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2, proper stocking. Calculated in broiler body weight, generally 100-150 kg per mu. The stock of grass carp may be slightly larger, and the stock of flowers and white mullet should be less.
3, moderate fertilization. Spring is the stage of gonadal development of fish, and the food intake increases. The broodstock and broodstock ponds were mainly used to strengthen fertilization. The cultivation of broodstock was mainly based on organic fertilizer, the squid ponds accounted for about 70% of manure, and the livestock manure accounted for about 30%; the squid ponds were dominated by cow dung, generally accounting for 70%. Human feces account for 30%. At the same time as the fish pond is being fertilized, it is best to apply powdered compound feed or bean cake slurry. Fertilize once a week about every week, about 200 kg per mu. The amount should be appropriate, according to the flexibility of pool water, generally to keep the transparency of the pool at 35-45 cm is better, the carp pool water is yellow-green, oil blue is appropriate, the carp pool water to tea brown is better. Give less or no fertilization in the first half of the month before giving birth.
4, increase the water temperature. The sunny and timely drainage reduces the water level in the fishing pond and accelerates the temperature of the fishing pond. Displacement can be reduced by about 30 cm in the water level of the fishing pond. When rainy days or cold air comes, it is necessary to fill the pool water in advance to slow the cooling of the pool water.
5, reasonable feeding. When the water temperature was at 10°C, the broodstock began feeding and the food intake gradually increased as the water temperature increased. Feeding should be changed from concentrate to green, and feed volume should be increased or decreased according to water temperature and broodstock feeding conditions.
Grass carp is generally fed with malt, grain buds and bean cakes in the early spring, supplemented with leafy vegetables and lettuce leaves, feeding 50-100 grams per end per day. Feed should be deposited on a fixed food table. In the later period, the green feed such as ryegrass, aquatic plants and lettuce leaves should be used as the main ingredient, supplemented with concentrated material, the ratio of green material and concentrate material should be approximately 20:1, and the daily feeding amount should be 3%-5% of the fish's body weight, and be eaten for 2 hours. Finished degree. In particular, the feeding of malt and lettuce leaf promotes the development of gonads of broodstock.
The herring broodstock is mainly devoted to fresh feed containing high levels of animal protein such as snails, scorpions, and quail meat. The daily dosage can account for 3% to 5% of the fish's body weight, supplemented by a small amount of bean cake, combined with pellet feed. Concentrates, such as 40-60 kilograms per mu per day, to eat full. Feeding is generally stopped 15-20 days before induction. When the water temperature rises above 20 °C, it is necessary to pay attention to gradually reduce until the stop cast concentrated material, prevent the pro-fish body to accumulate too much fat, delay gonad maturation and cause dystocia.
6, water quality regulation. The water quality remains fat, live, tender and cool. Before spring feeding, fertilization, fertilization, the old water in the pool should be replaced by half, and new water should be added to maintain the water depth at about 1 meter, which is conducive to increasing the temperature of the pool water and converting the material energy of the pond to promote the growth and development of the broodstock. Spring flushing is also an important measure to promote gonad development in broodstock.
The pupa and brooding fish ponds are generally flushed twice a month. The grass carp brooding ponds are flushed twice a month, each time adding 5-10 cm of water. The puffin fish and brooders are flushed once every 1-2 days before the childbirth. Or make the water into a microfluidic state, and the broodstock of grass carp should flush water once a day for 2-3 hours in the first half of the production period. The entire cultivation process of the grass carp broodstock should keep the water fresh, and its transparency should be kept at 35. More than cm.
The speed of water flow during flushing should be moderate, too much urgency to consume the power of the broodstock, too slow to affect the effect of flushing. If the water supply is insufficient, the original pond water can be pumped back or the adjacent pond water can flush with each other. From the end of April, the pre-stream water stimulation stage begins, once a day for 3 hours.
7, tour pond and disease prevention. Check the pond once a day at dawn and in the evening to check if there is any increase or decrease in the amount of fish eaten and the water is thin and thin to determine the amount of feed and the amount of fertilizer applied. A pan-pool warning was found and the head was severely floating. New water or an aerator must be added immediately.
The diseases of broodstock mainly include print disease, red dermatosis, and anchor head rickets. Prevention methods include: (1) Using 1ppm bleaching agent or 2-4ppm Gallic Quanchiposa to prevent printing and red pigment. (2) In the treatment of erythroderma, injectable chlortetracycline was injected at a dose of 5 ml/kg body weight of the diseased fish, and the affected area was smeared with 1% stearyl carbonate. (3) The treatment of print diseases can be used to scrub the affected area with 1% benzoic acid. (4) Anchor head lice are sprayed and killed with 0.2-0.5ppm 90% crystal trichlorfon. (5) Every two weeks, after the broodstock eats, the food is disinfected with bleach or copper sulphate once, and the amount is about 250 grams.
Intensive breeding of broodstock in the spring
1, choose a good fish pond. Should choose a quiet environment, convenient transportation, close to the water source and urine production pool, the bottom of the pool requires a flat, non-leakage, an area of ​​1.5-2 acres, about 2 meters deep pond is a broodstock cultivation pond.