Abstract
Routine oxygen consumption (VO2) was determined in six continuous flow respirometers in water containing different concentrations of the pesticides viz. Chlordane (organo‐chlorine), MetasystoxR (organophosphorus) and Sevin” (carbamate). All or none response was observed at the TL50 values of the pesticides, while at all other concentrations, the period of VO2 was marked in three distinct phases. Further, the oxygen uptake data indicate that, in general, there is a critical threshold time for the hyperactivity response. It was also revealed that animals which took the longest time to show the hyperactive response, exhibited the lower initial rates of oxygen consumption. As such, respiratory changes are good indicators of environmental stress.
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