Effects of environmental metal contamination on the condition, swimming performance, and tissue metabolic capacities of wild yellow perch (Perca flavescens)

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Abstract:

In this study, the general condition, swimming capacities, and tissue metabolic capacities and metal concentrations in wild yellow perch (Perca flavescens) were examined from a range of metal-contaminated lakes near Sudbury, Ontario. Fish exposed to elevated environmental cadmium and copper concentrations showed higher liver concentrations of these metals and lower condition indices. Because growth rate appeared lower in the most metal-contaminated fish, the high tissue activities of nucleoside diphosphate kinase, an indicator of biosynthesis, in these fish indicated an increased rate of protein turnover and suggested a bioenergetic cost of metal exposure. Yellow perch from the most metal-contaminated lakes exhibited lower aerobic capacities, as indicated by citrate synthase and b-hydroxyacyl coenzyme A dehydrogenase activities, two mitochondrial enzymes involved in aerobic adenosine triphosphate production, and by critical swimming speed. There was no evidence from our data that environmental metal exposure affected anaerobic capacities of tissues as measured by lactate dehydrogenase activities or anaerobic fast-start swimming performance. Overall, these data show that metal exposure leads to measurable effects on metabolic capacities in wild yellow perch.

Nous avons examiné la condition physique générale, la capacité de nage, la capacité métabolique tissulaire et les concentrations de métaux chez des perchaudes sauvages (Perca flavescens) provenant d'une gamme de lacs contaminés aux métaux, près de Sudbury, Ontario. Les poissons exposés à des concentrations élevées de cadmium et de cuivre ont de plus fortes concentrations de ces métaux dans leur foie et leur coefficient d'embonpoint est plus faible. Puisque le taux de croissance semble plus bas chez les poissons contaminés par les métaux, la forte activité tissulaire de la nucléoside diphosphate kinase, un indicateur de la biosynthèse, chez ces poissons, signale un taux accru de remplacement des protéines et semble représenter le coût métabolique de l'exposition aux métaux. Les perchaudes de la plupart des lacs contaminés aux métaux ont des capacités aérobies réduites, ce qui se reflète dans la vitesse critique de nage et dans les activités de la citrate synthase et de la b-hydroxyacyl-coenzyme A déshydrogénase, deux enzymes des mitochondries impliquées dans la production de triphosphate d'adénosine. Si on se fie à l'activité de la lactate dés hydrogénase ou à la performance de nage anaérobie à départ rapide, il n'y a aucune indication dans nos données que l'exposition aux métaux dans l'environnement affecte les capacités anaérobies des tissus. De façon générale, nos données démontrent qu'une exposition aux métaux produit des effets mesurables sur les capacités métaboliques de la perchaude sauvage.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2002

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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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