The construction of nursery stocks for feeding muddy seedlings can be done with concrete tanks and earthen ponds, but the water sources must be sufficient and free of pollution, and the light should be good. The ponds should have strong water retention, no leakage, and can completely drain the pool water. The area of ​​each seedling pond is generally 40 to 60 m2 and the depth of the pool is 70 to 80 cm. There is a set of fish pits at the center of the pond or at the drain. 15 days before the fish hatches, the pool water will be drained first. Every 100 square meters will be disinfected with 10 to 12 kg of clear lime in the clear pond, and exposed for 4 to 5 days. Then inject fresh water. The water level is about 20 cm high and a small amount of decomposed manure is applied. Drug toxicity disappears when the pool water becomes brown or green before planting. The density of seedlings is half-breeding, with 150,000 to 200,000 polycultures per 100 square meters, and polyculture of 80,000 to 100,000 tails per 100 square meters for hydroponics.
Sludge removal For the ponds that have been used for many years, exposure should be performed first. Sun exposure is very important. Generally, 30 days before the seedlings enter the pond, they must be exposed to sunlight, and the bottom of the pond should be sun-backed and can destroy the microorganisms in the pond.
Disinfection management Lime can eliminate a variety of pathogens and harmful organisms. Dianchi can be disinfected with quicklime about a week before stocking. After the lime is dissolved in water, it turns into a strong alkaline solution, which can kill the trash fish, insects, grasshoppers, muddy moss, water net algae and some soft aquatic plants that remain in the pond. It can kill parasites and pathogens. Etc., so the sterilization effect is particularly good. 1,000 kilograms of lime can be used per acre. Sprinkle directly to the bottom of the pool. Fill with fresh water after splashing. Put the seedlings into the pool one week later. Http://Content/1fa4327e-f39e-4c3e-b13a-6e1a273cac07?cType=2
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