Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonising eggs of Atlantic salmon, Salmo salar L.

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cg.contributor.affiliationNorwegian Veterinary Instituteen_US
cg.contributor.affiliationInternational Livestock Research Instituteen_US
cg.contributor.affiliationUniversity of Aberdeenen_US
cg.contributor.affiliationNorwegian University of Life Sciencesen_US
cg.contributor.crpAgriculture for Nutrition and Healthen_US
cg.subject.ilriFISHen_US
dc.contributor.authorSonge, M.en_US
dc.contributor.authorWillems, A.en_US
dc.contributor.authorWiik-Nielsen, J.en_US
dc.contributor.authorThoen, E.en_US
dc.contributor.authorEvensen, A.en_US
dc.contributor.authorWest, P. vanen_US
dc.contributor.authorSkaar, I.en_US
dc.date.accessioned2015-10-13T12:22:34Zen_US
dc.date.available2015-10-13T12:22:34Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/68503en_US
dc.titleSaprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonising eggs of Atlantic salmon, Salmo salar L.en_US
dcterms.abstractIn this study, we addressed the morphological changes of eyed eggs of Atlantic salmon, Salmo salar L. infected with Saprolegnia from a commercial hatchery and after experimental infection. Eyed eggs infected with Saprolegnia spp. from 10 Atlantic salmon females were obtained. Egg pathology was investigated by light and scanning electron microscopy. Eggs from six of ten females were infected with S. parasitica, and two females had infections with S. diclina clade IIIA; two Saprolegnia isolates remained unidentified. Light microscopy showed that S. diclina infection resulted in the chorion in some areas being completely destroyed, whereas eggs infected with S. parasitica had an apparently intact chorion with hyphae growing within or beneath the chorion. The same contrasting pathology was found in experimentally infected eggs. Scanning electron microscopy revealed that S. parasitica grew on the egg surface and hyphae were found penetrating the chorion of the egg, and re-emerging on the surface away from the infection site. The two Saprolegnia species employ different infection strategies when colonizing salmon eggs. Saprolegnia diclina infection results in chorion destruction, while S. parasitica penetrates intact chorion. We discuss the possibility that these infection mechanisms represent a necrotrophic (S. diclina) versus a facultative biotrophic strategy (S. parasitica).en_US
dcterms.accessRightsLimited Accessen_US
dcterms.bibliographicCitationSonge, M., Willems, A., Wiik-Nielsen, J., Thoen, E., Evensen, Ø., van West, P. and Skaar, I. 2015. Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonising eggs of Atlantic salmon, Salmo salar L. Abstract of presentation at the 17th International Conference on Diseases of Fish and Shellfish, Las Palmas, Spain, 7-11 September 2015.en_US
dcterms.issued2015-09en_US
dcterms.languageenen_US
dcterms.typeConference Paperen_US

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