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In vitro passages impact on virulence of Saprolegnia parasitica to Atlantic salmon, Salmo salar L. parr.

Songe MM, Thoen E, Evensen Ø, Skaar I - J. Fish Dis. (2013)

Bottom Line: The effect of serial in vitro subculturing on three pathogenic strains of Saprolegnia parasitica was investigated.Two of the strains declined in virulence after 15 successive in vitro subcultures, whereas one did not.It reveals that some strains degenerate more rapidly than others when subjected to successive in vitro subculturing on glucose-yeast extract.

View Article: PubMed Central - PubMed

Affiliation: Norwegian Veterinary Institute, Oslo, Norway.

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Gross lesions on the infected fish (a) an Atlantic salmon parr that got infected 3 days after being challenged with 5337AP. Note the cotton wool-like mycelial growth around the head. (b) 27365P primarily affecting the gills.
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fig07: Gross lesions on the infected fish (a) an Atlantic salmon parr that got infected 3 days after being challenged with 5337AP. Note the cotton wool-like mycelial growth around the head. (b) 27365P primarily affecting the gills.

Mentions: Infection was confirmed by typical gross changes where signs varied from cotton-wool-like tufts on the fins, head, integument and gills (Fig. 7), to focal areas of haemorrhage, necrosis and ulceration. Clinical signs included lethargy and loss of equilibrium in cases where the fish was seen swimming in circles almost above the water surface.


In vitro passages impact on virulence of Saprolegnia parasitica to Atlantic salmon, Salmo salar L. parr.

Songe MM, Thoen E, Evensen Ø, Skaar I - J. Fish Dis. (2013)

Gross lesions on the infected fish (a) an Atlantic salmon parr that got infected 3 days after being challenged with 5337AP. Note the cotton wool-like mycelial growth around the head. (b) 27365P primarily affecting the gills.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4263310&req=5

fig07: Gross lesions on the infected fish (a) an Atlantic salmon parr that got infected 3 days after being challenged with 5337AP. Note the cotton wool-like mycelial growth around the head. (b) 27365P primarily affecting the gills.
Mentions: Infection was confirmed by typical gross changes where signs varied from cotton-wool-like tufts on the fins, head, integument and gills (Fig. 7), to focal areas of haemorrhage, necrosis and ulceration. Clinical signs included lethargy and loss of equilibrium in cases where the fish was seen swimming in circles almost above the water surface.

Bottom Line: The effect of serial in vitro subculturing on three pathogenic strains of Saprolegnia parasitica was investigated.Two of the strains declined in virulence after 15 successive in vitro subcultures, whereas one did not.It reveals that some strains degenerate more rapidly than others when subjected to successive in vitro subculturing on glucose-yeast extract.

View Article: PubMed Central - PubMed

Affiliation: Norwegian Veterinary Institute, Oslo, Norway.

Show MeSH
Related in: MedlinePlus