First, regulate water quality, add oxygen to water. One is to add new water to increase the amount of dissolved oxygen in the water. Normally, fresh water is added 7 times to 20 times a month. Each time the water is added is 1 hour to 2 hours, and the amount of water added is 5% to 10% of the whole pool. The second is to sprinkling lime, which can increase calcium quality, but also disinfection and sterilization, generally 10 days to 15 days, once per acre water depth of 1 meter pond, with quick lime 15 kg to 20 kg melt into a slurry sub-region for two sputters.
Second, fertilize water quality and improve the environment. Autumn climate is a crucial period for the growth and development of grass carp. At this time, more fertilizer should be used to cultivate water quality. Generally, 300kg to 400kg of cow manure per mus of water surface, 2.5kg to 3kg of room urea, 4kg to 4.5kg of superphosphate, to ensure that fish have enough biological feed to facilitate the accumulation of nutrients, and to maintain Good growing environment.
Third, feed the fine material, long body increase. The temperature in autumn has decreased significantly, and zooplankton and organisms in the water have decreased. In order to meet the needs of grass carp feeding, artificially make up for the lack of concentrate (with rice, rice bran, wheat bran, soybean flour, peanut bran, etc.) and feed once a day. Daily concentrates account for 3% to 4% of total feed. The new beginning of October should be appropriately increased to reach 5% to 9%0.
Fourth, feeding green material, thickness and match. Before feeding the concentrate, it should be fed with green material, ie grass, vegetables, etc., and strive to be fresh, green, and non-polluting. Do regular, quantitative, fixed-point. Feed 3 snacks each time to eat latitude. In order to increase appetite, a variety of green materials can be fed in turn to promote fast growth.
5. Always observe and prevent floating heads. In the fall, for fish ponds with high intensive density, the amount of organic matter in the water is too large, the amount of organic matter in the water is high, the oxygen consumption factor is increased, and fish activity is frequent. In order to avoid the occurrence of anoxic floating heads, it is necessary to frequently visit the ponds every morning, afternoon, and especially in the evening.
Six, prevention and treatment of fish diseases, long and fattening. Large-scale grass carp in the fall, gluttony, prone to enteropathies, gill disease, etc., can be used in the food market with bleaching powder, 50 grams to 100 grams of bleach per armor, 95% crystal trichlorfon 100 grams to 150 grams , Hang 2 篓 ～ 3 æ¯ per acre of water surface, even hung 5 days ～ 7 days, at the same time, remove the slag quality in time, only use the metamorphic food to feed the fish. In addition, we must also pay attention to the elimination of snakes, algae and other predators in the pond to avoid damage and affect the development of grass carp.
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