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Effects of different ligands on the bioaccumulation and subsequent depuration of dietary Cu and Zn in juvenile rainbow trout (Oncorhynchus mykiss)

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The effects of different ligands on the bioavailability of dietary copper (Cu) and zinc (Zn) to fish have not been thoroughly investigated. We therefore exposed juvenile rainbow trout (Oncorhynchus mykiss; ~200 mg body weight) to control food or to food supplemented with different Cu (~400 µg·g–1 food) or Zn (~1000 µg·g–1 food) compounds. Tissue metal accumulation was compared among groups. Fish fed CuO showed no differences in tissue Cu concentrations relative to control fish, suggesting that Cu was not readily available for uptake in this form. In contrast, Cu in the form of CuSO4, Cu-proteinate, or Cu-lysine was much more available for uptake, resulting in substantial increases in liver, gut tissue, and whole-body Cu concentrations during the loading phase and decreases during depuration, although liver and whole-body levels remained elevated after 2 weeks. We found no differences in tissue Cu accumulation among these three complexes. There were no effects on growth. For Zn, we found no differences among any of the treatments, including controls, in Zn accumulation or growth. Overall, there was homeostasis of whole-body and tissue-specific Zn concentrations despite the large differences in dietary Zn loads.

Les effets de plusieurs ligands sur la biodisponibilité du le cuivre (Cu) et du le zinc (Zn) alimentaires chez les poissons ne sont pas entièrement connus. Nous avons donc exposé des jeunes truites arc-en-ciel (Oncorhynchus mykiss; ~200 mg de masse corporelle) à un régime alimentaire témoin ou à de la nourriture additionnée de divers composés de Cu (~400 µg·g–1 de nourriture) ou de Zn (~1000 µg·g–1 de nourriture). Nous avons ensuite comparé l'accumulation des métaux dans les tissus de chacun des groupes. Les poissons nourris de CuO ont des concentrations de Cu dans leurs tissus qui ne diffèrent pas de celles des poissons témoins, ce qui indique que le Cu n'est pas facilement assimilable sous cette forme. En revanche, le Cu sous forme de CuSO4, de protéinate de Cu ou de complexe Cu-lysine est beaucoup plus assimilable; il en résulte des accroissements substantiels des concentrations de Cu dans le foie, les tissus du tube digestif et dans le corps entier durant la phase d'accumulation, ainsi que des déclins lors de l'élimination, bien que les concentrations dans le foie et le corps entier demeurent élevées après deux semaines. Il n'y a pas de différence dans les accumulations tissulaires entre ces trois complexes, ni d'effet sur la croissance. Dans le cas du Zn, il n'y a pas de différence entre les traitements expérimentaux, y compris les témoins, en ce qui a trait à l'accumulation de Zn ou à la croissance. Somme toute, il y a une homéostasie des concentrations de Zn à l'échelle du corps entier et des différents tissus, malgré les grandes différences dans les apports alimentaires de Zn.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2006

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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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