Menippe mercenaria has separate sexes. Spawning usually occurs between April and September. Under laboratory conditions, female stone crabs will spawn several times during a molting period throughout the year (Cheung 1969). In the field, females spawn every month but spawn most frequently during the warmer months from March to September (Sullivan 1979). Menippe mercenaria females carry the spawned eggs under the abdomen. Hybrid populations resulting from the pairing of Menippe mercenaria with Menippe adina are commonly found where these species co-occur (Wilber 1989).
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