Oxygen consumption (µl% mg dry wt . • hr' corrected to STP) in Chaoborus punctipennis was measured in a Gilson differential respirometer at two-hour intervals during 24-hour periods . Animals were held at controlled conditions similar to those at the time of collection . Respiration was measured under controlled temperatures and natural photoperiod . Measurements were begun about 36 hours after collection .Winter-collected animals showed a lower and more stable respiration than summer and fall-collected animals which did not differ from one another . Respiration increased with temperature becoming quite variable at 3o°C where mortality was highest . Animals collected at different seasons and subjected to a variety of temperatures did not show a predictable pattern of respiration during the daily cycle under any condition tested .Since the 36-hour delay in respiration measurements could have dampened a diet cycle, oxygen consumption was determined within an hour of collection and followed for 24 hours . For this experiment animals were collected at six-hour intervals over a 24-hour period . Respiration did not show a predictable pattern of variation during the day-night cycle .
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