Callinectes sapidus

Callinectes sapidus is a swimming crab native to the western Atlantic, commonly called the blue crab. It is distinguished by flattened, paddle-shaped hind legs and blue markings, especially in males.

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Portunidae: Portunidae is a family of crabs adapted for swimming, many with flattened hind legs. The blue crab belongs to this swimming-crab family.
Crustacean molting: Crustacean molting is the periodic shedding of an exoskeleton to permit growth. A blue crab grows by leaving its old shell and expanding before the new one hardens.
Blue crab fishery: The blue crab fishery harvests Callinectes sapidus for food and commerce. Commercial and recreational harvest make the species economically significant across its range.
Estuary: An estuary is a coastal water body where river freshwater mixes with seawater. Blue crabs commonly inhabit estuaries, whose salinity gradients shape their distribution.
Blue crab population dynamics: Blue crab population dynamics describe changes in abundance, survival, recruitment, and distribution over time. Variable recruitment and environmental conditions make abundance difficult to predict.
Decapoda: Decapoda is the order of crustaceans that includes crabs, lobsters, and shrimp. Its ten walking legs place the blue crab within this larger crustacean order.
Crab swimming: Crab swimming is locomotion driven by rhythmic strokes of flattened rear legs. The blue crab’s fifth pair of legs acts as paddles for swimming.
Chesapeake Bay blue crab fishery: The Chesapeake Bay blue crab fishery is a major regional harvest of Callinectes sapidus. The bay is a prominent blue crab fishing ground and a focus of population management.
Chesapeake Bay: Chesapeake Bay is a large United States estuary on the Atlantic coast. Its extensive estuarine habitats support a well-known blue crab population.
Blue crab conservation: Blue crab conservation comprises efforts to sustain populations and the habitats on which they depend. Harvest pressure and changing habitat conditions prompt ongoing management and restoration.