As Menippe mercenaria grows and develops, its food habits change. The larvae and pre-juvenile stone crabs are opportunistic carnivores that feed on smaller zooplankton. The juvenile and adult stone crabs are still opportunistic carnivores, but feed on animals that are larger than the zooplankton. Utilizing their massive and powerful claws, adult stone crabs feed on acorn barnacles, hard shelled clams, scallops, and conch.
Animal Foods: mollusks; aquatic or marine worms; aquatic crustaceans; echinoderms; other marine invertebrates; zooplankton
Primary Diet: carnivore (Eats non-insect arthropods, Molluscivore ); planktivore