Phylum Proteobacteria, Class Gammaproteobacteria, Order Aeromonadales, Family Aeromonadaceae, Genus Aeromonas,
Aeromonas eucrenophila Schubert and Hegazi 1988 emend. Huys et al. 1997.
Strains of Aeromonas eucrenophila subgroup II are included in Aeromonas encheleia species.
Strains of Aeromonas eucrenophila-like are now Aeromonas tecta.
Gram-negative rods with rounded ends to coccoid 1.0-4.4 µm in diameter,
occasionally forming filaments up to 8 µm long. Occurs singly, in pairs or in chains.
Motile, usually by one polar flagellum.
Facultatively anaerobic. Grows on a mineral medium with ammonia as the sole
source of nitrogen and one of the following as the sole source of carbon: D-glucose,
arginine, asparagine, or histidine. No brown water-soluble pigment is produced.
Hemolysis on sheep blood agar is variable (4 of 9 strains). Mesophilic, 0-5 to 37 ºC,
optimum growth temperature 30 ºC. No growth at 40 ºC. Incubation at 20 ºC is best for
some tests. Can grow in nutrient broth with: 0 and 3% NaCl, but not in the presence of
6, 8, or 10% NaCl. Can grow in pH 5.5-9.0 media.
Isolated from unpolluted surface and groundwater, streams and clean well waters. Resistant to vibriostatic agent O/129, amoxicillin,
ampicillin, cefetamet, oxacillin, penicillin G, teicoplanin & vancomycin.
- Geert Huys, Peter Kämpfer, Martin Altwegg, Renata Coopman, Paul Janssen, Monique Gillis, and Karel Kersters. Inclusion of
Aeromonas DNA Hybridization Group 11 in Aeromonas encheleia and Extended Descriptions of the Species Aeromonas
eucrenophila and A. encheleia. Int J Syst Bacteriol October 1997 47:1157-1164.
- Amy Martin-Carnahan and Samuel W. Joseph 2004. Order XII. Aeromonadales ord. nov. In: Bergey’s Manual of Systematic
Bacteriology, Second edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp. 556-587.
Positive results for catalase, oxidase, nitrates reduction, indole production, ONPG, growth in KCN medium, acid production from:
maltose, D-mannitol, mannose & D-trehalose.
Negative results for urea hydrolysis, citrate utilization, malonate utilization, Voges-Proskauer test, lysine decarboxylase, elastase,
ornithine decarboxylase, acid production from: adonitol, D-amygdalin, D-arabitol, dulcitol, erythritol, inositol,
alpha-methyl-D-glucoside, melibiose, D-raffinose, D-sorbitol & D-xylose.
Variable results for esculin hydrolysis, acetate utilization, gelatin hydrolysis, arginine, dihydrolase, DN-ase, lipase (corn oil), H2S
production from cysteine thiosulphate, acid production from: L-arabinose, cellobiose, lactose, D-glucose (with gas production),
glycerol, L-rhamnose, salicin & sucrose.
(c) Costin Stoica