Fish management, clear pond. After the autumn, all the fish will be transferred out of stocking, and the original pond will be disinfected with 125kg to 150kg of lime per acre. 5 days to 7 days after the clear pond, Mushi fully fermented pigs, cow dung 500 kg to 750 kg or large manure 100 kg to 200 kg, in order to fertilize the water quality. 7 days after fertilization, the fish species can be returned after treatment disappears. Second, divided education. Because large-scale fish species have large food intake and strong grab power, if small-scale fish species are placed at the same time, small fish will not receive enough feed and their physical quality will decline. Therefore, it is necessary to keep the specifications of the fish species in the same pool. Fish species larger than 16 cm can be placed in adult fish ponds, and small fish species need special pool cultivation. Third, thin. In order to increase the survival rate of fingerlings in winter, they should be reasonably diluted according to the size of the water surface, depth of water and other conditions. The depth of 1.5 meters of fish ponds, acres of 7 cm to 8 cm fish species 4000 to 6,000, rearing to the end of the body up to 13 cm to 17 cm. Specific stocking ratio, fertilizer ponds: 55% to 60% of carp, carp 15%, grass carp 10%, carp 10%, carp, carp, carp, etc. 5% to 10%. Thin ponds: 45% to 50% of grass carp, 20% of carp, 5% to 10% of carp, 10% of carp, 5% to 10% of carp, carp, carp, etc. Before fish ponds, the fish body was first washed with 4% saline solution for 5 minutes to 10 minutes. The best conditions for the grass carp were to be injected with the inactivated vaccine. Fourth, feeding. In order to use grass carp as the main species for carp and carp species, fertilization should be given priority, and feeding should be supplemented. In addition to the use of basal fertilizer, fertilizer is applied once every 5 days to 10 days, and 80 to 100 kilograms of human and animal manure per acre is applied, or 2 to 2.5 kilograms of urea are applied, and 3 to 5 kilograms of superphosphate are used. The transparency of the pool water is maintained at 25 centimeters or so. At the same time, 2 kg to 4 kg of intensive feed per 10,000 fish are consumed daily. For grass carp, 60 kg to 90 kg of fodder per 10,000 grass carp before consubstantial feeding. In order to raise grasses and fish species, fish ponds with oysters and oysters should be mainly cast green feed, and feed concentrates should be properly fed. Every day, ten thousand grass carps are fed with duckweed or aquatic plants of 70 kg to 90 kg and concentrate feed of 1.5 kg to 2 kg. The first is to feed green fodder, and the second is to cast concentrate in order to prevent grass carp and other fish from competing for food. Quantitative, timing, positioning feeding. For polyculture of cockroaches and squid, fertilization is still required. Fertilizer is applied once every 10 to 15 days, and 70 kg to 90 kg of fermented manure is applied per mu. The transparency of the pool water is maintained at 30 cm to 35 cm. Fifth, water quality. The new water is usually filled once every 10 days, each time adding 20 cm to 30 cm of water and draining some of the old water. Sprinkle lime regularly, usually every half month, 20 kg to 25 kg per mu. Keep water quality fat, live, tender and cool. Winter management of fish ponds 1. Minimize the ice-sealing period. Before freezing, determine the time of irrigation and drainage according to the temperature of the source water and the temperature of the water in the fish pond, keep the temperature of the water in the pool as much as possible, and extend the time for postponing the formation of ice. After the beginning of spring, it is necessary to dilute and dilute ground water, because at this time, the temperature of the source water is higher than the temperature of the iced water in the pool, and ice water should be drained in advance as far as possible, and fresh water is poured to raise the water temperature, prompting the fish to start eating as soon as possible. 2. After the ice is sealed, it is necessary to often play ice in the ice cave and insert appropriate things in the ice cave to breathe and oxygenate. In general, an ice cave with an area of ​​about 0.4 square meters can be played 3 to 4 holes per acre. Put a small amount of fish feed for the fish to feed. Third, after snow, it is necessary to clear the snow on the ice to keep the light time, enhance the photosynthesis of phytoplankton in the pond, and increase the amount of dissolved oxygen in the pool. Fourth, we must pay attention to maintaining the water level in the pool. When the water level drops too fast, the water in the pool is too shallow, the water temperature will drop immediately. Therefore, timely inject new water to ensure proper water levels and water temperatures in the fish pond. At the same time, it can also play a role in improving water quality and enhancing dissolved oxygen. However, when adding new water, be sure to pay attention to the fact that the new water added must not be doubled to cause double ice. This is very dangerous and it is very easy to cause serious oxygen deprivation in the pool under the ice, causing the fish to suffocate and die. 5. Dissolved oxygen in water must be strictly monitored. In places where conditions are met, the amount of dissolved oxygen should be determined every 10 days or so. When the dissolved oxygen in the pool is found to be reduced, oxygenation measures should be taken immediately. For example, inject new water, increase the area and number of ice-breaking holes. You can also use the eyes of the ice hole to see if there are other small animals swimming or attaching plant activities, whether the water color is turbid and dirty, whether the water has odor, etc., to determine the amount of dissolved oxygen in the water and improve the water quality. 