Shell fish are more like hermit crabs living in a shell, crayfish are like mini lobsters....Crayfish, Shellfish, Jellyfish and Silverfish are not real fish!The answer is NO.
There are many edible shellfish who live in the sand. Many people enjoy eating clams and mussels. Clams and mussels are bivalve mollusks who live in the sand. People also like crabs. Crabs are crustacean shellfish who live in the sand.
Animals such as crabs, lobsters, starfish, sea otters, and humans are known to eat shellfish. They have adapted to prey on shellfish using various methods, such as cracking shells with their claws, using tools, or suction feeding. Shellfish are an important part of the diet for many marine and terrestrial animals.
Many marine animals have a shell covering. A few of these animals are snails, shellfish, crabs, tortoises, turtles, and the like.
Hermit crabs are scavengers. Litterally. They scavange for food and they scavange for houses. When they outgrow their old shell they look for a larger abandoned shell. Their shell is not grown by them. It used to belong to a shellfish.
"True crabsare decapod crustaceans of the infraorder Brachyura," (http://en.wikipedia.org/wiki/Crab) and "many varieties of shellfish (crustaceans in particular) are actually closely related to insects and arachnids" (http://en.wikipedia.org/wiki/Shellfish).
A lot
The issue is that many people who are allergic to "shellfish" are susceptible to more than one kind. For some it may be prawns, and for others it may be crabs. These two specific types contain proteins, in a higher concentration, that cause severe allergic reactions in some people.
Octopuses eat small crabs and scallops,plus some snails, fish, turtles and other octopuses.adult octopi eat crabs, clams, snails, small fish and even other smaller octopi. they use small parrot like beaks to crush their pray.
1500
That depends on the crabs. They come in many sizes.
Ghost crabs like all crabs are decapods. This means that they have ten legs.