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Crabs are caught using crab pots. The ones I've used before are cube-shaped cages with a dead fish in them to attract the crabs. They get in and can't get back out. Leave the pot out there for a day, bring it back, measure them, throw back the females, and you've got yourself a crab feast!
Anyway, blue crabs (Callinectes sapidus) are prominent in the Chesapeake Bay and the Atlantic Ocean. They have shells made of chitin, which shed from time to time and regrow. This is the difference between hard shell and soft shell crabs, the stage the crab is in at the time.
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