Spring is an important period for gonad maturation. From the beginning of spring to spawning, the nutrients in the broodstock are largely transferred to gonadal development. Therefore, the broodstock should be cultivated in the spring to meet the needs of its gonadal development, so as to promote timely maturation of the broodstock and smooth spawning. The cultivation techniques are:
1. Divide the pond early. Adjusting stocking densities and species collocation is the primary condition for fostering broodstock. The area of ​​the broodstock ponds is 2,000-2,600 square meters. Before the ponds are drained, the pool water is drained to remove wild fish, snails, and predator organisms. At the same time, part of the sludge is removed and 100-150 kg of lime are sprinkled for disinfection. 5 days after the water injection, water depth of 1 meter, oysters, bream broodstock fermented pig manure 200 to 300 kg per gram for the base fertilizer, stocking density of 150 to 200 kg per acre is appropriate. Broodstock should not be used for raising fish and commercial fish. If the pond has been distributed at a suitable density in the autumn of the previous year, the spring can no longer be divided. Such a fish pond can pump 1/3 of the pool water, keep the water depth at 0.8 to 1 meter, and dry the water for about 10 days, which can increase the temperature of the pool water and promote the broodstock to eat earlier.
2, apply fertilizer early. After the broodstock has passed through the winter of 150 days, the accumulated nutrients in the body have been consumed in a large amount, and the constitution is weak. At this time, whether or not the nutrition can be fully supplied will directly affect the gonadal development of the fish. 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 to 8°C, the brood and brood broodstock ponds must pay attention to fertilization and promote the growth of the food organisms. After the water temperature reaches 12 to 15 °C, it is necessary to adhere to the "three look" fertilization, that is, "see the water, see the weather, see the fish's activities," fertilization, adhere to a small amount, multiple fertilization. The transparency of the pool water should be maintained at 25-30 cm. The broodstock and broodstock are dominated by fertilizer and water. At the same time, each broodstock feeds about 20 grams of concentrate feed each day, such as bran, cornmeal, and bean cake powder each accounting for one third. Grass carp broodstock is fed with 1 cm long malt at the beginning of the cultivation. Each end is weighed at 25 grams dry weight per day. At the same time, it is fed with leaves and plants. At the same time, it is mainly fodder, and how much to eat is eaten in 3 to 4 hours. Finished degree.
3, timely water injection. Good water quality is the key to fostering broodstock. More flushing and diligent flushing can adjust the water quality of ponds, improve the water environment, and promote the early maturation of gonads. Starting from the water temperature of 10°C, insist on flushing the water once a day. Every time the water level is increased by 3 to 5 cm, the brooding and brooding fish ponds will be flushed once a week; during the first half of the production period, grass carp should be flushed once a day and flushed each time. Hours, squid and squid ponds are flushed every 2 to 3 days. After the maximum water level is reached, new water must be exchanged.
1. Divide the pond early. Adjusting stocking densities and species collocation is the primary condition for fostering broodstock. The area of ​​the broodstock ponds is 2,000-2,600 square meters. Before the ponds are drained, the pool water is drained to remove wild fish, snails, and predator organisms. At the same time, part of the sludge is removed and 100-150 kg of lime are sprinkled for disinfection. 5 days after the water injection, water depth of 1 meter, oysters, bream broodstock fermented pig manure 200 to 300 kg per gram for the base fertilizer, stocking density of 150 to 200 kg per acre is appropriate. Broodstock should not be used for raising fish and commercial fish. If the pond has been distributed at a suitable density in the autumn of the previous year, the spring can no longer be divided. Such a fish pond can pump 1/3 of the pool water, keep the water depth at 0.8 to 1 meter, and dry the water for about 10 days, which can increase the temperature of the pool water and promote the broodstock to eat earlier.
2, apply fertilizer early. After the broodstock has passed through the winter of 150 days, the accumulated nutrients in the body have been consumed in a large amount, and the constitution is weak. At this time, whether or not the nutrition can be fully supplied will directly affect the gonadal development of the fish. 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 to 8°C, the brood and brood broodstock ponds must pay attention to fertilization and promote the growth of the food organisms. After the water temperature reaches 12 to 15 °C, it is necessary to adhere to the "three look" fertilization, that is, "see the water, see the weather, see the fish's activities," fertilization, adhere to a small amount, multiple fertilization. The transparency of the pool water should be maintained at 25-30 cm. The broodstock and broodstock are dominated by fertilizer and water. At the same time, each broodstock feeds about 20 grams of concentrate feed each day, such as bran, cornmeal, and bean cake powder each accounting for one third. Grass carp broodstock is fed with 1 cm long malt at the beginning of the cultivation. Each end is weighed at 25 grams dry weight per day. At the same time, it is fed with leaves and plants. At the same time, it is mainly fodder, and how much to eat is eaten in 3 to 4 hours. Finished degree.
3, timely water injection. Good water quality is the key to fostering broodstock. More flushing and diligent flushing can adjust the water quality of ponds, improve the water environment, and promote the early maturation of gonads. Starting from the water temperature of 10°C, insist on flushing the water once a day. Every time the water level is increased by 3 to 5 cm, the brooding and brooding fish ponds will be flushed once a week; during the first half of the production period, grass carp should be flushed once a day and flushed each time. Hours, squid and squid ponds are flushed every 2 to 3 days. After the maximum water level is reached, new water must be exchanged.