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 ?
Improvements in fishing gear efficiency, shifts in fishing effort, environmental factors, life cycle of the species and the conditions of other fisheries have had an influence on the blue crab production (Perry and Mcilwain, 1986; Steele and Bert, 1998).
In addition to blue crabs, the occurrence of other species, such as hermit crabs and (rarely) fishes were recorded by species, but no measurements were taken and these organisms were released back into the study site.
Evaluating the efficiency and necessity of requiring bycatch reduction devices on pots in the peeler crab fishery: quantifying and characterizing the spatial and temporal overlap of activities between diamondback terrapins (Malaclemys terrapin) and the commercial fishery for peeler blue crabs (Callinectes sapidus).
ENPNewswire-August 13, 2019--Anglian Water - Operation Blue Crab gets underway in Leigh-on-Sea
(TAP)- Cooking demonstrations and a culinary competition topped the agenda of a blue crab tasting day held Sunday in Djerba-Ajim.
Blue crabs are classified in the family Portunidae and exhibit an archetypal pattern of soft-female mating behavior (Jivoff et al.
If such a relationship exists for blue crabs, those maternal characteristics could be useful predictors of offspring characteristics.
Evaluating the efficiency and necessity of requiring bycatch reduction devices on pots in the peeler crab fishery: qualifying and characterizing spatial and temporal overlap of activities between diamondback terrapins (Malaclemys terrapin) and the commercial fishery for peeler blue crabs (Callinectes sapidus), 13 p.
Blue crabs from these waterways are unsafe to eat because they are bottom dwellers that absorb cancer-causing dioxins and other contaminants in high levels.
We believe that the elaboration of management measures can inhibit the capture of blue crabs in these areas and will ensure that the stock can reproduce.
The latest global-warming apocalypse about to befall us is (drum roll): giant blue crabs. Yes, according to the Washington Post, "It is the dawn of the super crab."

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