Parasitology Research

, Volume 100, Issue 6, pp 1389–1394

Mitochondrial haplotype diversity of Gyrodactylus thymalli (Platyhelminthes; Monogenea): extended geographic sampling in United Kingdom, Poland, and Norway reveals further lineages

Short Communication

DOI: 10.1007/s00436-006-0423-5

Cite this article as:
Hansen, H., Bakke, T.A. & Bachmann, L. Parasitol Res (2007) 100: 1389. doi:10.1007/s00436-006-0423-5


In recent years, the mitochondrial haplotype diversity of the monogenean ectoparasites Gyrodactylus salaris Malmberg, 1957 on Atlantic salmon and G. thymalli Žitňan, 1960 on grayling has been studied intensively to understand the taxonomy and phylogeography of the two species. According to these studies, neither species can be considered monophyletic, but unfortunately, the geographic sampling has mostly been restricted to Fennoscandia. Only few samples from continental Europe have been analysed, and samples from the United Kingdom have not been included at all. Gyrodactylosis is a notifiable disease in Europe and is in the UK considered the most important exotic disease threat to wild Atlantic salmon populations. In this study, we report six new mitochondrial haplotypes of G. thymalli from England, Poland, and Norway detected by sequencing 745 bp of the cytochrome oxidase I gene. The six new haplotypes add five new clades to a neighbor-joining dendrogram deduced on the basis of the currently known 44 mitochondrial haplotypes for G. thymalli and G. salaris. We conclude that G. thymalli established in the UK along with the immigration of grayling. There is currently no reason to suspect that this parasite is a threat to Atlantic salmon in the UK, although its infectivity to salmon stocks in the UK has not been tested.

Supplementary material

436_2006_423_MOESM1_ESM.doc (111 kb)
ESM 1List of mitochondrial haplotypes described for G. salaris and G. thymalli and the corresponding GenBank accession numbers. Haplotype names are according to Hansen et al. 2003, 2006, and Meinilä et al. 2006. New haplotypes described in this study are listed in bold. Alignment (745 bp) of cytochrome oxidase (CO1) sequences of G. salaris/G. thymalli from Hansen et al. 2003, 2006; Meinilä et al. 2004 and current study. Haplotypes new for the current study are shaded in grey.(DOC 113 kb)

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Zoology, Natural History MuseumUniversity of OsloOsloNorway

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