Journal
DISEASES OF AQUATIC ORGANISMS
Volume 53, Issue 1, Pages 47-53Publisher
INTER-RESEARCH
DOI: 10.3354/dao053047
Keywords
Saprolegnia; saprolegniosis; fish disease; random amplification of polymorphic DNA RAPD repeated zoospore emergence
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Thirty-one isolates of Saprolegnia sp., most originating from infected salmon or trout, were characterised genetically and physiologically. The majority (6 of 3 1) 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.
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