Description. Blue Crabs. Crabs are crustaceans with five pairs of legs. If the crab is flipped over, the shape of the folded surface of the belly (the apron) reveals the animal's approximate age and sex. Thinner legs require less oxygen, hence less energy. The Blue Swimmer Crab is a popular food in Australia and is targeted and caught in large numbers by professional and recreational fishers. The blue crab's incubation time is 14-17 days, which is when the eggs are brooded. The scarlet king crab lives even deeper than the golden king crab, and has legs that are much thinner in respect to their length. Blue crab larvae have a salinity requirement of at least 20 ppt, and show poor survival below this threshold. Habitat: Shallow and brackish waters, eelgrass beds, muddy bottoms. Striped bass, red drum, catfish and some sharks depend on blue crabs as part of their diet. Monitoring blue crab population levels and range shifts to gain knowledge on how changing conditions may be impacting crab populations is a useful first-step adaptation strategy for this species. More information about adaptation strategies. Blue crabs are sexually dimorphic.Males are slightly larger than females and have bright blue claws. It was first seen off Egyptian waters in the 1940s, but reports of blue crab sightings in Italy, Israel, Greece, and Turkey have been made, too. Females have red-tipped claws. This creature itself is actually very unique shellfish and with great taste, this creature has also become one … The sharks, striped bass, eels, drum, whiptail stingrays, conose rays, and trout are considered as some of the natural predators of blue crabs. Florida Fish and Wildlife Conservation Commission Species Profile The blue crab's carapace (or shell) is about 7 inches (17.8 cm) wide and 4 inches (10.2 cm) long. They drink water from dew and the ground, they get it from food, and even from water vapor. Adult male crabs live in the low-salinity waters upstream, while adult female crabs live in the higher-salinity waters near the mouth of the estuary. Stowaway blue crabs on ship ballasts have even showed up in the Mediterranean. Juvenile and adult blue crabs serve as food for fish, birds and even other blue crabs. Blue crabs live in estuaries along the United States' Atlantic and Gulf coasts. Females have red-tipped claws. There are many crab behavioral adaptations for survival that this shellfish do since they need to be able to fight their predators and live in their natural habitat. They also store water in their bladder, blood, and specialized pockets throughout their bodies. Seasonal appearance: Early spring to late fall. The first pair is modified as pinchers and the last four pairs are walking legs. Blue crabs are subject to predation throughout their life cycle and are particularly susceptible when they are soft during the molting process. The megalopae and juvenile crabs are consumed by various fishes and birds, as well as other blue crabs. Additional Resources. Facts about Blue Crabs 8: the natural predators. Land crabs have even more adaptations to prevent drying out. There, however, the crab is invasive. Blue Crab (Callinectes sapidus)Color: Olive green carapace, with brilliant blue claws. As larvae, they are vulnerable to fishes, jellyfish and other planktivores. Blue crab larvae are part of the Bay’s planktonic community, serving as food for menhaden, oysters and other filter feeders. During this time females migrate to the mouths of estuaries so that larvae may be released into high salinity waters. They are mobile predators whose salinity requirements change at different stages in their lives. 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