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This is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico. Males and females of C. sapidus can be distinguished by the sexual dimorphism in the shape of the abdomen (known as the "apron"). It is long and slender in males, but wide and rounded in mature females.
Callinectes sapidus is native to the western edge of the Atlantic Ocean from Nova Scotia to Argentina and around the entire coast of the Gulf of Mexico.
The natural predators of C. sapidus include eels, drum, striped bass, spot, trout, some sharks, humans, and cownose sting rays. C. sapidus is an omnivore, eating both plants and animals. C. sapidus typically consumes thin-shelled bivalves, annelids, small fish, plants and nearly any other item it can find, including carrion, other C. sapidus individuals, and animal waste. C. sapidus may be able to control populations of the invasive green crab, Carcinus maenas; numbers of the two species are negatively correlated, and C. maenas is not found in the Chesapeake Bay, where C. sapidus is most frequent.