Spring is an important stage in gonad maturation. From the beginning of spring to spawning, the nutrients in the broodstock will be transferred to gonadal development in large quantities, making it well developed from stage III to stage IV until maturity. Therefore, the intensive cultivation of broodstock is very important in the spring. Only by strengthening the cultivation of broodstock can we meet the needs of gonad development, and promote the timely maturation of broodstock and smooth spawning. The cultivation techniques are:
I. Early adjustment of stocking densities, species, and reasonable collocation is the primary condition for the cultivation of broodstock. After the melting of snow and ice in the early spring, the brood fish pond was selected at noon on sunny days, and the area of ​​the pro-fish pond was 2,000 square meters to 2,600 square meters. Before the ponds are drained, pool water is drained to remove wild fish, snails, and predator organisms. At the same time, some sludge is removed. Lime 100 kg/mu - 150 kg/mu is used for disinfection. Water is injected 5 days later and the water depth is 1 meter. , 鳙 bred fish fermentation manure 200 kg / acre to 300 kg / acre, as a base fertilizer. The broodstock stocking density is generally 150 kg/mu to 200 kg/mu. In general, the main broodstock accounts for 80% to 90%, and broodstock ponds should not be used for raising fish species and commercial fish.
If the previous year's fall has been passed through ponds at an appropriate density, springs will not be divided again. Such a fish pond can pump 1/3 or 1/2 of the pool water, keep the water depth at 0.8 meters to 1 meter, and dry the water for about 10 days, which can increase the pool water temperature and prompt the broodstock to eat early.
Second, early application of broodstock broodstock through up to 150 days of winter, the body has accumulated a lot of nutrients, so the body is weak, such as nutrition is fully supplied, will promote the development of gonads. Early application of bait fertilizer can meet the nutritional needs of broodstock, promote the development of gonad gonads, increase fertility, and timely enter the perinatal period. When the water temperature reaches 6°C～8°C, the broodstock and bream broodstock should pay attention to fertilization and promote the growth and reproduction of food organisms. We must also apply fertilizer according to the water color when the water temperature reaches 12°C to 15°C. We must adhere to the "three look" fertilization method. That is to say, look at the water color, see the weather, watch the activities of the fish, and adhere to the principles of small amount and multiple fertilization. The transparency of the pool water should be kept between 25 cm and 30 cm. The broodstock and bream broodstock are mainly fed with fertilizer. At the same time, each broodstock feeds about 20 grams of concentrated Feed per day, such as bran, cornmeal, and bean cake powder each accounting for 1/3. Grass carp broodstock is fed with malt (about 1 cm in length) in the early stage of cultivation. Each end is cast with a large, dry weight of about 25 grams per day. At the same time, it is fed with leaves and plants, and it is mainly Fodder in the later period. 3 hours to 4 hours after eating. Squid should be fed pelleted food and fed twice a day. Before the broodstock comes into production, the feed should be stopped and the feeding should be stopped 2 days before the birth, especially the grass carp.
Third, timely injection of water to ensure good water quality is another key to the cultivation of broodstock, more flushing, diligent water can adjust the pond water quality, improve the pool water environment, and promote the early maturation of gonad gonads in order to successfully spawn and increase the productivity. Starting from the water temperature of 10°C, insist on flushing water once a day, increasing the water level by 3 cm to 5 cm at a time, licking and licking the broodstock pool for 1 week; once in the first half of the priming period, grass ponds should be flushed every day. Flush for 2 hours; squid and squid pond flush every 2 to 3 days; after reaching the highest water level, fresh water should be exchanged; when the water temperature of squid reaches 15°C, a small amount or stop flushing to prevent sporadic spawning of squid .
4. The physical condition of early-stage disease-prevented broodstocks is related to the success or failure of artificial breeding work and the yield of seedlings. Therefore, the prevention work of broodstock is very important. Before the water temperature is 10°C, before the broodstock eats normally, it is necessary to disinfect the pond's body of water and fish, eliminate pathogens and parasites early, and ensure that the broodstock can develop normally. The method is to spit out different drugs in 2 consecutive 5 days. On the first day, 1 mg/L bleaching powder was splashed on the whole pool; On the 5th day, 0.7 mg/L copper sulfate was poured on the whole pool; on the 10th day, fresh water was added and fed to the feed to enter the normal incubation period. In addition, three baits should be fed during the broodstock incubation period in spring to prevent broodstock diseases.
Fifth, frequent patrol pond patrol pond is an indispensable important work in the broodstock cultivation. Every day, there must be a dedicated person to inspect the pool activities and eating conditions, timely remove residual baits and residues, and find problems in a timely manner. In April, pond water gradually became fat and organic matter in pond water increased. The gonadal development of broodstock had entered a period of large growth and was close to maturity. At this time, broodstock required increased oxygen. Once the water was injected with oxygen, it was easy for the broodstock to float and even cause death. Therefore, adhering to the patrol spot at 2 to 5 in the morning is the key to guaranteeing the safe survival of broodstock. When the floating head is found, the aerator or fresh water should be started in time. At the same time, we should also develop good habits of morning, evening, and evening patrols to ensure a good environment for normal growth and development of broodstock.
