Fluorescent diffusible
pigment
Nonfluorescent diffusible
pigment
Nonfluorescent nondiffusible
pigment
Growth at 41ºC
Arginine dihydrolase
-
-
-
-
d
Gelatin hydrolysis
Starch hydrolysis
Urease
Esculin
Oxidase
Nitrates reduction
d
-
-
-
+
-
Pseudomonas anguilliseptica
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pseudomonadales, Family Pseudomonadaceae, Genus Pseudomonas,
Pseudomonas anguilliseptica
Wakabayashi & Egusa 1972.
Gram negative, motile (more intense at 15 -25 ºC) with monotrichous flagella,  0.4 x 2
μm  rods. Filamentous forms of 0.8 x 5-10 μm may be formed.
On solid medium: small (< 1 mm), round, regular, convex, grayish colonies.
May be hemolytic.  Aerobic, growth temperature 4-30 ºC. Do not grow at 37 ºC.
Media:Trypticase Soy Agar; Mueller-Hinton agar; Mac Conkey agar; Cytophaga agar.
Isolated from water & fish (Anguilla japonica, Anguilla anguilla).
Causes “red spot disease” in fish (eels) - petechial haemorrhages on the skin and internal organs. Pathogenicity is increased when
water temperature falls below 16 ºC. May be a cause of eye disease in Baltic herring.  Pathogenic to japanese eel, ayu, loach
(
Misgurnus anguillicaudatus) and blue-gill sunfish (Lepomis macrochirus).
Under laboratory conditions expressed low pathogenicity to rainbow trout, carp (
Cyprinus carpio), crucian carp (Carassius carassius),
and goldfish (
Carassius auratus).
  1. Wakabayashi H. & Egusa S.: Characteristics of a Pseudomonas sp. from an epizootic of pond-cultured eels (Anguilla japonica).
    Bulletin of the Japanese Society of Scientific Fisheries, 1972, 38, 577-587.
  2. Franck C.,  J. Berthe, Christian Michel, Jean-Franqois Bernardet : Identification of Pseudomonas anguilliseptica isolated from
    several fish species in France. DISEASES OF AQUATIC ORGANISMS, vol. 21: 151-155, 1995.
  3. Lars Lonnstrom, Tom Wiklund, Goran Bylund: Pseudomonas anguilliseptica isolated from Baltic herring Clupea harengus
    membras with eye lesions. DISEASES OF AQUATIC ORGANISMS, Vol. 18: 143-147.1994
Strains initially capable of hydrolyzing gelatin readily lost this property after
subculture. See tables.
(c) Costin Stoica
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