The marron (Cherax tenuimanus) is one of the few species of freshwater crayfish native to Australia that is suitable for aquaculture and occurs only in the southwest of Western Australia. This study describes polymorphic microsatellite markers which differentiate marron populations from several geographically distinct regions (including rivers and streams, dams, and commercial marron farms) throughout Western Australia. Twenty microsatellite loci, primarily of the (CA)n. (GT)n type, were isolated and sequenced from a marron cosmid library. Three of these loci were characterised further. Two loci exhibited extensive polymorphism and one was monomorphic. The polymorphic loci exhibited Mendelian codominant inheritance in the family group comprising two individual parents and approximately 100 offspring bred for this study. These loci permitted differentiation between the five geographically distinct populations studied and thus provide a basis for genetic characterisation of marron stock in Western Australia.
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