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Experimental Spironucleus infections in Atlantic salmon (Salmo salar): Hidden secrets of the life cycle of Spironucleus salmonicida revealed
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Biology Education Centre.
2018 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

We have performed experimental infections of Atlantic salmon (Salmo salar) from the Baltic Sea region with the protozoan parasite Spironucleus salmonicida. By this infection trial we have been able to show that the life cycle may use an alternative route of transmission. Instead of the commonly used faecal-oral route, the parasites can also be excreted directly into the surrounding water from the mucous layer of the skin or from an ulcerated skin lesion. Three different stages of the infection were identified: one intestinal, one blood stage and one tissue stage. New putative life-cycle forms of S. salmonicida cells detected by ex-vivo cell-cultures. Similar cells were also observed in imprints from skin lesions sampled during the experimental infection trials. The cells differed morphologically, from normal trophozoite cells and indicate an alternative cell-cycle when exposed to salmonid host cells.

Place, publisher, year, edition, pages
2018. , p. 30
Keywords [en]
Parasite, Salmon, Infection, Diplomonada, Spironucleus
National Category
Other Biological Topics
Identifiers
URN: urn:nbn:se:uu:diva-357313OAI: oai:DiVA.org:uu-357313DiVA, id: diva2:1238877
External cooperation
National Veterinary Institute (SVA)
Educational program
Master Programme in Biology
Supervisors
Examiners
Available from: 2018-08-20 Created: 2018-08-14 Last updated: 2018-08-20Bibliographically approved

Open Access in DiVA

The full text will be freely available from 2023-12-31 19:13
Available from 2023-12-31 19:13

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