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Otolith microchemistry and isotopic analyses have emerged as effective techniques for providing insights into fish environmental history that are difficult to obtain by other means. Stable hydrogen isotope ratio ( 2 H/ 1 Ho r D/H, expressed as δD) is a possible environmental marker that has not been employed in fish provenance research, although it has been applied as a natural tracer of terrestrial organism migrations. We illustrate the potential of δD to serve as a new natural marker of fish environmental history by demonstrating that significant linear relationships (r 2 ≥ 0.97) exist between fish otolith and muscle δD and δD of waters that fish inhabit. Differences between mean water δD and both muscle and otolith δD were not significantly correlated with fish total length and were not significantly different among species, indicating that water-fish δD relationships are consistent across fish sizes and species. High r 2 values for re- gressions of otolith and muscle δD on water δD for fishes inhabiting locations with diverse thermal regimes suggest that relationships between water and fish δD are not strongly affected by water temperature. Demonstration that fish δD clearly reflects water δD provides a foundation for future research to reconstruct fish movement among locations with distinct δD signatures. Resume : La microchimie des otolithes et les analyses isotopiques se sont averees etre des techniques efficaces pour obtenir des retrospectives de l'histoire environnementale des poissons qu'il serait difficile d'avoir autrement. Le rapport des isotopes stables d'hydrogene ( 2 H/ 1 H ou D/H, exprime comme δD) est un marqueur environnemental potentiel qui n'a pas ete utilise dans les etudes sur l'origine des poissons, alors qu'il a ete employe comme traceur naturel des migrations d'organismes terrestres. Nous illustrons le potentiel de δD comme nouveau traceur naturel de l'histoire environnementale des poissons en demontrant qu'il existe des relations lineaires significatives (r 2 ≥ 0,97) entre les δD des otolithes et des muscles et le δD des eaux frequentees par les poissons. Les differences entre le δD moyen de l'eau et les δD des otolithes et des muscles ne sont pas en correlation significative avec la longueur totale des poissons et ne different pas significativement en fonction des especes, ce qui indique que les relations δD eau-poissons sont unifor- mes, quelles que soit la taille ou l'espece de poisson. Les fortes valeurs de r 2 des regressions des δD des otolithes et des muscles sur les δD de l'eau chez des poissons qui vivent dans des regimes thermiques differents laisse croire que les relations entre les δD de l'eau et des poissons ne sont pas fortement affectees par la temperature de l'eau. La demonstration que les δD des poissons refletent clairement le δD de l'eau fournit une base pour les travaux futurs afin de recapituler les deplacements des poissons dans des sites possedant des signatures de δD differentes.

Stable hydrogen isotopic composition of fishes reflects that of their environment