blue crab

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blue crab,

common name for a crustaceancrustacean
, primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crustacean species are marine, but there are many freshwater forms. The few groups that inhabit terrestrial areas have not been particularly successful in an evolutionary sense; most require
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, Callinectes sapidus, found on the S Atlantic and Gulf coasts of North America. The blue crab is a member of the family of swimming crabs known as the Portunidae and is characterized by a broad, semitriangular carapace (shell) covering the thorax, by a narrow abdomen tucked under its body, and by five pairs of appendages called pereiopods, of which the first two bear large claws (chelae) and the last two are flattened paddles modified for swimming. It is the most common edible crab of the Atlantic coast, and several million pounds are fished commercially by trapping or trawling each year. It is sold both as the hard-shell variety and as the familiar delicacy known as the soft-shelled crab. In the hard-shell form, the crab is in an intermolt phase (between molts) and the exoskeleton is fully hardened (sclerotized). In its soft-shell stage, the crab is in the phase just after the molt but before the exoskeleton has hardened. Since, in nature, the crab retires to secluded areas at the time of the molt and is thus difficult to collect, commercial fishermen collect the crabs at the so-called peeler stage, which occurs two to three days before the molt. The crabs are then held in pens, on floats in the water, until just after the molt, when they are marketable. The ovaries of the female begin to develop only after mating has taken place. The female carries the young under her abdomen until they hatch as tiny larvae, which are only 1-25 in. (0.1 cm) long. The crabs molt many times and grow to 7 in. (17.8 cm) in about 200 days. Blue crabs are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, subphylum Crustacea, class Malacostraca, order Decapoda, family Portunidae.
References in periodicals archive ?
Differential growth and moulting characteristics of the blue crab Callinectes sapidus Rathbun.
Importance of low salinity areas for juvenile blue crabs, Callinectes sapidus Rathbun, in river-dominated estuaries of southeastern United States.
Biology of blue crab Callinectes Sapidus Rathbun, in St.
Aquaculture of the blue crab Callinectes sapidus Rathbun can provide a source of crabs to enhance natural stocks and be a source of peeler crabs for the soft crab industry.
Synopsis of biological data on the blue crab, Callinectes sapidus Rathbun.
Chelal characteristics and foraging behavior of the blue crab Callinectes sapidus Rathbun.
Synopsis of biological data on the blue crab Callinectes sapidus Rathbun.
Female blue crabs, Callinectes sapidus Rathbun, were collected at night during July through October 2002 and 2004 from a tidal flat near the Duke University Marine Laboratory in the Newport River Estuary, North Carolina (34[degrees]43'N; 76[degrees]40'W).