Abstract
1. 1. Luidia clathrata is a common inhabitant of shallow bays in which the dissolved oxygen levels may decrease to less than 3 mg O 2/l in the summer. 2. 2. The behavioral activity of L. clathrata was depressed after a 3 day exposure to 29, 36, 44 mm Hg O 2; partial recovery occurred after return to air-saturated water for 24 hr. Activity was not significantly depressed at 53 and 67 mm Hg O 2. 3. 3. The O 2 level below which L. clathrata deteriorated after a 3 day exposure was 38 mm Hg. 4. 4. Luidia clathrata is an apparent oxyregulator down to 30–40 mg Hg but the relation between PO 2 and VO 2 is not described well by a quadratic regression equation.
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