Prevalence of a single fish-pathogenic Saprolegnia sp. clone in Finland and Sweden

Thirty-one isolates of Saprolegnia sp., most originating from infected salmon or trout, were characterised genetically and physiologically. The majority (6 of 31) of the isolates from several widely separated geographical locations was found to be genetically almost identical as assessed by RAPD-PCR...

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Bibliographic Details
Published in:Diseases of aquatic organisms 2003-01, Vol.53 (1), p.47-53
Main Authors: BANGYEEKHUN, Eakaphun, PYLKKÖ, Päivi, VENNERSTRÖM, Pia, KURONEN, Henry, CERENIUS, Lage
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
DNA - analysis
Finland - epidemiology
Fish Diseases - epidemiology
Fish Diseases - microbiology
Fish Diseases/epidemiology/microbiology
Fundamental and applied biological sciences. Psychology
Fungi
Microbiology
Mycology
Oomycetes - classification
Oomycetes - genetics
Oomycetes - isolation & purification
Oomycetes - pathogenicity
Oomycetes/classification/genetics/isolation & purification/pathogenicity
Pathogenicity, host-agent relations, miscellaneous strains, epidemiology
Phylogeny
Prevalence
Random Amplified Polymorphic DNA Technique - methods
Random Amplified Polymorphic DNA Technique - veterinary
Random Amplified Polymorphic DNA Technique/methods/veterinary
Salmon - microbiology
Saprolegnia
Sweden - epidemiology
Trout - microbiology
Virulence
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Description
Summary:Thirty-one isolates of Saprolegnia sp., most originating from infected salmon or trout, were characterised genetically and physiologically. The majority (6 of 31) of the isolates from several widely separated geographical locations was found to be genetically almost identical as assessed by RAPD-PCR. The remaining isolates belonged to 3 different groups with 1 to 3 representatives each. It is suggested that the first group of isolates represents a virulent form of the organism that has been widely spread by clonal propagation. The ability to repeated zoospore emergence, as an alternative to direct germination, seems to characterise specific Saprolegnia genotypes that may have adapted to certain hosts.
ISSN:0177-5103
1616-1580
DOI:10.3354/dao053047