Dépôt numérique

Use of performance indicators in evaluating chronic metal exposure in wild yellow perch (Perca flavescens).

Taylor, Lisa N.; McFarlane, Wendy J.; Pyle, Greg G.; Couture, Patrice; McDonald, D. Gordon (2004). Use of performance indicators in evaluating chronic metal exposure in wild yellow perch (Perca flavescens). Aquatic Toxicology , vol. 67 , nº 4. p. 371-385. DOI: 10.1016/j.aquatox.2004.01.018.

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The objective of this study was to evaluate the effects of copper exposure on swimming performance and gill-binding characteristics of wild yellow perch (Perca flavescens), a species endemic to metal-contaminated lakes of the Sudbury region in northern Ontario. Yellow perch were collected from lakes varying in the degree of metal contamination (Cu=1–21 μg/l), on two separate occasions for the investigation of swim performance and the analysis of gill-binding characteristics. Swim performance tests indicated that yellow perch from the contaminated lake had slightly greater endurance in a fixed velocity sprint test than fish from reference lakes, although the analysis of critical swimming speeds (Ucrit) did not reveal this same distinction between the groups. Differential sprint performance was in part due to differences in fish size within contaminated and reference lakes. Yellow perch from the contaminated lake also had higher resting levels of muscle glycogen and greater lactate production during high intensity exercise compared to yellow perch from the reference site. Acclimation occurred in the metal-contaminated yellow perch, as seen by the significantly elevated time to death (LT50) during an acutely lethal challenge to 600 μg Cu/l. However, gills from perch from the contaminated lake accumulated about three times more copper at death. In contrast, at a lower exposure range of water-copper (10–400 μg/l), the gills of fish from the contaminated lake tended to saturate with copper at lower concentrations than gills of fish from the reference lake (∼8 μg versus 23 μg Cu/g of gill tissue). In addition, perch from the contaminated lake exhibited a lower rate of sodium loss during the acute exposure to copper at ∼10 to 600 μg Cu/l. This study suggests that the amount of copper bound to (or accumulated within) the gills may not be diagnostic of acute toxicity for wild yellow perch from metal-contaminated lakes.

Type de document: Article
Mots-clés libres: swimming performance; copper; yellow perch; gill-binding; toxicity
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 15:04
Dernière modification: 08 janv. 2021 15:04
URI: http://espace.inrs.ca/id/eprint/11020

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