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

Simple item page
cg.contributor.affiliationNorwegian Veterinary Instituteen
cg.contributor.affiliationInternational Livestock Research Instituteen
cg.contributor.affiliationUniversity of Aberdeenen
cg.contributor.affiliationNorwegian University of Life Sciencesen
cg.contributor.crpAgriculture for Nutrition and Health
cg.subject.ilriFISHen
dc.contributor.authorSonge, M.en
dc.contributor.authorWillems, A.en
dc.contributor.authorWiik-Nielsen, J.en
dc.contributor.authorThoen, E.en
dc.contributor.authorEvensen, A.en
dc.contributor.authorWest, P. vanen
dc.contributor.authorSkaar, I.en
dc.date.accessioned2015-10-13T12:22:34Zen
dc.date.available2015-10-13T12:22:34Zen
dc.identifier.urihttps://hdl.handle.net/10568/68503
dc.titleSaprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonising eggs of Atlantic salmon, Salmo salar L.en
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
dcterms.accessRightsLimited Access
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
dcterms.issued2015-09
dcterms.languageen
dcterms.typeConference Paper

Files

License bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.75 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ILRI conference papers
ILRI Food Safety and Zoonoses program outputs
Nutrition and food safety in Barotse, Zambia