Young shrimps that have just left the mother's body through artificial breeding are about 25px in length, small in size, weak in physique, weak in adaptability to the external environment and ability to resist and avoid enemy harm, and the survival rate is mostly less than 30%. Using the natural bait of the rice field itself, the young shrimps that just left the mother's body were put in. After about one month's cultivation, the shrimps with a size of about 25px could be cultivated into shrimps with a body length of 3 ~125px. This is the most direct, simple and effective method for crayfish fry cultivation. The techniques for cultivating crayfish fry in paddy fields are as follows:

First, prepare rice fields

Build a culture area, and use 20 mesh to enclose a young shrimp culture area in the shrimp ditch of the rice field. The shrimp species cultivated in each mu of young shrimp culture area can be cultivated in 20 mu of rice field. Controlling the water level, the water level in the shrimp ditch is controlled at about 1000px, and it is kept in a relatively stable state, providing an activity place for shrimp seedlings.

Planting aquatic plants, including submerged plants and floating plants, the area of submerged plants accounts for about 50% ~ 60% of the cultivation area, and the area of floating plants accounts for about 40% ~ 50% of the cultivation area, and they are fixed with bamboo baskets. Fertilization water quality: 7 days before the young shrimp are released, farmyard manure (such as pig manure, cow manure, chicken manure, etc.) which has been decomposed and fermented is applied in the cultivation area, and the dosage per mu is100 ~150kg, so as to cultivate palatable natural bait organisms for the young shrimp.

Second, put in young shrimps

Transportation method: the young shrimps are transported with oxygen and water in double nylon bags, and the young shrimps in each bag are 0.5 ~110,000 according to the distance. The stocking density is determined according to the biological density and species of bait in rice fields. Generally, young shrimp1500,000 ~ 200,000 fish are put into each mu. Time, the release time is September ~10, which should be carried out in sunny morning, evening or cloudy day to avoid direct sunlight, high temperature and long-distance transportation and reduce the physical consumption of young shrimp.

Third, feeding management

Feeding: on the first day of feeding, young shrimps should be fed with animal bait such as minced fish, minced snail and mussel meat, and leftovers from slaughterhouses. Feed it three or four times a day, except for 1 time in the morning, afternoon and evening, and if possible, it should be increased at midnight. The daily feeding amount is generally 5% ~ 8% of the weight of young shrimp, and the specific feeding amount should be flexibly grasped according to the weather, water quality and shrimp feeding situation. The distribution of daily feeding amount is as follows: 20% in the morning, 20% in the afternoon and 60% in the evening; Or 20% in the morning, 20% in the afternoon, 30% in the evening and 30% at midnight.

Inspection, inspection, morning and evening inspection, observation of water quality changes. During the cultivation of young shrimps, the water transparency should be 30 ~1000px, and when the specifications of young shrimps reach 75px, the purse seine can be removed and transferred to the adult shrimp paddy field for cultivation.