Abstract
1. 1. Rates of filtration of neutral red by aerobic and hypoxic fresh water clams were measured to determine the role of previously observed hypoxic intense valve activity. 2. 2. Aerobic clams filtered readily, showing a mean initial rate of 0·051 ± 0·008 mg/min ( Actinonaias carinata), 0·025 ± 0·006 mg/min ( Elliptio dilatatus) and 0·019 ± 0·006 mg/min ( Pleurobema coccineum). 3. 3. The hypoxic rate was reduced to 0·011 ±0·006 mg/min ( E. dilatatus) and 0·016±0·006 mg/min ( P. coccineum), even though measurements were taken only when individuals had active valves and open siphons. 4. 4. It is concluded that the hypoxic intense valve activity does not have the replenishment of tissue oxygen as a major function.
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