Skillful management of adult fish in autumn

It is suitable to adjust the water temperature in autumn, which is the peak season for fish growth. The metabolism of pond fish is strong and there is a lot of excreta. Attention should be paid to strengthening water quality management and improving the ecological environment. First of all, it is necessary to maintain a deeper pool water in order to expand the fish carrying capacity of the water body, reduce the impact of the drop in water temperature after autumn, and prolong the feeding time. Second, it is necessary to inject new water frequently. Generally add water three or four times a month, each time the amount of water is 15 cm ~ 25 cm deep. Third, sprinkle quicklime in time. Once every half month, 15kg ~ 20kg quicklime is used for every 667 square meters of water, and the whole pool is sprinkled with chemical water, which not only disinfects and sterilizes, but also increases calcium.

In the ponds where topdressing fertilizers mainly raise filter-feeding fish, when the temperature is high in early autumn, the amount of fertilizer should be less and more times, chemical fertilizers should be applied mainly to avoid the deterioration of water quality and maintain good water quality. Organic fertilizer should be applied mainly when the water temperature drops at the end of autumn. accelerate the pond water to become fertilizer and thicken, promote the mass reproduction of biological bait, and provide sufficient nutritional reserves for fish overwintering. Fertilization in autumn should be reasonably controlled according to the air temperature, the fat and thin water quality and the growth of fish. Generally, topdressing should be done every 15 to 20 days, and 3 kg of urea, 6 kg of calcium superphosphate or 150 kg ~ 200 kg of rotten livestock and poultry manure should be applied to every 667 square meters of water. Keep the pool water oil-green or tea-green with a transparency of about 30 cm.

To strengthen the feeding, the temperature begins to drop in autumn, and the temperature difference between day and night is large. in order to fatten the fish, it is necessary to ensure a comprehensive, adequate and palatable feed supply. Ponds that mainly raise herbivores or bottom feeding fish should first be fed with fresh, green and pollution-free green fodder, and then fed with formula feed or other concentrate once a day in the morning and afternoon. The amount of green feed should be finished within 2 hours, and the amount of compound feed should be 3%-6% of the body weight of eating fish. The temperature gradually decreased after October, and the formula feed with high crude protein content should be used as the main feed, usually once a day, with a feeding amount of 1% to 3% of the fish's body weight.

To prevent the fish floating head from entering the autumn, for the ponds with high culture density, due to the large amount of fertilizer applied by bait and the high content of organic matter, it is easy to cause fish floating head due to hypoxia, so it is necessary to strengthen the pond patrol in the morning and evening, especially at night. Once the fish is found to eat less suddenly, the eating time is prolonged, especially the grass carp swims all over the pond without any sign of feeding, indicating that the water has begun to lack oxygen. For example, spray can be seen on the water surface during the day, and obvious waves can be seen on the water surface after the fish are frightened, indicating that dark floating heads have appeared. When it is found that the fish has a floating head, the water should be changed in time and the aerator should be turned on to increase oxygen.

After timely fishing in autumn, some fish have reached the commodity specifications. If they continue to feed, eat a large amount of food and grow slowly, they should be caught and listed in time to reduce the density of fish in the pond so as to accelerate the growth of fish that do not meet the commodity specifications.

The prevention and control of fish disease in autumn is the season of frequent occurrence of fish disease, which is very easy to occur Gill rot disease and enteritis, so it is necessary to strengthen the prevention and treatment of fish disease. Can be hung in the food basket, each basket containing 100 grams of bleach, 150 grams of crystal trichlorfon, hanging for 5 to 7 days. At the same time, every 100 kg of eating fish was fed with 1 gram of oxytetracycline or 2 grams of allicin or 500 grams of chopped leek once a day for 3 ~ 6 days. In addition, it is strictly forbidden to feed moldy deteriorated feed, pay attention to timely removal of residual bait, dirt, etc., to keep the pool water clean and hygienic.