Lipid dynamics in early life stages of the icefish Chionodraco hamatus in the Dumont d’Urville Sea (East Antarctica)

• Published in: Polar Biology
• Main Authors: Giraldo, Carolina, Boutoute, Marc, Mayzaud, Patrick, Tavernier, Eric, Quang, An Vo, Koubbi, Philippe
• Other Authors: Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géomorphologie dynamique et aménagement des littoraux (GéoDAL), Université du Littoral Côte d'Opale (ULCO), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Université de Caen Normandie (UNICAEN), Normandie Université (NU)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: Larvae; Fatty acids; Nutritional condition; Antarctica; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Antarctic; East Antarctica; Dumont d’Urville; Antarc*; D’Urville Sea; Icefish; Polar Biology
• Online Access: https://hal.sorbonne-universite.fr/hal-01317616; https://hal.sorbonne-universite.fr/hal-01317616/document; https://hal.sorbonne-universite.fr/hal-01317616/file/Giraldo_2016_Lipid_dynamics_in.pdf; https://doi.org/10.1007/s00300-016-1956-4

International audience Lipids play a crucial role in polar regions and are of particular importance in early life stages of Antarctic fish. This work presents the significance of lipids and fatty acids (FAs) in the early life stages of the icefish Chionodraco hamatus. Analysis of lipid classes (polar lipids, PL; cholesterol, Chol; and triacylglycerol, TAG) suggested different energy allocation strategies in preflexion (<25 mm) and postflexion larvae (>25 mm). Structural PL dominated lipid dynamics for preflexion larvae, indicating that small individuals allocate the majority of energy toward somatic growth. Conversely, postflexion larvae appear able to switch between growth (contribution of PL) and energy storage (contribution of TAG) strategies. The condition index ratio TAG/Chol varied from 0.2 to <2 with no differences between the two larval stages. Further, FA composition of the TAG and PL fractions suggests that both developmental stages share the same carnivorous diet and that C. hamatus relies on a few key prey items.