Abstract
Respiration rates of M. edulis L. eggs, trochophore and veliconcha larvae of different sizes have been estimated at 6.degree., 12.degree. and 18.degree. C. They were related to data of body weight and filtration capacity. Maximum swimming speeds observed corresponded to the velocity with which the larva sinks. The significance of activity could thus be discussed regarding the sinking rates of the larva; expressed as percentage of the respiration rate it was highest at low temperatures and increased with larval size.

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