The effects of copper on maximum respiration rate and growth rate of perch, Perca fluviatilis L. |
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Authors: | Lars Collvin |
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Affiliation: | Institute of Limnology, University of Lund, Box 3060, S-220 03 Lund, Sweden |
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Abstract: | Addition of copper to the ambient water of perch resulted in decreased daily maximum respiration rates (Rmax) and growth rates. The time-course of the effect in Rmax was characterized by: (1) an initial decrease over three additions; (2) a minimal “trough” lasting some 10–15 days; and (3) a phase of increasing Rmax. The variation in Rmax was due to copper concentration and exposure time. The decrease in growth rate was most dramatic initially and was correlated to copper concentration and perch weight. The subsequent increase in growth rate was constant and independent of copper concentration. The increase in Rmax and in growth rate was interpreted as acclimatization. Up to a given sublethal copper concentration acclimatization resulted in a return to the control level of Rmax but not of growth rate. |
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Keywords: | copper ionic sublethal respiration rate growth rate |
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