Abstract
Addition of copper to the ambient water of perch resulted in decreased daily maximum respiration rates ( R max) and growth rates. The time-course of the effect in R max 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 R max. The variation in R max 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 R max 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 R max but not of growth rate.
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