Inferring occurrence of growth checks in pike (Esox lucius) scales by using sequential isotopic analysis of otoliths

• Published in: Rapid Communications in Mass Spectrometry
• Main Authors: Gerdeaux, Daniel, Dufour, Elise
• Other Authors: Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ), Muséum national d'Histoire naturelle (MNHN)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: WHITEFISH COREGONUS-LAVARETUS; COD GADUS-MORHUA; LAKE ANNECY; AGE VALIDATION; NORTHERN PIKE; ATLANTIC COD; FISH; ACCURACY; PRECISION; VALUES; [SDV]Life Sciences [q-bio]; atlantic cod; Gadus morhua
• Online Access: https://hal.inrae.fr/hal-02645568; https://doi.org/10.1002/rcm.6165

International audience RATIONALE: Sequential analysis of otolith oxygen isotope (delta O-18(oto)) values was performed by classical mechanical microdrilling and dual inlet mass spectrometry to infer the timing of growth checks in pike (Esox lucius) scales from Lake Annecy (France). It indicated that the first check on scales occurs before the first winter of life of the fish. METHODS: Eleven fish caught in February and June 2008 were studied. Intra-individual isotopic profiles exhibit cyclic variations that are consistent with that of modeled delta O-18(oto) values using variations in epilimnion temperature and otolith-specific isotope fractionation equations. The positions of growth checks on scales were compared with the periodic variations of delta O-18(oto) values on otolith radii using an allometric relationship. RESULTS: All individuals presented at least one check deposited before the first winter. Deposition of some checks might be linked to a shift in fish diet or habitat or to catch-and-release induced stress. CONCLUSIONS: Although coupling between sequential analysis of delta O-18(oto) values and observation of scale growth features has been shown to be useful, there are limitations in the methodology, especially for the growth-attenuated region of otoliths associated with older ages. Copyright (C) 2012 John Wiley & Sons, Ltd.