Influence of strain origin on osmoregulatory and endocrine parameters of two non-native strains of Atlantic salmon (Salmo salar L.)

Benoît Bernard, Kevin Chantung Sobandi, Veerle Darras, Xavier Rollin, Robert Mandiki, Patrick Kestemont

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Non-native strains of Atlantic salmon are used in reinstatement trials where populations are extinct. Environmental cues like photoperiod and temperature are known to influence the smolting process and there is
evidence of strain-, stock-or population-specific differences associated with seaward migration or smoltification. The objective of this study was to compare morphological, osmoregulatory and endocrine features between two strains, one originating froma cold and short river in Ireland (Cong) and another from a long and warm river in France (Loire-Allier), reared under Belgian conditions in order to highlight major differences in restocking adaptability. Comprehensive endocrine profiles, consistent with their interactive role of mediating changes associated with smolting,
have been observed. Na+/K+ATPase activity (1.3-10.5 μmol ADP*mg prot.-1*h-1) and hormone plasma levels (e.g. 55-122 ng*mL-1of cortisol and 4.5-6.4 ng*mL-1of GH) were consistent with reported values. We observed
strain-related differences of the influence of temperature and daylength
on cortisol, GH and sodium plasma levels. These may be related to the respective environmental conditions prevailing in the river of origin, which have impacted the genetic background for smoltification. Using Na+/K+ATPase activity as an indicator, both strains smoltified successfully and simultaneously testifying a prevailing influence of environmental cues over genetic factors for smoltification.
langue originaleAnglais
Pages (de - à)205-212
Nombre de pages8
journalGeneral and Comparative Endocrinology
Volume258
Les DOIs
Etat de la publicationPublié - 1 mars 2018

mots-clés

  • Atlantic salmon
  • hormone profile
  • Na+/K+ATPase
  • repopulation
  • smoltification

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