This eco-agricultural technology model is suitable for the promotion of sludge or mudflats in shrimp ponds. The technical highlights of the model construction are as follows:
First, shrimp pond selection and clearing
1. Water quality Water source: The main use of natural tides is that the water quality is non-polluting, the specific gravity of seawater is between 1.010 and 1.020, the water temperature is 8-31°C, and the pH value is 7.5-8.2.
2, shrimp pond bottom: There are 15 cm thick mud or silt can be, with soft mud bottom quality is better.
3, depth and area: shrimp pond area of ​​about 30-50 acres is more ideal, conducive to management. The water depth in the pond is 1.5-2 meters, and the beach surface requires a depth of 0.8-1.2 meters, and the minimum must not be less than 60 centimeters.
4. Leveling the beach surface: Before the seedlings are planted, the central beach will be loosened and flattened. The seedlings in the floodplain are controlled at about 40% of the total area of ​​the shrimp ponds, and there are shrimp and ditch around the shrimp ponds.
5, clear pool: Before stocking with 100-150 kg of lime or tea bran cake 5-10 kilograms per pond, the efficacy of about 10 days disappeared, the influent water must be filtered by 60-80 mesh sieve mesh to prevent predators Intrusion.
6, fertilizer bait: Qingchi after the new water into the 20-30 cm, 50 kg of chicken manure Mushi, urea 10 kg, the basic food within the breeding pond. Generally put 15 to 20 days after the shrimp seedlings basically do not need to vote.
Second, sowing seedlings
1, sowing time: generally in the beginning of February in the lunar calendar began seedlings, about the end of March or so. The shrimps were stocked later than the seedlings for a month or so to prevent the seedlings from being crippled.
2. Stocking density: According to the water surface of shrimp ponds, generally 200,500-300,000 seedlings or 3,000-4,000 seeds/grain seedlings of 10000-14,000 seeds per kilogram will be planted in 15~25 million grains. The prawn seedlings are planted with 1-15 thousand tails or 0.5-1 million seedlings in greenhouses.
3, broadcast seedling method: water storage seedlings, the water level is maintained at about 20 cm, evenly spread in the central beach surface, usually in the morning and evening sowing seedlings.
Third, production management
1. Adjust the water level: After the seedlings enter the pond, the water level can be kept at 20 cm; the shrimps should be filled with water in time after entering the pond; in the case of cold air and the high temperature season in summer, the water level should be adjusted upwards. In the middle and later stages of shrimp farming, the amount of water to be changed should be increased, and the amount of water should be changed by about 20% per day.
2. Water Quality Management: The water quality requirements are “fat, live, tender, and coolâ€, and the fertilizer is timely and top-dressed according to the color of the water. After the shrimps are harvested, the topdressing of urea is continued at 3-5 kg/mu to promote muddy manure.
3, feeding bait: adhere to the timing of fixed-point vote for shrimp feed, to ensure that shrimp feed; fertile water, but also provide ample food organisms loach.
4. Clearing Brassica oleracea: In early June and late October, the Brassica oleracea breeds easily in the pond and seriously affects the normal growth of the loach.
5, clearing the field to kill: constantly check the growth of shrimp and loach and whether the disease, found that the problem was solved in time.
Fourth, arrest
From early November to mid-December, the quail meat is the most plump and tender, the blood is more delicious, and the temperature is low, so it is easy to store and transport. After catching the shrimp, drain the pond water and wash it.
V. Benefit Analysis
Generally, about 200 kilograms of loach can be produced per mu of shrimp ponds, specifications are 120-400 grains/kg, 20 kilograms of shrimps are produced per mu, specifications are about 10 centimeters, mu production value is 5000-7000 yuan, profit is 2200-3000 yuan.
Shrimp and shellfish polyculture is the use of shrimp and shellfish inhabiting the water layer, food and other ecological and biological characteristics, to form a mutually beneficial ecological environment, is conducive to maintaining the ecological balance, prevent shrimp eutrophication, reduce shrimp disease Occurrence and spread to improve the comprehensive economic benefits of shrimp ponds.