crabs are used for food and medical
no
Catching and eating
It is used for treating diseases like cancer.
People use crabs for various purposes. They are a popular seafood delicacy, often used in recipes for dishes like crab cakes, crab soups, and crab legs. Some people also keep pet crabs, such as hermit crabs, as pets or for educational purposes. Additionally, some crabs are used in medical research for studying various biological processes.
Wolbachia
Some types of crabs I know of are fiddler crabs, hermit crabs and horseshoe crabs.
Mostly asian shore crabs, Mud crabs,Rock crabs, Donut Crabs and Spider Crabs. I believe there are no freshwater varieties.
Horseshoe crabs are marine arthropods of the family Limulidae. They occasionally come onto shore to mate. They are commonly used as bait and in fertilizer
Hermit crabs came from, tropical areas. They are used to oceans, so any place warm and hot and tropical, like the Bahamas.
rock crabs are type of crabs.
The three I know of are fiddler crabs, hermit crabs and horseshoe crabs.
Crabs are creatures seeking warmth, keep them in a shaded aquarium, feed them weeds till they can be used for making the crab curry.