The digestive system of the river crab includes the mouth, esophagus, stomach, midgut, hindgut and anus. The mouth is located in the middle of the lower frontal area, with one pair of large jaws, two pairs of small jaws and three pairs of jaw feet stacked to form a complex set of mouthparts. The esophagus is short and straight and passes into the expanded stomach at its end. The structure of the stomach, which has the appearance of a triangular sac, can be divided into two parts: the cardia stomach and the pyloric stomach. The midgut is followed by the hindgut, which is longer and ends in the anus.

The life of the river crab is short, in its life history through the flea-like larvae, big-eyed larvae, juvenile crabs and adult crabs and other stages, the life of the larvae need to molt 5 times to become big-eyed larvae, and then 13-15 times molt to become adult crabs, it has only one reproductive cycle in its life, reproduction end of the life will also be terminated, in general, the life span of the river crab for the age of 1-3 weeks.

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