Tissue localization of selenium of parental or dietary origin in rainbow trout ( Oncorhynchus mykiss ) fry using LA-ICP MS bioimaging

Pauline Wischhusen (1) , Carine Arnaudguilhem (2) , Maïté Bueno (2) , Germain Vallverdu (2) , Brice Bouyssière (2) , Mickael Briens (3) , Philip Antony Jesu Prabhu (4) , Pierre-André Geraert (3) , Sadasivam Kaushik (1) , Benoit Fauconneau (1) , Stéphanie Fontagné-Dicharry (1) , Sandra Mounicou (2)

1 NuMéA - Nutrition, Métabolisme, Aquaculture
2 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
3 Adisseo France SAS, F-92160 Antony
4 IMR - Institute of Marine Research [Bergen]

In relation to the decrease of selenium (Se) content in aquafeeds, the impact of level and form of parental and dietary Se supplementation was investigated in rainbow trout fry using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICP MS) bioimaging. The offspring of rainbow trout broodstock, fed either a control diet without any Se supplementation (0.3 mg Se/kg diet) or a diet supplemented with Se (0.6 mg Se/kg diet) either as sodium selenite or hydroxy-selenomethionine were sampled at swim-up fry stage or after 11 weeks of cross-feeding. Total body Se levels were influenced by parental Se nutrition in swim-up fry and by direct Se feeding in 11-week fry with higher levels in the Se-supplemented groups compared to the control and the highest levels in the hydroxy-selenomethionine treatment. The Se retention was lower for dietary sodium selenite. SeMet levels increased when Se was provided as hydroxy-selenomethionine. LA-ICP MS maps revealed yolk in swim-up fry and intestine, liver and kidney in 11-week fed fry as tissues with high Se abundance. In swim-up fry, muscle Se was the highest abundant when parents were fed hydroxy-selenomethionine. In 11-week fed fry, muscle Se abundance was higher in the head part of fry fed both Se-supplemented diets, but only in fry fed hydroxy-selenomethionine in the tail part. Liver Se abundance was higher in fry fed sodium selenite compared to the control diet supporting the hypothesis that tissue Se distribution can be influenced by parental and dietary Se forms and levels

Domains: Chemical Sciences; Analytical chemistry; Life Sciences [q-bio]; Food and Nutrition

Pauline Wischhusen, Carine Arnaudguilhem, Maïté Bueno, Germain Vallverdu, Brice Bouyssière, et al.. Tissue localization of selenium of parental or dietary origin in rainbow trout ( Oncorhynchus mykiss ) fry using LA-ICP MS bioimaging. Metallomics, 2021, 13 (2), ⟨10.1093/mtomcs/mfaa008⟩. ⟨hal-03097490⟩