Abstract
Abstract An activity quotient (Aq) is described which can be used to detect the stress response of fishes to sublethal concentrations of pollutants. The quotient considers three variables; ventilation frequency (Y), coughing rate (C), and pectoral fin activity (PA), and is represented importance of a respiratory component.(numerator values) and an activity component (denominator value) are indicated and constancy of one variable does not negate the Aq value. The Aq was found to be adequate to detect stress due to waterborne selenium and should prove to be a useful tool for screening wastewater and estimating chronically safe toxicant concentrations.
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