1. Properly stocked. Generally, 100 to 150 kg of broodstock are stocked per 667 square meters. The stock of grass carp may be larger, while the stock of flowers and white catfish is less.
2. Increase the water temperature. The clear and timely drainage reduces the water level of the fish pond and accelerates the water temperature of the fish pond. Displacement can reduce the water level of the fish pond by about 30 centimeters. When rainy days or cold air comes, it is necessary to fill the water in advance to slow down the heat dissipation of the pool water.
3. Reasonable fertilization. The cultivation of broodstock was mainly based on organic manure, and 70% of human feces and 30% of livestock manure were applied to carp ponds, and 70% of livestock manure and 30% of manure were applied to carp ponds. Each time about 667 square meters fertilize about 200 kg, it is applied every 7 days. Less or no fertilization should be applied 15 days before induction. The transparency of the pool water is maintained at 35-45 cm.
4. Scientific feeding. Spring is the stage of gonadal development of fish, and the food intake increases. Early feeding of grass carp should be concentrated feed such as bean cake, bran, malt, and grain buds, supplemented with leafy vegetables and lettuce leaves, each feeding 50 to 100 grams per tail, and be fed regularly at regular intervals. In the later period, mainly green fodder such as aquatic grass and grass should be used, supplemented by concentrated feed, and the amount of daily feed should be 2% to 4% of the fish's body weight. It is advisable to feed 2 hours after feeding. The broodstock pond is mainly fed with live animal feed containing high levels of snails, razor clams, quail meats, etc. The daily dosage can account for 3% to 5% of the fish’s body weight, supplemented by bean cakes, supplemented with pellet feed, etc. , Daily feeding rate of 40 to 60 kg per 667 square meters, to eat enough. The brooding fish ponds are mainly used for fertilization. Each time about 50 kg of manure is applied, and they are applied every 2 to 3 days. Feeding is generally stopped 15 to 20 days before induction. When the water temperature rises above 20 °C, it is also necessary to pay attention to gradually reduce until the stop cast fine material, prevent the pro-fish body to accumulate too much fat, delay gonad maturation and cause dystocia.
5. Adjust water quality. The water quality should remain fat, live, tender and cool. The transparency of the blue and grass brood pool water remained above 35 cm. Pay attention to the frequent addition of new water, 2 to 3 times a day, each adding 20 to 30 centimeters of water. From the beginning of April, the antenatal water stimulation stage begins once every day for 2 to 3 hours. When flushing, the water flow rate should be moderate, too much rush to consume the pro-fish physical strength, too slow will affect the flush effect.
6. Prevent fish diseases. Adhere to the morning and evening patrol ponds, find the fish floating head, should immediately add new water or start aerator. The broodstock diseases mainly include erythroderma, print disease, and anchor head rickets. Control methods: use 2 ~ 4 mg / kg gall and 1 mg / kg bleach Quanchiposa can prevent redness and print disease; Quanchiposa bleaching powder, 1 g per cubic meter of water body, while cast every 100 kg of fish every day Feed 1 to 2 grams of furazolidone and feed 3 to 6 days to treat erythroderma; use bleach or 1% benzoic acid to treat the affected area; 90% of crystals of trichlorfon can be used for anchor head lice, and medication is required for every cubic meter of water. 0.5 grams, spilled once every 15 days, even splashed 2 to 3 times.
Author: Huangma Primary School, Jinzhu Town, Guangxi
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