Yes they do but they are not very big, It depends on how big the crayfish are.
Carapace
Chitin and some calcium
A rostrum on a crayfish is an extension of its shell. This part is used for extra protection.
The "shell" of the crayfish, or rather its exoskeleton, is composed of the polysaccharide chitin and some lipids. There are also some calcium salts in the exoskeleton of the crayfish, which gives it its firmness.
An exoskeleton - i.e. a shell.
After it molts, a crayfish needs some time to grow a new and larger shell. During this time it has no shell to protect it from attack, therefore it hides.
Crayfish shed their shell, a process known as molting, typically in the spring and summer when water temperatures are warmer. This process occurs several times a year, depending on the age and growth rate of the crayfish. During molting, crayfish absorb water to expand their bodies, allowing them to break free from their old exoskeleton. After shedding, they are vulnerable until their new shell hardens.
hard shell, sharp claws aquatic
Crayfish are crustaceans, and therefore have a shell-like outer covering called an exoskeleton.
The crayfish shell, or exoskeleton, is primarily composed of chitin, a tough, flexible polysaccharide that provides structural support. This chitin is often mineralized with calcium carbonate, which adds strength and rigidity to the shell. Together, these materials help protect the crayfish from predators and environmental factors while allowing for growth through molting.
Nope. They have a shell, known as an exoskeleton. Means bones are on the outside (the shell takes the place of bones)
Yes, a crayfish can turn blue after molting due to the presence of a pigment called astaxanthin, which is usually masked by other pigments in their shell. During the molting process, the crayfish sheds its old exoskeleton and the new shell is initially soft and may appear blue before it hardens and the pigments stabilize. This blue coloration is often temporary, and as the shell hardens, the crayfish may return to its typical coloration.