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Défense de thèse de doctorat en sciences biologiques

Physiological response of smolts from two strains of Atlantic salmon, Salmo salar L., to a temperature increase on their migratory route

Catégorie : défense de thèse
Date : 26/04/2018 15:00 - 26/04/2018 17:00
Lieu : Amphithéâtre L12, rue Grafé, 5000 Namur
Orateur(s) : Benoît BERNARD
Organisateur(s) : Patrick KESTEMONT
Jury

Isabelle LEGUEN (INRA), Michaël OVIDIO (ULg), Sigurd STEFANSSON (Université de Bergen, Norvège), Frédéric SILVESTRE, président (UNamur), Robert MANDIKI, promoteur (UNamur), Patrick KESTEMONT, promoteur (UNamur)

Résumé

In Belgium, the population of Atlantic salmon disappeared in the 1940’s. A restoration program in the Meuse Basin was launched in 1987. Despite many efforts, results are still poor with only few adult spawners captured. Environmental data show temperature differences, sometimes exceeding 5°C, between a tributary and a larger river during the downstream migration period. Since temperature is a primary cue in smolting, we investigated the potential effects of such thermal conditions on smoltification. We looked for differences of various physiological smoltification markers between two strains of fish and between early and late migrants. We also examined the transcriptional response of smoltification-related genes in two crucial organs, the liver and gills. We then aimed at verifying our experimental results in the field by sampling smolts in two sites where temperature differences had been measured.

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