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Elemental signatures in otoliths of hatchery rainbow trout (Oncorhynchus mykiss): distinctiveness and utility for detecting origins and movement

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Abstract:

Otolith chemistry in freshwater has considerable potential to reveal patterns of origin and movement, which would benefit traditional fisheries management and provide a valuable tool to curb the spread of invasive and illicitly stocked species. We evaluated the relationship between otolith and water chemistry for five markers (Ba/Ca, Mn/Ca, Sr/Ca, Zn/Ca, and 87Sr/86Sr) in rainbow trout (Oncorhynchus mykiss) using the existing hatchery system in Colorado and Wyoming, USA, to provide controlled, seminatural conditions. Otolith Ba/Ca, Sr/Ca, and 87Sr/86Sr reflected ambient levels, whereas Mn/Ca and Zn/Ca did not. Using only the markers correlated with water chemistry, we classified fish to their hatchery of origin with up to 96% accuracy when element and isotope data were used together. Large changes in 87Sr/86Sr were evident in otolith transects, although subtler changes in Sr/Ca were also detectable. Our results suggest the relatively few otolith markers that reflect ambient chemistry can discriminate among locations and track movements well enough to provide valuable insight in a variety of applied contexts.

La chimie des otolithes en eau douce présente un potentiel considérable pour révéler les patrons d’origine et de déplacement, ce qui pourrait être bénéfique pour la gestion traditionnelle des pêches et fournir un outil pour réduire la dispersion des espèces envahissantes ou introduites de façon illicite. Nous évaluons les relations entre la chimie des otolithes et celle de l’eau pour cinq marqueurs (Ba/Ca, Mn/Ca, Sr/Ca, Zn/Ca et 87Sr/86Sr) chez la truite arc-en-ciel (Oncorhynchus mykiss) dans le réseau actuel de piscicultures du Colorado et du Wyoming, É.-U., afin d’obtenir des conditions semi-naturellescontrôlées. Les rapports Ba/Ca, Sr/Ca et 87Sr/86Sr, mais non Mn/Ca et Zn/Ca, correspondent aux valeurs du milieu ambiant. En n’utilisant que les marqueurs qui sont corrélés avec la chimie de l’eau, nous avons réparti les poissons en fonction de leur pisciculture d’origine avec une exactitude pouvant atteindre 96% lorsque les données élémentaires et isotopiques sont utilisées conjointement. D’importants changements de 87Sr/86Sr sont évidents dans les transects d’otolithes, bien que des changements plus subtils de Sr/Ca soient aussi décelables. Nos résultats indiquent que le nombre relativement restreint de marqueurs des otolithes qui représentent la chimie du milieu ambiant permet de séparer les sites et de suivre les déplacements assez bien pour fournir des perspectives intéressantes dans une variété de contextes d’application.

Document Type: Research Article

Publication date: April 1, 2009

More about this publication?
  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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