Abstract
Changes in tissue weight and in biochemical composition for a standard animal of the bivalve Astarte montagui (Dillwyn) from a station in the Largs Channel in the Clyde Sea Area were studied during 1969–1971. Spawning took place during the autumn months and was accompanied by a decrease in tissue weight which was then continued until March. Tissue weight increased between April and July. A. elliptica (Brown) and A. sulcata (da Costa) from the same area both showed an essentially similar cycle of tissue weight changes, with evidence that spawning occurred during the autumn. The biochemical changes accompanying this cycle, and the resultant changes in caloric content of the tissues are described for A. montagui.
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