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

Here, we address 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...

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Main Authors: Songe, M.M., Willems, A., Wiik-Nielsen, J., Thoen, E., Evensen, A., West, P. van, Skaar, I.
Format: Journal Article
Language:Inglés
Published: Wiley 2016
Subjects:
fish
Online Access:https://hdl.handle.net/10568/66459
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author Songe, M.M.
Willems, A.
Wiik-Nielsen, J.
Thoen, E.
Evensen, A.
West, P. van
Skaar, I.
author_browse Evensen, A.
Skaar, I.
Songe, M.M.
Thoen, E.
West, P. van
Wiik-Nielsen, J.
Willems, A.
author_facet Songe, M.M.
Willems, A.
Wiik-Nielsen, J.
Thoen, E.
Evensen, A.
West, P. van
Skaar, I.
author_sort Songe, M.M.
collection Repository of Agricultural Research Outputs (CGSpace)
description Here, we address 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 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 these infection mechanisms representing a necrotrophic (S. diclina) vs. a facultative biotrophic strategy (S. parasitica).
format Journal Article
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language Inglés
publishDate 2016
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spelling CGSpace664592023-07-07T07:48:07Z Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L Songe, M.M. Willems, A. Wiik-Nielsen, J. Thoen, E. Evensen, A. West, P. van Skaar, I. fish Here, we address 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 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 these infection mechanisms representing a necrotrophic (S. diclina) vs. a facultative biotrophic strategy (S. parasitica). 2016-03 2015-05-29T11:23:38Z 2015-05-29T11:23:38Z Journal Article https://hdl.handle.net/10568/66459 en Open Access Wiley Songe, M.M., Willems, A., Wiik-Nielsen, J., Thoen, E., Evensen, Ø., van West, P. and Skaar, I. 2016. Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L. Journal of Fish Diseases 39(2): 343–352.
spellingShingle fish
Songe, M.M.
Willems, A.
Wiik-Nielsen, J.
Thoen, E.
Evensen, A.
West, P. van
Skaar, I.
Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title_full Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title_fullStr Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title_full_unstemmed Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title_short Saprolegnia diclina IIIA and S. parasitica employ different infection strategies when colonizing eggs of Atlantic salmon, Salmo salar L
title_sort saprolegnia diclina iiia and s parasitica employ different infection strategies when colonizing eggs of atlantic salmon salmo salar l
topic fish
url https://hdl.handle.net/10568/66459
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