Every year after the beginning of spring, as temperatures continue to rise, the relatives in the wintering pool have begun to recover. Due to improper feeding and management and other reasons, the intimacy after the winter revived often causes "chun-chun disease" and a large number of deaths. Now the main reasons and prevention measures are introduced as follows. 1. Poor constitution: After wintering, due to excessive consumption of nutrients, the nutritional status in the early spring is generally poor. Feeding must be strengthened to improve disease resistance and reduce death. After awakening from hibernation, more animal feed such as animal viscera and fresh snail meat should be fed. The feed amount should not be less than 15% of the carcass fish per day, and nutrient consumption should be supplemented as soon as possible. One of the key measures. 2. Disease: The body is very poor in spring, and it is vulnerable to red floor disease and red neck disease. The floor of the hernia floor with red floor disease is red and swollen, the neck is thick, the lazy movement is resisted, and the liver is dissected yellowish yellow. No food has bloody water in the abdominal cavity. Suffering from a red-necked neck, the neck can't be retracted, the abdomen shows a red spot, the throat is swollen, the nose and mouth are bleeding, and the eyes are white and cloudy. If you do not take preventive measures in time after winter, you often cause a lot of death. For the newly-purchased Qiangtang Xiatang, besides spilling and disinfecting with 20-30 g of quicklime per cubic meter, the intrinsic pot should also use 100 g/m3 of potassium permanganate solution or 25 g/kg salt solution to dip. 10-15 minutes, the liquid was disinfected and then put into the pool. For those who have already developed the disease, you can choose to indulge in Thai II or oxytetracycline or chloramphenicol or sulfa drugs, appropriate amount of vitamin E, and mix and feed in bait. 6 days is a course of treatment and every 100 kilograms of relatives On the first day, 200 grams of medication is used and halved on the 2nd to 6th day. Usually, one course of treatment can control the disease. For non-pathogenic pools, half-dose medications can be used for prevention. 3. Improper polyculture: Many conservation farmers have used the space and baits of water to make full use of other fish in the rearing ponds, including muddy habits such as earthworms and squid. These fishes usually compete with the fish. During the hibernating period, the mud-drilling activities in the eel did not allow the pupae to hibernate and hibernate, causing the pupae to consume too much of their strength and nutrition and cause death. Therefore, only a small amount of fertilized fish such as cockroaches and cockroaches can be stocked in Dianchi Lake, and fish such as cockroaches and cockroaches that have mud-drilling habits should not be stocked. 4. Deterioration of water quality: After the relatives have recovered from the winter, due to the feeding of bait and other reasons, the water quality gradually deteriorates, and a large number of pathogens cause epidemics. Therefore, when the water temperature reaches 15-18Â°C or when the water quality deteriorates significantly, it is necessary to perform a large water change, and pay attention to the regular replacement of fresh water every week. When the temperature rises above 25Â°C, a quick lime disinfectant should be poured every month in Dianchi Lake. The appropriate concentration is 20-30 g/m3.
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