Abstract
1. 1. The oxygen uptake in the mussel Mytilus edulis is hyperbolic related to declining oxygen tension, indicated by the exhaustion of all available oxygen and the asymptotic oxygen uptake rate at hyperoxic conditions. 2. 2. Using artificial water irrigation of the mantle cavity, ranging from 2.9 to 16.41/hr, the oxygen consumption rate of starved specimens increases by a factor at 1.4. 3. 3. The artificial irrigation seems to determine both the level of oxygen consumption at high oxygen tensions, and the dependency of oxygen consumption at declining oxygen tension. 4. 4. The oxygen uptake takes place over the entire, undifferentiated body surface, indicating that large amounts of water transported across the ctenidia mainly serve a feeding function. 5. 5. It is therefore postulated that the ctenidia of Mytilus edulis serve mainly a feeding function.
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