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Gyrodactylus specimens infecting the skin and fins of two alpine bullhead (Cottus poecilopus) populations from the rivers Signaldalselva (North Norway) and Rena (South-East Norway) were characterized by both morphological and molecular means. Morphometrical differences were minor and the nucleotide sequences of the internal transcribed spacers (ITS) of the nuclear rDNA cluster were identical for parasites...
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