I. Early adjustment of stocking densities, species, and reasonable collocation is the primary condition for the cultivation of broodstock. After the melting of snow and ice in the early spring, the brood fish pond was selected at noon on sunny days, and the area of ​​the pro-fish pond was 2,000 square meters to 2,600 square meters. Before the ponds are drained, pool water is drained to remove wild fish, snails, and predator organisms. At the same time, some sludge is removed. Lime 100 kg/mu - 150 kg/mu is used for disinfection. Water is injected 5 days later and the water depth is 1 meter. , 鳙 bred fish fermentation manure 200 kg / acre to 300 kg / acre, as a base fertilizer. The broodstock stocking density is generally 150 kg/mu to 200 kg/mu. In general, the main broodstock accounts for 80% to 90%, and broodstock ponds should not be used for raising fish species and commercial fish.
If the previous year's fall has been passed through ponds at an appropriate density, springs will not be divided again. Such a fish pond can pump 1/3 or 1/2 of the pool water, keep the water depth at 0.8 meters to 1 meter, and dry the water for about 10 days, which can increase the pool water temperature and prompt the broodstock to eat early.
Second, early application of broodstock broodstock through up to 150 days of winter, the body has accumulated a lot of nutrients, so the body is weak, such as nutrition is fully supplied, will promote the development of gonads. Early application of bait fertilizer can meet the nutritional needs of broodstock, promote the development of gonad gonads, increase fertility, and timely enter the perinatal period. When the water temperature reaches 6°C～8°C, the broodstock and bream broodstock should pay attention to fertilization and promote the growth and reproduction of food organisms. We must also apply fertilizer according to the water color when the water temperature reaches 12°C to 15°C. We must adhere to the "three look" fertilization method. That is to say, look at the water color, see the weather, watch the activities of the fish, and adhere to the principles of small amount and multiple fertilization. The transparency of the pool water should be kept between 25 cm and 30 cm. The broodstock and bream broodstock are mainly fed with fertilizer. At the same time, each broodstock feeds about 20 grams of concentrated Feed per day, such as bran, cornmeal, and bean cake powder each accounting for 1/3. Grass carp broodstock is fed with malt (about 1 cm in length) in the early stage of cultivation. Each end is cast with a large, dry weight of about 25 grams per day. At the same time, it is fed with leaves and plants, and it is mainly Fodder in the later period. 3 hours to 4 hours after eating. Squid should be fed pelleted food and fed twice a day. Before the broodstock comes into production, the feed should be stopped and the feeding should be stopped 2 days before the birth, especially the grass carp.
Third, timely injection of water to ensure good water quality is another key to the cultivation of broodstock, more flushing, diligent water can adjust the pond water quality, improve the pool water environment, and promote the early maturation of gonad gonads in order to successfully spawn and increase the productivity. Starting from the water temperature of 10°C, insist on flushing water once a day, increasing the water level by 3 cm to 5 cm at a time, licking and licking the broodstock pool for 1 week; once in the first half of the priming period, grass ponds should be flushed every day. Flush for 2 hours; squid and squid pond flush every 2 to 3 days; after reaching the highest water level, fresh water should be exchanged; when the water temperature of squid reaches 15°C, a small amount or stop flushing to prevent sporadic spawning of squid .
4. The physical condition of early-stage disease-prevented broodstocks is related to the success or failure of artificial breeding work and the yield of seedlings. Therefore, the prevention work of broodstock is very important. Before the water temperature is 10°C, before the broodstock eats normally, it is necessary to disinfect the pond's body of water and fish, eliminate pathogens and parasites early, and ensure that the broodstock can develop normally. The method is to spit out different drugs in 2 consecutive 5 days. On the first day, 1 mg/L bleaching powder was splashed on the whole pool; On the 5th day, 0.7 mg/L copper sulfate was poured on the whole pool; on the 10th day, fresh water was added and fed to the feed to enter the normal incubation period. In addition, three baits should be fed during the broodstock incubation period in spring to prevent broodstock diseases.
Fifth, frequent patrol pond patrol pond is an indispensable important work in the broodstock cultivation. Every day, there must be a dedicated person to inspect the pool activities and eating conditions, timely remove residual baits and residues, and find problems in a timely manner. In April, pond water gradually became fat and organic matter in pond water increased. The gonadal development of broodstock had entered a period of large growth and was close to maturity. At this time, broodstock required increased oxygen. Once the water was injected with oxygen, it was easy for the broodstock to float and even cause death. Therefore, adhering to the patrol spot at 2 to 5 in the morning is the key to guaranteeing the safe survival of broodstock. When the floating head is found, the aerator or fresh water should be started in time. At the same time, we should also develop good habits of morning, evening, and evening patrols to ensure a good environment for normal growth and development of broodstock.
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