Abstract
The frequency of swimming in Chlamys islandica (Pectinidae) was studied by removing all individuals from fixed areas and at varying time intervals counting the number of scallops migrating into these areas. The amount of byssus material produced could then be estimated. It was found that all sizes of Chlamys islandica swim equally often and that an individual scallop makes a swimming excursion every 31 days. The energy cost of the byssus material is a minor item in the energy budget of Chlamus islandica.

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