1. Pond treatment: the slope ratio is below 1: 1.5, the water source is sufficient and pollution-free, the silt at the bottom is less than 20cm, and the sediment is clay, sandy soil or sub-sandy soil, with the water depth of 0.6- 1.5m, which varies from place to place. 2. Stocking: stocking 1500 crab seedlings per mu in the pond, with specifications of 120- 150/ kg. 3. Feeding: The feeding rate before June is 10- 15%, and the daily feeding rate from June to late July is 8- 10%.

First, how to breed crabs

1, pond treatment

(1) pond requirements: the slope ratio of the pond shall be controlled below 1: 1.5, with convenient water intake and drainage, abundant water sources, no pollution, silt at the bottom not exceeding 20cm, clay, sandy soil or sub-sandy soil at the bottom, and water depth of 0.6-1.5m..

(2) Set several mounds slightly above the water surface in the pond, transplant aquatic plants on the mounds, and transplant aquatic plants such as duckweed, red duckweed, water hyacinth, water hyacinth, black algae and Ceratophyllum in the pond.

(3) About 65,438+05 days before stocking crabs, 75 kilograms of quicklime slurry was used for each mu of pond, and the whole pond was splashed.

2. stockings

(1) Crab seedlings require neat specifications, complete steps, strong physique and strong vitality.

(2) Before stocking, soak the crab seedlings in water for 2-3 minutes, then take them out and let them stand for 10 minutes, and repeat this for 2-3 times, and then stock them after they adapt to the water temperature.

(3) Crab fry 1500 per mu of pond, with specifications of 120- 150/ kg.

Step 3 feed

(1) The feed ratio is 40% of animal concentrate, 35% of aquatic plants and 25% of other plant feed.

(2) The feeding amount before June was 10- 15% of the crab's weight. From June to late July, the daily feeding amount is 8- 10% of the crab's weight. From August to the end of September, the daily feeding amount is 6-8% of the crab's weight.

(3) Feed twice a day, specifically at 8-9 am and at night, in which the feeding amount at night accounts for about 60-70% of the whole day's feeding amount.

Step 4 manage

(1) The ph value of water should be controlled between 7.8 and 9.

(2) The transparency of water is about 40-50 cm.

(3) Dissolved oxygen should be above 4 mg/L, and chemical oxygen consumption should be below 4 mg/L. ..

(4) The ammonia nitrogen content shall not exceed 0.4 mg/L, and the hydrogen sulfide content shall not be lower than 0. 1 mg/L. ..

(5) The color of water should be light green or light brown.

Second, how long is the crab breeding cycle?

1. Crab culture is generally divided into two stages, namely, raising crabs and raising crabs. It takes about 2 months to cultivate Eriocheir sinensis, and 9- 10 months to raise Eriocheir sinensis to adulthood.

2. Crabs need to go through eight stages, such as fertilized eggs, flea larvae, megalopa larvae (crab seedlings), young crabs (bean crabs), young scorpions (buckled crabs), yellow crabs (adult crabs) and parent crabs, and need to shed their shells (skins) for about 18 times, in which the stage from flea larvae to I crab larvae is molting, and I crab larvae.