Fish winter management practices
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In order to ensure that there is a healthy supply of spring-fleshed fingerlings in the following year, it is crucial to manage the wintering of fingerlings. According to my farm experience, the specific measures for strengthening the overwintering stage are described below. 1 Enhanced feeding and fertilization At the end of autumn, due to the relative lack of sources of green materials, fish ponds dominated by grass carp should increase the amount of concentrate feed. At this time, it is easy to cause pan-chicken to increase the amount of braise in the dog-heroes. In addition to bean cakes, wheat bran, and corn, the daily feeding amount is no less than 4% of the total fish weight, divided into 2 or 3 times in the afternoon. Fish ponds based on squid can also increase the amount of bran fed, as they can also act as a bait. After entering the winter, it is even more than 3 days old. When the water temperature is above 10°C, it should be fed again, once a day or every other day. Before winter, apply organic manure according to the condition of water and fat. Apply 100-150 kg of fermented manure to every 667m2 to increase the water quality, increase the biomass in the water, provide natural feed for the carp, and increase the temperature of the fish pond. . Fertilize 3-4 times throughout the winter. 2 Check into the winter, and pond overwintering between frost and winter, check the net once, and make a general understanding of the body, specifications, survival rate and disease status of the fish. Divide the specifications into several well-conditioned ponds to raise the survival rate. The storage pool is suitable for 1300-2000m2, the water depth is more than 1.5m, the stocking density is 10-13cm, and the species is 50,000-60,000/667m2. About 1m, the fish pond with an area of ​​667m2 or more has the same stocking density of 20,000-30,000/667m2. 3 Filling with fresh water In the autumn and winter season, water is added 15 to 20 days, gradually increasing to ensure that the pool water is fresh and the water quality is tender and not old. If the cold weather comes, increase the water to the deepest level to keep the water warm. 4 Note that disease prevention and treatment of fish diseases should be "preventive and anti-adjusted." Wintering management adheres to the patrol pond. Prior to winter fertilization, 13.5kg/667m2 of quicklime and 1g/m3 of bleaching powder should be disinfected. In the future, the food field is disinfected every 15-20 days. The disease at this stage is mainly to prevent the anchor head rickets and Japanese rickets after the fall, and to prevent hydromycosis in the late winter and early spring. The former can be sprayed or splashed with crystal trichlorfon. , so that the concentration of water up to 1g/m3 every 3-7d again splashed once. The latter is prevented with 4 g/1 salt Quanchiposa or prevented with 0.1 g/m3 malachite green. In addition, the use of 2.5-5kg of salt against human urine 50kg/667m2 is good for the treatment of hydropodium.