River shrimp can be spawned 3 to 4 times a year. mid-April to early May, the water temperature of 15 ℃ or more, sexually mature female shrimp will begin reproductive molt, the entire molt process can be completed in about 2 minutes. After molting female and male shrimp abdomen relative mating, mating time lasts about 5 minutes. After mating 3 to 10 hours after the female shrimp holding eggs, egg color is yellow. Holding the amount of eggs with the size of the parent shrimp varies, the individual large hold more eggs, the individual small hold fewer eggs, the variation in the 500 to 2000. During the female shrimp eggs, the first pair of footsteps often into the egg block between the removal of impurities and necrotic eggs, swimming feet often swing to drive the water flow, so that the eggs get enough oxygen. Egg hatching and water temperature, dissolved oxygen, transparency and other water quality factors. Below 35 ℃, the higher the water temperature, the shorter the incubation period, generally 11 to 15 days. Eggs developed into young shrimp after hatching, 1 tail of shrimp parents ultimately "hold children" 50 to 200, that is, the breeding survival rate of about 10%. Juvenile shrimp from the mother, soon into the first molt, each molt after its growth rate accelerated significantly, the general development of adult shrimp need to have more than 4 times the molt process.