructose, glucose, myo-inositol & trehalose.
Can utilize: dextrin, glycogen, myo-inositol, alpha-ketoglutaric acid, methyl pyruvate, hydroxy-L-proline, L-alanyl-glycine, D-L-alpha-
glycerol phosphate, glucose, N-acetylglucosamine, potassium gluconate, capric acid, malic acid, trisodium citrate & phenylacetic acid.

Negative results for catalase (strain MTCC 11259 was reported positive by Bajaj et al.), alpha-fucosidase, alpha- and beta-
galactosidase, alpha- and beta-glucosidase, beta-glucuronidase, H
2S production, indole production, methyl red reduction, alpha-
mannosidase, ornithine decarboxylase, lysine decarboxylase, starch hydrolysis, urease, Voges-Proskauer test, valine arylamidase,
cystine arylamidase, trypsin, acid production from: adonitol, arabinose, cellobiose, dulcitol, galactose, inulin, lactose, melibiose,
mannitol, mannose, maltose, raffinose, rhamnose, salicin, sorbitol, sucrose & xylose.
No utilization of: D-arabitol, putrescine, L-leucine, gamma-aminobutyric acid, D-sorbitol, D-mannitol, beta–hydroxybutyric acid,
monomethyl succinate, glycyl-L-glutamic acid, bromosuccnic acid, L-alaninamide, L-threonine, L-phenylalanine, D-glucose-6-
phosphate, arabinose, mannose, mannitol, maltose & adipic acid.
Chromobacterium aquaticum
(c) Costin Stoica
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