Saltwater crabs are primarily carnivorous, preying on animals that live on or near the ocean floor. The most common species of ocean-dwelling crabs feast largely on small fish, worms, squid, snails and animal matter found on the ocean floor. Most crabs also eat their own species, some going as far as to deliberately trap them, according to USA Today.
There are more than 4,000 species of crabs, and the majority live on the ocean floor where they find an environment rich in prey, such as smaller fish or crustaceans. Crabs may also supplement their diets with plankton, algae, gastropods and snails.
The most common types of saltwater crabs are king crabs, Dungeness crabs, snow crabs and blue crabs. The diets of each variety of crab vary slightly. While crabs are primarily carnivores, the blue crab feasts on live plants along with sea-dwelling animals. While all crabs eat other types of crabs, the snow crabs, blue crabs and Dungeness crabs actually trap and eat other crabs of their own specific type.
When fully grown, the largest species of crab, the king crab, relocates to deeper waters, where it hunts larger prey. These crabs, which can live up to 20 years, dine on larger crustaceans that include clams, mussels, barnacles and sea urchins.Learn More
Shore crabs feed primarily on invertebrates such as molluscs, clams, crustaceans and worms, but they eat practically anything they can get a hold of, including the remains of dead organisms. Their voracious appetites have lead to the regional decline of several species. Shore crabs are an invasive species due to their easily accomodated diets and widespread dispersion.Full Answer >
Crabs have a split nervous system that consists of a dorsal ganglion, which is the crab's brain, and a ventral ganglion. A circumesophageal ganglion connects the two parts. The crab's brain is situated between its eyes, while the ventral ganglion is underneath its organs and between its legs.Full Answer >
The orange stuff in crabs is eggs. Crab eggs are also known as roe or coral, and the presence of the eggs is an indication that the crab is a female. Crab coral is a delicacy often used in recipes.Full Answer >
All true crabs have 10 legs that are arranged in pairs. The front-most pair is modified into a pair of claws or pincers, and the other four pairs are used for locomotion. For some swimming crabs, the hindmost pair of legs is flattened to form paddles.Full Answer >