Method for constructing shrimp nursery pond
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1. Nursery pond construction We built the nursery ponds into shrimp ponds. The ponds are rectangular in shape. The bottom of the pond is 30-50 cm above the shrimp ponds. It is tilted towards the end of the shrimp ponds so that the water can be drained. The water depth is 1.2 meters or more. According to the calculation of 2000-3000 tails per square meter, the total number of seedlings to be converted into shrimp ponds will be determined.
2. The holding tank is supplied with air in accordance with the size of the area. The air pump is generally set to 200 m2 and a 1.5-2.2 kW air pump is installed. A gas head is set every 5 m2 and the gas head is set evenly. The gas head is 5 to 10 cm from the bottom of the pool. .
3. After disinfection of the holding pool and preparation of the water holding tank are completed, the disinfection is completed (10 days in advance according to the time of advancement). The amount of lime used in the mu is 150 kg, and the whole pond is splashed with water. After 3 to 5 days, the inlet water is 50 cm. The outlet is filtered with a 60-80 mesh gauze net. After entering the water, the pH is between 7 and 9. If it is too low or too high, it must be adjusted in time.
4. After adjusting the salinity and fertilizer water into the holding pool and adding water, the trace elements needed for the human crystal salt and seedlings should be added. The salinity should be basically the same as the salinity at the seedling field. After salinity is adjusted, use two more. Bromohydantoin is disinfected once by 1 g/m3. According to the actual conditions of water quality, fertilizer water may be used. If the water quality is poor, a small amount of compound fertilizer may be used to adjust the water to a tender green color with a transparency of 25-30 cm. One to two days after entering the seedlings, 10-15 kilograms of photosynthetic bacteria are sprayed per acre to further improve water quality.
5. Seeds of stocking and density holding pools should be selected after desalination for more than 7 days, the salinity is reduced to 2 ‰, the size is 0.8 11 cm, the physique is robust, the disease-free and injury-free, the appendages are intact, and the individual size is the same. The stocking density is 2000-3000/m2, the water depth is more than 1 meter, and the water temperature is 20°C.