A thicker chorion gives ova of Atlantic salmon (Salmo salar L.) the upper hand against Saprolegnia infections

MM Songe, A Willems, M N Sarowar, K Rajan, O. Evensen, Keith Drynan, I Skaar, P Van West

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Since the ban of malachite green in the fish farming industry, finding alternative ways of controlling Saprolegnia infections has become of utmost importance. Much effort has been made to elucidate the mechanisms by which Saprolegnia invade fish eggs. Little is known about the defence mechanisms of the hosts, making some eggs more prone to infection than others. One clue might lie in the composition of the eggs. As the immune system in the embryos is not developed yet, the difference in infection levels could be explained by factors influenced by the mother herself, by either transferring passive immunity, influencing the physical aspects of the eggs or both. One of the physical aspects
that could be influenced by the female is the chorion, the extracellular coat surrounding the fish egg, which is in fact the first major barrier to be overcome by Saprolegnia spp. Our results suggest that a thicker chorion in eggs from Atlantic salmon
gives a better protection against Saprolegnia spp. In addition to the identification of differences in sensitivity of eggs in a fish farm set-up, we were able to confirm these results in a laboratory-controlled challenge experiment.
Original languageEnglish
Pages (from-to)879-888
Number of pages10
JournalJournal of Fish Diseases
Volume39
Issue number7
Early online date8 Dec 2015
DOIs
Publication statusPublished - Jul 2016

Fingerprint

Saprolegnia
Chorion
Salmo salar
chorion
ova
Eggs
Ovum
egg
fish eggs
Infection
infection
Fishes
egg composition
malachite green
passive immunity
fish farms
fish culture
defense mechanisms
fish
immune system

Keywords

  • chorion
  • infection
  • oomycete
  • ova
  • salmon
  • saprolegnia
  • saprolegniosis

Cite this

A thicker chorion gives ova of Atlantic salmon (Salmo salar L.) the upper hand against Saprolegnia infections. / Songe, MM; Willems, A; Sarowar, M N; Rajan, K; Evensen, O.; Drynan, Keith; Skaar, I; Van West, P.

In: Journal of Fish Diseases, Vol. 39, No. 7, 07.2016, p. 879-888.

Research output: Contribution to journalArticle

Songe, MM ; Willems, A ; Sarowar, M N ; Rajan, K ; Evensen, O. ; Drynan, Keith ; Skaar, I ; Van West, P. / A thicker chorion gives ova of Atlantic salmon (Salmo salar L.) the upper hand against Saprolegnia infections. In: Journal of Fish Diseases. 2016 ; Vol. 39, No. 7. pp. 879-888.
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abstract = "Since the ban of malachite green in the fish farming industry, finding alternative ways of controlling Saprolegnia infections has become of utmost importance. Much effort has been made to elucidate the mechanisms by which Saprolegnia invade fish eggs. Little is known about the defence mechanisms of the hosts, making some eggs more prone to infection than others. One clue might lie in the composition of the eggs. As the immune system in the embryos is not developed yet, the difference in infection levels could be explained by factors influenced by the mother herself, by either transferring passive immunity, influencing the physical aspects of the eggs or both. One of the physical aspectsthat could be influenced by the female is the chorion, the extracellular coat surrounding the fish egg, which is in fact the first major barrier to be overcome by Saprolegnia spp. Our results suggest that a thicker chorion in eggs from Atlantic salmongives a better protection against Saprolegnia spp. In addition to the identification of differences in sensitivity of eggs in a fish farm set-up, we were able to confirm these results in a laboratory-controlled challenge experiment.",
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N2 - Since the ban of malachite green in the fish farming industry, finding alternative ways of controlling Saprolegnia infections has become of utmost importance. Much effort has been made to elucidate the mechanisms by which Saprolegnia invade fish eggs. Little is known about the defence mechanisms of the hosts, making some eggs more prone to infection than others. One clue might lie in the composition of the eggs. As the immune system in the embryos is not developed yet, the difference in infection levels could be explained by factors influenced by the mother herself, by either transferring passive immunity, influencing the physical aspects of the eggs or both. One of the physical aspectsthat could be influenced by the female is the chorion, the extracellular coat surrounding the fish egg, which is in fact the first major barrier to be overcome by Saprolegnia spp. Our results suggest that a thicker chorion in eggs from Atlantic salmongives a better protection against Saprolegnia spp. In addition to the identification of differences in sensitivity of eggs in a fish farm set-up, we were able to confirm these results in a laboratory-controlled challenge experiment.

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