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The reproductive cycle of Anadara tuberculosa (Sowerby, 1833) and its relationship with temperature and food availability in Magdalena Bay, Mexico was studied. Twenty five adult specimens were collected, on a monthly basis, between January 1998 and February 1999. Gonads were processed by routinary histology. The reproductive cycle was divided in five stages: resting, developing, ripe, spawning and spent. The developing stage was found within the interval March-October and December 1998, and also in February 1999. Spawning was observed within intervals: January-April and June-December 1998, reaching the highest frequencies in: January (60%), September (60%), and December (71.4%). Ripeness occurred within periods: January-March and June- December 1998, reaching the highest frequencies in July (70%) and August (57.8%). A significant relationship was found between temperature and ripe stage. The annual mean concentration of chlorophyll a was 2.8 mg m -3 , the lowest concentrations were 0.5 mg m -3 (January) and 0.8 mg m -3

Ciclo reproductivo de Anadara tuberculosa (Sowerby, 1833) (Arcidae) en Bahía Magdalena, México