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Influence of lake chemistry and fish age on cadmium, copper, and zinc concentrations in various organs of indigenous yellow perch (Perca flavescens)

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Concentrations of Cd, Cu, and Zn were determined in various organs of juvenile yellow perch (Perca flavescens) collected from eight lakes located along a metal concentration gradient. Metal exposure was evaluated on the basis of the free ambient Cd2+, Cu2+, Zn2+, and Ca2+ concentrations, as estimated from chemical equilibrium simulations using the ambient water chemistry data. Based on regression analyses, lake water Ca2+ and H+ did not significantly influence the steady-state metal concentrations in various body parts of yellow perch. Cadmium concentrations were significantly higher in the gastrointestinal tract than in the gills, suggesting that uptake of this metal from food is more important than uptake from water. Variations in the contribution of each organ to the total Cd and Cu burdens revealed a possible dysfunction in liver excreting capacities in the fish from the most highly contaminated lakes. Additionally, measurements on yellow perch from 0 to 10 years old (N = 81) collected from a single lake suggest that Cd concentrations in some organs increase with fish age, which we interpret to be linked to changes in fish growth rate with age.

Les concentrations en Cd2+, Cu2+, Zn2+ et Ca2+ ont été estimées par simulations chimiques à l'équilibre dans l'eau de huit lacs situés le long d'un gradient de concentrations métalliques. Des perchaudes (Perca flavescens) juvéniles y ont aussi été échantillonnées et les concentrations métalliques dans divers organes mesurées. Des analyses de régression ont révélé que les concentrations aqueuses en Ca2+ et en H+ n'influençaient pas significativement les concentrations métalliques dans divers organes des perchaudes. Les concentrations en Cd du tractus gastro-intestinal étaient plus élevées que dans les branchies, suggérant une prise en charge plus importante de ce métal par la nourriture que par l'eau. Les variations de la contribution de chaque organe aux teneurs totales en Cd et en Cu révélèrent une apparente saturation des capacités d'excrétion du foie chez les poissons en provenance des lacs très contaminés par ces métaux. Finalement, des mesures sur des perchaudes âgées de 0 à 10 ans (N = 81) échantillonnées dans un unique lac suggèrent que les concentrations en Cd dans certains organes augmentent avec l'âge du poisson, ce que nous interprétons comme un effet du changement du taux de croissance avec l'âge.

Document Type: Research Article

Publication date: September 1, 2004

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  • 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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