Crabs usually eat algae. Crabs are omnivorous, meaning that they will eat both plants and other animals for sustenance.Know More
Various species of crab have slightly different diets. They have a very strong digestive system that permits them to eat fungi, mollusks, bacteria, worms and even other crustaceans, such as shrimp or barnacles. In times of desperation, they have been known to eat the offal from the sea floor, which can include dead and decaying animals.
Like most omnivores, crabs require a balanced diet to maintain the highest degree of health and reach their maximum growth potential. Their systems need both the protein found in meat as well as the vitamins present in undersea vegetables to sustain quality digestion.Learn more in Crabs
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 >
At each stage of life, blue crabs are susceptible to a different class of predator, though their most consistent predator is the human being. During the larval stage, blue crabs' most common predators include small species of fish and jellyfish. In their adult, developed stage, larger fish, birds and even many species of mammals will prey on blue crabs.Full Answer >
Hermit crabs are omnivores and eat almost anything available. In captivity, they may eat raw fish, cooked chicken and a variety of vegetables, fruits and nuts.Full Answer >
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.Full Answer >