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The function of bleaching powder in crab breeding in earthen pond
I. Nursery pond disinfection After the winter dredging and exposing, the disinfection crab breeding pond usually uses quicklime to disinfect the bottom of the pond. To disinfect the wall with bleaching powder, 200 kg of alime per acre is used to disinfect the water (20 cm or so), and then the bleaching powder is made into a liquid at a ratio of 50:1, which is spilled onto the four walls of the earthen pond. The requirements are uniform, in place, with the hub to sterilize and dispel the enemies. 2. Disinfection of hatchery water body After the soil pool disinfection work is completed, 5 to 7 days before hatching begins, the pool water must be filtered through a sieve of more than 120 mesh (the same applies hereinafter). The bleaching powder is then added, so that the entire pool water reaches 40-60 g. cubic meter. In this way, a clean, live bait-carrying body of water can be obtained immediately after the stage I larvae emerge. III. Disinfection of Cistern In order to maintain the quality of the water in the nursery pool and prevent the entry of harmful bacteria and predator organisms into the nursery pool, a secondary filtration method is usually adopted. After the water used for sterilizing the reservoir with bleaching powder, it must pass 48 hours before it can be injected. Nursery pond. IV. Incubation and disinfection of Fengnian Insects Each hatchling must be washed and disinfected before hatching. In other words, the entire pool is washed with water and filtered water first, and then the walls of the cement and the bottom of the pool are sputtered with 200 mg/L of bleaching powder, or poured slowly from the top of the hatching pool along the walls. This can effectively prevent the egg agglomerating phenomenon, increase the egg hatching rate and the survival rate of the film. Fifth, must be disinfected, after hatching, the eggs will be hatched next year Fengnian eggs bagged with filtered water, and then placed in a concentration of 500 mg / l of bleach solution soak 5 to 6 hours, so that can not only be attached to the harvest in the harvest The eggs are cracked, accelerating the appearance of the insects, shortening the incubation time, and increasing the feed supply. In addition, a suitable amount of bleaching powder may be applied to the egg hatching water of the abundance insects in order to prevent the eggs of Artemia eggs from agglomeration and increase the hatching rate and survival rate.