In order to grow, a blue crab must shed its shell and form a new one. As crabs shed, they emerge from their old shells with a very thin, soft shell which hardens after several days. These softshell crabs are delicacies that are eagerly awaited by crab lovers each season. The shedding process is repeated up to 25 times during a crab s life span, which seldom exceeds two to three years. When environmental conditions are favorable, large numbers of crabs can be produced from a relatively small spawning stock.
Females can spawn twice in their life-cycle and release up to two million eggs at a time.
If a crab loses a leg or claw, it is able to regenerate, or grow a new limb to replace the one lost. In addition, the crab possesses the power to throw off limbs voluntarily. If a crab is seized and held by a leg, it may release that leg and escape. The leg is regenerated during the next shedding cycle. To manage the blue crab resource, there are regulations to govern both recreational and commercial crabbers.