Crab feeding management, river crabs like to eat fresh ingredients. Therefore, daily feed management prohibits those feeds that have been stored for a long time and deteriorated. At present, it is still necessary to give priority to meat feed, and use some nutritious vegetarian food in moderation, especially plant feed, to ensure good water quality in the pond. The amount of materials used should depend on the change of climate and temperature. In hot summer, 1 feed twice. The exact quantity depends on the weight of the river crab. If there is unfinished residue, it should be salvaged immediately to avoid deterioration and influence on water quality.

Crab, crustacea, belongs to mollusca, DECAPODA.

Crab's body is divided into head, chest and abdomen. The head, chest and back are covered with head and breastplate, and the shape varies from species to species. There are 1 and 2 pairs of antennae in the middle of the forehead, and compound eyes with stalks on the outside. The mouthparts include 1 pair of big jaws, 2 pairs of small jaws and 3 pairs of jaws. There are five pairs of chest feet on both sides of the head breastplate. The abdomen degenerates, flattens and bends on the ventral surface of the head and chest. The male abdomen is long and narrow, mostly triangular, and only the first two pairs of appendages are deformed into connectors; The female has a broad abdomen, and there are 1 pairs of double-branched appendages in the 2nd to 5th sections, which are densely covered with bristles for holding eggs. Most crabs are marine, with the most species in tropical shallow waters.

A small number of crabs grow and breed completely in fresh water, and most of them live under rocks in mountain streams. There are also a few crabs, such as ground crabs, which can adapt to land life, make holes in wet mud holes and migrate to the sea when breeding. Most crabs are omnivorous. Some crabs are carnivorous. For example, Portunus can prey on fish, shrimp and mollusks. A few crabs, such as window crabs, scrape or filter algae and organic debris.