6. Adhere to the patrol pool once a day, morning, evening, and night, and observe the water color, water quality, and fish species activities. It is forbidden to skate in the fish pond so as not to alarm the fish school and pay attention to maintaining environmental sanitation and safety. Dirt on the ice surface should be removed at any time. If abnormal phenomena or problems are found in the fish ponds, effective measures should be taken in time to avoid accidents. Winter fish species prevent three diseases, red skin disease. Once the disease is found, sprinkle the bleach over the pond to make the pool water concentration 1 ppm. At the same time, oral administration of sulfathiazole to fish was conducted continuously for 6 days, once a day, and the dosage on the first day was 1 g for every 10 kilograms of fish body weight. On the second to third days, the amount of medication was halved. It is advisable to mix with the appropriate amount of binder when mixing drugs and mix them with baits to make baits. Second, Shui mold. Before the fish is introduced into the pool, apply the fish body with 1% malachite ointment or a suitable amount of sulfa drug ointment. When the disease was discovered, it could use 2.5 kg to 5 kg of calamus leaves, 0.5 kg to 1 kg of salt, 12 kg to 20 kg of urine, and the whole pool should be splashed with water; . Third, small melon worm. The typical symptoms of the disease are visible white small dot-like vesicles on the skin, fins, and hernias of diseased fish. When stocking fish, use 2ppm mercuric nitrate solution to dip for 2 hours to 3 hours, or use 0.1ppm to 0.2ppm mercuric nitrate to spread over the whole pool, which can effectively kill the small melon. 1 meter deep water per mu, with 250 grams of fresh chili powder, 100 grams of dried Ginger, mixed with boiling water, Quanchiposa, can kill small melon insects. Fish species and ponds, and pond time. Generally, from October to November, when the water temperature drops to about 8°C to 10°C, after the fish species stop eating for 3 days to 5 days, the weather is selected to be warm and sunny. The water temperature is too high, the fish activity is strong, the operation is easy to be injured, the water temperature is too low, and the fingerlings are susceptible to freezing and suffering from water mildew. Second, the winter pond selection. The wintering pond area is generally 2 mu to 5 mu, the water depth is preferably 2 meters or more, and the water depth under the ice is not less than 1.5 meters. Locations should be protected from the sun, less silt at the bottom of the pool, strong soil fertility, light leakage, and convenient water sources. Third, fish species. The specification of wintering fingerlings should be between 10 cm and 12 cm, with neat specifications, robust physique, intact scales, and non-destructive fins. And before the pond 5 days to 7 days should stop feeding, select the fine weather to pull the net to exercise 2 times, and then carry out fish distribution, screening, count, and pond overwintering. Generally there are overwintering ponds that have water recharge conditions, with an effective depth of more than one meter, and 0.5 kg per cubic meter. For ponds without water supply conditions, the effective water depth is more than 1 meter and 0.2 kg to 0.3 kg per cubic meter. The fingerlings were soaked in 4% salt water for 10 minutes. Note that if you want to classify a single species, you must use the same species in the same pool. Wintering ponds lack oxygen How to do Fish wintering pools often result in a large number of fish deaths due to lack of oxygen. The method of determining hypoxia and increasing oxygen in fish overwintering pool is as follows: 1. Hypoxia measurement method: (1) The dissolved oxygen in the analysis tank is determined every 10 days in the place where the analysis conditions are determined. When the amount of dissolved oxygen in the tank is reduced to 3 mg per cubic meter, oxygenation measures are taken. (2) In the place where the analysis conditions are not determined, it can be judged by observing the color of water and biological activity. If the water is dark and turbid, there is stench, or there are activities such as zooplankton and fish and shrimp at the edge of the pool and ice eyes, it is a sign of water quality deterioration and lack of oxygen. 2, fill water oxygen. During the winter, when there is a lack of water and oxygen in the fish ponds, water can be diverted directly into the pond. If the oxygen content in the water source is low, the water flow can go through a certain process and drop, increase the oxygen content and then enter the pond, so as to increase the effect of supplemental oxygen. However, it should be noted that excessive iron-containing water cannot be directly injected into fish ponds. It must be oxidized and precipitated after a certain period of time before it can be injected into the pond. The time of water injection and the amount of water injection should be shortened as much as possible according to the specific circumstances. Ice water is generally about 2 meters. 3, chemical oxygen. For small water bodies such as wintering in greenhouses and wintering in refrigerators, in the event of hypoxia, chemicals may be added to oxygen for first aid. Currently used chemical oxygenation agents are: calcium peroxide and hydrogen peroxide, etc., with an amount of 10 mg/L, ie 10 ml to 20 ml per cubic meter, which can be used to increase oxygen 1 mg to 2 mg/l. The role, but not excessive use, so as not to cause damage to the fish. 4, biological oxygen. Plankton releases oxygen during photosynthesis and is the major source of oxygen in wintering waters. Before icing, it is necessary to consciously inject part of the fertilizer and water containing phytoplankton as an introduction, but the amount of water injected should not exceed 1/5. If the wintering pond is lean, 0.5 kg to 1 kg of urea can be applied per acre. Superphosphate increases the water's fatness, but it cannot apply organic fertilizer to avoid polluting the water quality. The fertilization time should not be too early. It is best to be carried out immediately before freezing so as to prevent premature algal blooms and reduce the oxygen content of later water bodies.
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