The concentration of plasma metabolites varies throughout reproduction and affects offspring number in wild brown trout (Salmo trutta)

Zoé Gauthey (1) , Marine Freychet (1) , Aurélie Manicki (1) , Alexandre Herman (2) , Olivier Lepais (1) , Stéphane Panserat (2) , Arturo Elosegi (3) , Cédric Tentelier (1) , Jacques Labonne (1)

1 ECOBIOP - Ecologie Comportementale et Biologie des Populations de Poissons
2 NUAGE - Nutrition, Aquaculture et Génomique
3 Faculty of Science and Technology

In wild populations, measuring energy invested in the reproduction and disentangling investment in gametes versus investment in reproductive behavior (such as intrasexual competition or intersexual preference) remain challenging.In this study,we investigated the energy expenditure in brown trout reproductive behavior by using two proxies: variation in weight and variation of plasma metabolites involved in energy production, over the course of reproductive season in a semi natural experimental river. We estimated overall reproductive success using genetic assignment at the end of the reproductive season. Results show that triglycerides and free fatty acid concentrations vary negatively during reproduction, while amino-acids and glucose concentrations remain stable.Decrease in triglyceride and free fatty acid concentrations during reproduction is not related to initial con- centration levels or to weight variation. Both metabolite concentration variations and weight variations are correlated to the number of offspring produced, which could indicate that gametic and behavioral reproductive investments substantially contribute to reproductive success in wild brown trout. This study opens a path to further investigate variations in reproductive investment in wild populations

Mots clés: plasma metabolite; reproductive investment; reproductive success; metabolic status; salmonid; fish; salmonids; sea trout; energy expenses

Mots clés: poisson; salmonidae; salmo trutta; reproduction; métabolisme; dépense énergétique; métabolite du plasma

Domaines: Biologie de la reproduction

Zoé Gauthey, Marine Freychet, Aurélie Manicki, Alexandre Herman, Olivier Lepais, et al.. The concentration of plasma metabolites varies throughout reproduction and affects offspring number in wild brown trout (Salmo trutta). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 2015, 184, pp.90-96. ⟨10.1016/j.cbpa.2015.01.025⟩. ⟨hal-01901347⟩