Edwardsiella piscicida
Pathogenicity
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacterales, Family Hafniaceae, Genus Edwardsiella, Edwardsiella
piscicida
Abayneh et al. 2013.
Gram-negative rods.
Colonies on blood agar after 24 h of incubation at 30 ºC are pin-point, circular, slightly
convex, smooth and glistening with slight beta-haemolysis visible only under the
colony. Optimum temperature for growth is 28–30 ºC. Growth can occur at 25 and 37
ºC but not at 12 or 42 ºC. Growth occurs at 1-5%
NaCl but not at 6% or above.
Facultatively anaerobic.
Isolated from diseased fish.
Pathogenic for zebra fish.
  1. T. Abayneh, D.J. Colquhoun, H. Sorum. Edwardsiella piscicida sp. nov., a novel species pathogenic to fish. J. Appl. Microbiol., 114,
    644-654.
  2. J. G. Holt et al., 1994. Facultatively Anaerobic Gram-Negative Rods. Subgroup 1. Family Enterobacteriaceae. In: Begey’s Manual of
    Determinative Bacteriology, 9th-edition, Williams & Wilkins, pp175-189.
  3. Adeolu M, Alnajar S, Naushad S, S Gupta R. Genome-based phylogeny and taxonomy of the 'Enterobacteriales': proposal for
    Enterobacterales ord. nov. divided into the families Enterobacteriaceae, Erwiniaceae fam. nov., Pectobacteriaceae fam. nov.,
    Yersiniaceae fam. nov., Hafniaceae fam. nov., Morganellaceae fam. nov., and Budviciaceae fam. nov. Int J Syst Evol Microbiol
    2016; 66:5575-5599.
Positive results for catalase, lysine decarboxylase, malonate utilization, nitrate reduction, ornithine decarboxylase, acid production
from: maltose, mannose and glucose (usually with gas production).

Negative results for arginine dihydrolase, citrate utilization (Simmons), DN-ase, esculin hydrolysis, gelatinase, beta-galactosidase,
beta-glucuronidase, lipase (Tween 80), oxidase, L-pyrrolidonyl aminopeptidase, phenylalanine deaminase,growth in KCN medium,
urease (Christensen), Voges-Proskauer, acid production from: amygdalin, adonitol, D-arabitol, alpha-methyl-D-glucoside,
D-cellobiose, dulcitol, inositol, lactose, melibiose, raffinose, L-rhamnose, D-sorbitol and D-xylose.

Variable resultsfor degradation of Tween 80, L-fucose, D-galactose, maltose, D-mannose, bromosuccinic acid,
glucoronamide,L-asparagine, L-aspartic  acid, L-glutamic  acid, glycyl-L-glutamic acid, glycyl-L-aspartic acid, L-serine, uridine,
glycerol and D,L-alpha-glycerol phosphate.

E. piscicida can only be differentiated from E. tarda by degradation of alpha-methyl-D-glucoside, citric acid and L-proline.
(c) Costin Stoica
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R E G N U M
PROKARYOTAE
Legend:  + positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains
 
Hydrogen
sulfide (TSI)
Methyl red
Indole
production
L-Arabinose
fermentation
D-Mannitol
fermentation
Sucrose
fermentation
Trehalose
fermentation
E. tarda / E. piscicida
+
+
+
-
-
-
-
E. tarda biogroup 1
-
+
+
+
+
+
-
E. hoshinae
+
+
d
[-]
+
+
+
E. ictaluri
+
-
-
-
-
-
-
Differential characters between Edwardsiella species:
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