The invention discloses a method for breeding one-year-old precocious female crabs in a rice field in East China. A cross-shaped
ditch with the width of 0.3-4 m and the depth of 0.3-0.8 m is dug in the middle of the rice field,
alternanthera philoxeroides or operculate cleistocalyx water plants are planted in the
ditch, and a small amount of waterweed or
hydrilla verticillata is matched; intensively and temporarily rearing the river crab megalops in the fry pond for more than or equal to 45 days; after rice field seedlings turn green and the river crab megalopa develops to six-stage
juvenile crabs, the average
water temperature of the rice field is larger than or equal to 18 DEG C, and six-stage female
juvenile crabs are selected and put into rice field ditches; the female river crab
juvenile crabs mainly depend on aquatic plants, rice field
plankton and benthic organisms to provide bait within 20 days before breeding in the rice field, and when the number of waterweed /
hydrilla verticillata aquatic plants is greatly reduced, juvenile crab feed is fed; fattening is started after the proportion of one-year
precocious puberty individuals of the river crabs reaches 70%,
fishing is started after fattening is conducted for 20 days, and rice is harvested after
fishing is completed. By means of the method, the one-year-old
precocious puberty rate of the female crabs bred in the rice field is larger than or equal to 90%, the one-year-old
precocious puberty crabs per mu are larger than 50 jin,