however, the claw is broken in the wrong place, more blood is lost and the crab's chances of survival are much lower. Each time the crab molts, the new claw grows larger. The crab only molts at night or in night-like conditions due to the crab being extremely vulnerable to predators without the protection of its shell. If the crab is becoming too large for its shell and the sun is up, the crab releases a hormone from a gland located on one of its eye stalks called the x-organ. This hormone prevents the crab from molting from its shell until it finds a safe place to molt or it has become dark enough outside to molt in safety. Fishery The Florida stone crab is usually fished near jetties, oyster reefs or other rocky areas, just as for blue crabs. The bodies of these crabs are relatively small and so are rarely eaten, but the claws (chelae), which are large and strong enough to break an oyster's shell, are considered a delicacy. Harvesting is accomplished by removing one or both claws from the live animal and returning it to the ocean where it can regrow the lost limb(s). To be kept, claws must be long, measured from the tips of the immovable finger to the first joint. In 1978, and in the Everglades National Park Research Center, wild caught crabs were kept in an aquarium for the specifics of testing mortality rates of declawed crabs. Mortality rates of 47 percent for doubly declawed and 28 percent for single declawed crabs were evident. In the 2011 season the mortality rates had increased to 62.9 percent and 40.8 percent respectively. In retrospect, 20 percent of landed claws are regrown. In the United States, Florida stone crabs are legal for harvest from October 15 until May 15. The catch varies from year to year, ranging between 2.0 and 3.5 million in the period 1982–2009, overwhelmingly from the Gulf coast (as opposed to Atlantic coast). This is believed to be the maximum amount possible, given current environmental conditions, regulations, and practices. The number of traps tripled between 1989–1990 and 2009–2010 without haul increasing (hence having a very low catch-per-trap level). However, due to fisheries management, the haul is believed to be stable, as sufficient spawning happens. Claws are sold by size, generally in four sizes: medium, large, jumbo, and colossal. The top buyer of