First, shrimp pond selection and clearing
1. Water Quality Water source: No sewage is injected near the shrimp ponds. The specific gravity of seawater is between 1.010 and 1.022, the water temperature is 5°C-35°C, and the pH value is 7.5-8.3. Water sources are mainly based on the use of natural tides.
2. Terrain and sediment: It is required to have a flat topography and a small slope, so as to facilitate flooding and drainage. The bottoms are preferably hard clay or sand mud.
3. Depth of area: The area should be around 100 mu. The depth of the pond should be about 150-250 cm, the water level should be 100-150 cm, and the minimum requirement should be 60-70 cm.
4. Trimming: The inner tidal flat is selected for dicing. Generally 3-5 meters wide, 50-80 centimeters high, and 60-70 centimeters apart, for planting and daytime management. About 10 days before transplanting, raise the earthworms and soak them in shallow water for 2-3 days. After the draining, drain the water and wipe the light to prevent the growth of Enteromorpha, which will facilitate the attachment and growth of seedlings. In general, the crickets in the crickets and the crickets in the crickets are broilers. It is advisable to use 20% to 25% of the shrimp pond area.
5. Clear pond: Before the stocking of shrimps, the silt, residual baits and the dried beach surface in the pond should be removed. Afterwards, the water storage should be used for drug disinfection. The tea cakes should be 20ppm or quicklime 350ppm or bleaching powder 60ppm. After the shrimp ponds have been dredged, decontaminated and poisoned, they are filtered through 60-80 mesh sieves and then into the washing pool to prevent the entry of various pests.
Second, sowing seedlings
1. Sowing time: generally starts in the middle and early March of the lunar calendar, and ends in early April. Usually after the first shrimp, it can prevent shrimp damage.
2. Stocking densities: 30-50 kg of seedlings of 800-1, 000 grains per kilogram are generally stocked in acre, and larvae are recommended to be stocked at 1-15,000 per acre.
3. Seeding method: When sowing the seedlings, leave 10-20 cm of empty land on both sides of the earthworm for the seedlings to move burrowing so as not to enter the ditch. Water storage seedlings, water level 15-20 centimeters, seedlings strive to be uniform; It is not appropriate to broadcast seedlings in the hot sun and heavy rain.
Third, production management
1. Fertilize the bait: After the seedlings are sowed or before the stocking of the shrimps, feed the bait plankton. Mushi manure (chicken manure) 50 kilograms, urea 10 kilograms, so that the water pool into a yellow-green or light brown. After the shrimps are released, look at the color of the water and apply top dressing once every half month. Apply urea and superphosphate mixed fertilizer 1-1.5ppm (ratio 2-3:1). Dissolve and spray on the surface of the water. As the water temperature rises in July and August, the fertilization in the pond is stopped and fertilization is stopped.
2. Timely transfer of water: 15 to 20 days after stocking, shrimps should be gradually added with water, and new water should be added in time after heavy rain. In the middle and later stages of breeding, the amount of water to be changed should be increased. After the shrimps are harvested, the water level will drop to 30-40 cm.
3. Clearing Brassica oleracea: In early June and late October, Brassica camphora can be easily propagated in Brassica camphora, affecting the normal production of seedlings. You can choose morning or evening during the tide to dry and pick up the fish.
4. Shrimp Pond Feeding: Shrimp is mainly made of live or artificial baits, and feeds on plankton in filter-feeding water. It adheres to fixed-point feeding at regular intervals to prevent under-feeding of shrimp to grazing seedlings, affecting the growth of seedlings. survive.
5. Clearing the fields: During the period of July-August, choose to drain in the mid-afternoon tidal period and take 2-3 hours within 10 to 15 ppm of tea cake poison fish (enemy). After 1-2 hours, follow the rising tide as soon as possible. Note for fresh seawater, and timely replacement of the broken sieve; every half a month feeding oxytetracycline or furazolidone baits for 2-3 days to prevent shrimp disease.
Fourth, arrest
Seedlings are cultured for 7-8 months. After the shrimps are harvested, fertilizers can be used to promote fertilizers from the half-month to the month of January.
The principle of polyculture of shrimps and shellfish is to bred through the difference in physiology and ecology between shrimps and shellfish. The characteristics of shellfish filtration are used to make full use of shrimp baits, plankton, benthic organisms and micro-organisms, and shrimp and shellfish polyculture. It helps to regulate the ecological balance, promote the growth of all varieties, improve and purify the water quality, and achieve the purpose of mutual benefit and symbiosis. Yi County, Jiangsu, China In 1999, the mixed area of ​​shrimp and mottled plover was 5,700 hectares, 4800 tons of variegated pods were harvested, and 125 tons of prawn were harvested. The economic benefits and social benefits were achieved: The ecological agricultural technology model is suitable for use in hard mud or sand mud sediments. Shrimp pond mudflat promotion, the technical points are as follows: