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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Edwardsiella ictaluri
Etymology: Genus name: named after the American bacteriologist P. R. Edwards (1901-1966).
Species epithet: refers to catfish (genus Ictalurus).
Significance:Har betydelse i de länder där man odlar dvärgmal, t.ex. USA, Australien och Thailand. Sjukdomen har aldrig påvisats i Sverige.
  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Enterobacteriales
Family
Enterobacteriaceae 
Genus
Edwardsiella
Type Strain: SECFDL (Southeastern Cooperative Fish Disease) Laboratory) GA 77-52 = ATCC 33202 = CCUG 18764 = NCTC 12122.
Macromorphology (smell):
Micromorphology: Nonmotile short rods (0.8 x 1-3 µm).
Gram +/Gram -:G-
Metabolism: Facultatively anaerobic
Catalase/Oxidase:?/-
Other Enzymes: DNase -, esculinase -, ornithine decarboxylase v, tryptophanase - (cf. E. tarda), urease -.
Biochemical Tests: Citrate -, hydrogen sulfide v, methyl red -, Voges-Proskauer -
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+-+--
L-arabinosecellobioseD-mannitolsalicintrehalose
-----
glycerolinulinraffinoseD-sorbitolstarch
-?--?
All strains ferment glucose under acid production and half of the strains also under gas production.
Spec. Char.: Does not grow at 42°C (cf. E. tarda).
Disease:"Hole in the head disease".
Hosts: Fish of the genus dwarf catfish, especially channel catfish (Ictalurus punctatus).
Clinical Picture: Spot formed bleeding in the oral cavity, throat, abdomen and at the bases of the fins.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_012779 93-146 3 812 315  1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
AB050826 JCM1680T? 1 466 99.86-100% 

Taxonomy/phylogeny:
 
Four species have been described within the genus Edwardsiella. These bacteria belong to the familyEnterobacteriaceae and they are relatively closely related to bacteria within the genera Morganella and Proteus.
Updated:2018-05-03

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