1, it is best to use a covered fish tank to prevent crabs from escaping. Plant a water plant and put some pebbles and sand to simulate the wild living environment of crabs more truly. Stones should stick out of the water, so that crabs can climb up to bask in the sun and have a rest.

2. Feed crabs with bread crumbs, potato chips, steamed bread slices, rice, small fish and shrimp.

3. Change the water once a week. It is best to use natural tap water, river water and lake water. If not, use tap water that has been dry for two days. Water should not flow from behind.

Crab (pángxiè):

Animals, Arthropods, Crustacea, Mollusca, soft armor, Decapoda, Gastropoda, Anura. It is a crustacean. Its body is protected by a hard shell and breathes through its gills. Taxonomically, it is the same kind of animal as shrimp, lobster and hermit crab. Crabs, also known as Eriocheir sinensis, Portunus trituberculatus and Scylla, belong to crustaceans. There are more than 500 kinds of crabs, which can be roughly divided into two categories: one is sea crabs and the other is river crabs. Eriocheir sinensis is divided into three types: Liaohe River system, Yellow River system and Yangtze River system. Most kinds of crabs live in the ocean or offshore areas, and some live in fresh water or land. They rely on the mother crab to give birth to small crabs, and every time the mother crab will lay a large number of eggs, the number can reach more than one million. Crabs rely on the geomagnetic field to judge their own direction. China has a long history of eating crabs, which is recorded in Yi Zhou Shu by Wang Huijie and Zhou Li Tian Guan's bumper harvest man. The amount of genetic material of this kind of organism is complex and varies greatly, often as many as 100 pairs. Common crabs are hairy crabs (river crabs, hairy crabs, blue crabs) and swimming crabs.