Cultivation techniques of juvenile shrimp

Cultivation requirements

When the young shrimp leaves the mother, it is usually carried out in the juvenile shrimp pond. after all the young shrimp leave the mother, the parent shrimp will be removed, leaving the young shrimp to breed. At this time, the average body length of the young shrimp is 0.8 cm. After 15 days of cultivation, the body length can reach 2.4-3 cm. For farmers to carry out adult shrimp culture and production.

1. Requirements of cultivation pool

The cement pond with an area of 20-40m2 and a water depth of 0.6-0.8m is the best for juvenile shrimp ponds, and the soil ponds are also acceptable, but the newly built cement ponds should be dealkalized first, which should be close to the water source, good water quality, convenient injection and drainage, build escape prevention facilities and disinfect the ponds (the method is the same as that of parent shrimp cultivation). After disinfection, fermented organic fertilizer 500kg/ mu was applied to cultivate plankton to feed the juvenile shrimp. At the same time, tree roots and bamboo tubes are set up to provide habitat, molting and concealment for young shrimp.

2. Water requirements

① water quality: generally use river water or well water, the water quality should be fresh. At the inlet, filter the water with a sieve to prevent insects, aquatic animals (such as water centipedes), small fish and shrimp and eggs from entering the pond. During the cultivation period, depending on the residual feeding of sewage and the condition of water quality (such as ammonia nitrogen and other three-state nitrogen on the high side), it is necessary to absorb sewage and change water regularly in order to maintain good water quality.

② water temperature: the suitable range is 27 ℃-29 ℃, and the change range can not exceed 2 ℃. If the water temperature is lower than 20 ℃, the growth rate will be reduced, which will seriously affect the survival rate, so it is necessary to keep the water temperature relatively stable during the whole cultivation period.

③ dissolved oxygen: when the young shrimp leaves the mother, the breeding pond should be inflated continuously throughout the day to make the dissolved oxygen in the water sufficient.

④ PH value: the pH value of the water used for cultivation should be controlled at 7-8.5. if the water quality is slightly acidic, quicklime can be used to adjust the PH value. In breeding farms that use tap water for small-scale production, baking soda can be used to adjust the PH value.

2. Cultivation technology

The stocking amount of juvenile shrimp is generally 150-230 / m2, which should be consistent with the specification of shrimp fry in the pond, and release in sunny morning or cloudy day. Soymilk can be fed 3-4 times a day in the first week after stocking; from the second week, animal feeds such as small fish and shrimp, clam meat, earthworms and silkworm pupae are mainly fed, properly mixed with corn, wheat and paste feed, once in the morning and once in the evening, 40% of the daily feed in the morning, 0.25-0.40kg per 10,000 young shrimp in the early stage, and about 10% of the shrimp weight later. During the culture period, the water was changed once every 10 days, and the raw lime water was sprinkled every 20 days with a concentration of about 20g/m3 to regulate the water quality. After 25-30 days of cultivation, the body length of young shrimp can reach 3cm, and then it can be transferred to adult shrimp culture.