Shrimp pond polyculture technology

The comprehensive utilization of the shrimp ponds for a variety of optimization breeding has been valued by the majority of shrimp producers. In recent years, the use of shrimp ponds in Tongan District for polyculture of Japanese prawns and calyxes has developed rapidly in the autumn and winter, with significant economic benefits. The following is a brief description of the shrimp pond mixed-cultivation technology:

I. Pond selection

1. Shrimp pond conditions: In addition to the basic requirements for general shrimp culture ponds, the polyculture shrimp ponds also require convenient drainage and irrigation. The bottom of the pond is a sandy bottom, with a sediment content of more than 60% and a pool depth of more than 1.2 meters.

2. Water quality conditions: The specific gravity of seawater is between 1.010-1.022, the pH is stable at 7.8-8.4, the ammonia nitrogen content is less than 0.6mg/L, the bottom sulfurous ammonia is lower than 0.01mg/L, and the inner bay with fresh water injection is particularly good .

Second, preparations before stocking

1. Decontamination and Turning: After the shrimp ponds have been harvested in the early season, they should start cleaning the soil and plowing. Remove the surface sludge first, and then turn the entire pond to a depth of 15-25 cm (the best condition is to sprinkling new sand along the beach surface around the shrimp pond) to improve the condition of the beach surface and to facilitate shrimp production. Bay grows.

2. Shrimp pond disinfection: Advanced water immersion before shrimp ponds are placed, followed by disinfection with 1.5ppm bleaching powder, 5kg/mu tea cakes to kill predator organisms, and the treated shrimp ponds are fed through a 60-mesh screen.

3. Cultivate basic baits: about a week before putting the seedlings into the water, fertilize and cultivate the basic biological feed, the water level is maintained at about 60 cm, and each time urea is used as 1 ppm, depending on the situation of the water, the number of fertilization can be flexibly adjusted.

Third, the polyculture mode and position in the flower pods play area requirements can only account for about 20% of the total area of ​​shrimp ponds, generally not more than 25%, otherwise, the food supply is not expected to feed, shrimp, shellfish growth is unfavorable. The sowing seedlings were planted on the side beach 2 meters away from the pool shore.

Fourth, seed stocking

1. Time for seedlings investment: Japanese shrimps reared in autumn and winter can be planted at the same time with calyx. The time of seedlings is generally from September to October.

2, the number of seedlings and specifications: Japan shrimp put 0.8 cm seedlings per acre 2-30000, can be divided into one to two batches of seedlings. The seedlings of the calyx must be large, robust, and robust. The seed size is 500-800 capsules per kilogram and evenly sowed on the surface of the beach that has been turned beforehand.

V. Daily management

1, plus water: shrimp, shellfish after stocking, add filtered water 5-10 cm a day, the water transparency is maintained at 30-40 cm, plus water to supplement the natural food, keep fertilizer and water to ensure that the water is fresh.

2, feeding amount: Japanese shrimp in the autumn and winter food intake is very small, so in addition to the basic food, supplemented by feeding the right amount of high-quality compound feed, you can meet the growth needs.

3, fertilization: During the entire period of stocking, still need to apply fertilizer, usually about 7 days.

4. Observe diligently: It is imperative to inspect the feeding and growth of shrimps and shellfish every morning, evening, and evening. Regularly check the water quality and find abnormalities in time to take appropriate measures.

5, timely harvest: Japanese shrimp before and after the Spring Festival to meet specifications can be harvested. The calyx should be harvested before May, when the harvest size is generally 150-200 grains/kg, the rate of recovery is about 70%, and the input-output ratio is 1:3-5.

Respiratory & Digestive System Drug

Ambroxol Injection,Cimetidine Injection,Xylometazoline Nasal Spray,Hyoscine Butylbromide Injection

NINGBO VOICE BIOCHEMIC CO. LTD , https://www.pharma-voice.com