Reproductive Cycle of Mya Arenaria in New England

Only a single reproductive cycle was observed in Mya arenaria gonads collected from areas north of Cape Cod.2. In eastern Maine, the spawning season extended from early June to the middle of August. Boothbay Harbor clams spawned from late June to late August. Clams from Plum Island Sound began spawning in July, a month later than eastern Maine clams, and completed spawning by late September.3. Observations of gonadal changes in Mya from southern Cape Cod indicated a biannual cycle occurs. These observations are supported by previous reports of spawning activities, larval occurrence, and gametogenesis in Mya from the southern latitudes.