1. Clear Pond (usually conducted one month before stocking) Clear Pond is a key part of the successful implementation of the aquaculture plan and must not be taken lightly. No matter how tight the time is, the workload is still greater, but it still needs to be cleared. Especially for old ponds. First, at least the surface of the mud (usually 20-30 cm) cleared, and the second is to use disinfectants to kill the pond within the organism (including bacteria, viruses, etc.). At present, many farms use dredge pumps to dredge, but when they are used, I see that the effect is not ideal. If possible, then manual dredging should be done as far as possible. Clear Pond's commonly used drugs are: quicklime, bleach, tea cake, fish rattan and so on. Quicklime is the most commonly used and best-acting disinfectant. It can oxidize the reducing layer in the bottom of the pool. The calcium carbonate produced can also regulate the pH of the water body and stabilize the water quality. It can also improve the soil structure and enhance the pool. The bottom of the breathability, the residual pathogens and other harmful organisms have a strong ability to kill. The dosage is 60--100 kg/mu. Bleaching powder (containing 30% - 35% of available chlorine) has a strong lethal effect on bacteria and protozoa. It kills all living things and can prevent diseases. It is generally used at a concentration of 40--60ppm, or it can be used directly on the beach. surface. Tea cakes are mainly used to kill fish and can also be used in the breeding process. The tea cakes can be crushed or soaked in a bucket for more than 6 hours. The tea cakes are sprinkled in the pool at a dosage of 15-20 grams per cubic meter of water. Kill fish after 1-2 hours. At the same time the residue of the tea cake can also be fat and water. Because of its effect on heme, it cannot be used if there is a mixture of cultured grasshoppers and raccoon in the pool. Fish rattan is also a disinfectant derived from plants, mainly killing the enemy fish, commonly used concentrations of 2 - 3ppm. When using a variety of disinfectants, please carefully read the instructions for use, especially the amount and failure time. 2, fertilizer and water (usually 10-15 days before the release) until the disinfectant toxic loss (washable pool 2 - 3 times, wash the pool should generally use 40 - 80 mesh sieve mesh filter sea water), water 40--60Cm, applying N fertilizer 20ppm urea, or fermented organic fertilizers such as chicken manure and other fertilizer pool, so that the pool water is yellowish green, in order to cultivate the basic bait, or wait for the seedling source situation to put in some shellfish, such as flower buds As a mixed breed, wolfberry, etc., in order to facilitate the next step of bottom control or as a living spare bait.
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