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Pond Management
1. Shallow water layer hanging. In autumn, the water temperature has dropped, and generally it does not appear to have a high temperature above 30°C. The physiological activity of earthworms is still strong and is a good growing season. At this time, the earthworms should be transferred to the shallow surface. 2. Pay attention to water quality management. Through timely fertilization and water changes, the water quality is always maintained to be fat, live, tender and cool. Keep the transparency at about 30 cm, pH 7~8, dissolved oxygen 3~5 mg/l. 3. Do a good fattening. As the water temperature drops, the amount of plankton in the water decreases, and oysters consume a lot of sugar and fat during the high temperature season and need to be re-accumulated to allow wintering. If the water quality is poor, improper fertilization will weaken the corpus callosum and even cause death. Therefore, the fall can not be paralyzed and relaxed management, choose the right weather suitable dressing, early stage can be more chemical fertilizers, organic fertilizer can be the main late, so that the body fattening, to avoid the spring of next year when the water temperature rises, due to nutritional reasons and death. Organic manure is best used for feces of chickens, ducks and birds. It can be used only after 1% quicklime and fermentation before use. Fertilizer is mainly urea and superphosphate (amount ratio 1:2 or 1:3). Add water quality and sprinkling, so many times less, generally 1 kg of urea, superphosphate 3 kg. 4. Drug disinfection and drug prevention. In the epidemic season of bacterial enteritis in April-October, 1 g/m3 bleach or 15 kg/a quicklime was disinfected in the whole pool, and 1 to 2 phr tetracycline hydrochloride was added to the sickle. Injection of 2 chlortetracycline plus calcium gluconate 1 to 2 ml. Soak the carcass with 3% saline for 5 minutes and disinfect the culture rack with salt water. 5. Remove attachments. After being raised for a period of time, the cultured pearl larvae are often accompanied by a large amount of attached mud and organisms (such as algae, freshwater sponges, polycides, etc.) on the hanging net cages, net bags, and carcasses, affecting the growth of the nymphs. It must be cleaned regularly, and it should be washed every other month from April to October.