Written Paper

Sphaerospora elwhaiensis sp. n. (Myxosporea: Sphaerosporidae) from landlocked sockeye salmon Oncorhynchus nerka (Salmoniformes: Salmonidae) in Washington State, USA  [2011]

Jones, S.,Fisheries and Oceans Canada, Nanaimo (Canada). Pacific Biological Station Fiala, I.,Akademie Ved, Ceske Budejovice (Czech Republic). Parazitologicky Ustav Prosperi-Porta, G.,Fisheries and Oceans Canada, Nanaimo (Canada). Pacific Biological Station House, M.,Northwest Indian Fisheries Commission, Olympia (USA) et al.

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A new species of sphaerosporid myxosporean, Sphaerospora elwhaiensis sp. n., is described from kidney of non-anadromous Oncorhynchus nerka from Lake Sutherland in the northern Olympic Peninsula, Washington, USA. Infection with the parasite was detected in 45% of 177 kokanee examined over 5 years. While conforming to the morphological criteria by which members of the genus are defined, the parasite is distinguished from congeners in salmonids of western North America by a unique combination of valvular sculpting of the myxospore, the relatively large size of the myxospore and monosporous development within the pseudoplasmodium. In addition, nucleotide sequences of the parasite's small and large subunit ribosomal RNA gene are unique. Phylogenetic analyses of these sequences suggested that the parasite is most closely related to freshwater Myxidium spp. and Zschokkella spp. The molecular data have provided further evidence for a polyphyletic association previously recognized among members of the genus and emphasize the need for a taxonomic revision of Sphaerospora and related genera.

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Folia Parasitologica (Czech Republic)

ISSN : 0015-5683