Silver carp is an ocean fish. In spring, summer and autumn, they spend most of their time swimming in the upper and middle waters for food, while in winter, they dive into deep water for the winter. Lively, like jumping, have the habit of going upstream, but not very agile and clumsy. Silver carp likes to be rich in water, and individuals of the same kind often gather and swim to the upper and middle waters, especially the Mingshui area with rich water quality.
Afraid of interference. When they are disturbed or touch the network cable, they will jump out of the water and escape from the network. Fast growth and high yield. The sexual maturity of silver carp is 1-2 years earlier than that of grass carp. Mature individuals are also small. Usually, females weighing more than 3 kg can reach maturity. The relative spawning amount of a 5 kg female fish is about 40,000-50,000 /kg body weight, and the absolute spawning amount is 200,000-250,000 from April to May every year. The floatability of eggs. The spawning period is similar to that of grass carp.
Under the condition of pond culture, if the bait is sufficient, it can grow to 500 ~ 800g in that year, the weight of third-instar fish can reach 3 ~ 4kg, and it can reach 30 ~ 40kg in natural rivers. At the same time, the hypoxia tolerance is extremely poor. After lack of oxygen, water will rise immediately, and some will die soon. Therefore, the aerator should be turned on frequently, and Bangbang Jiuyang should be used regularly as a new type of efficient oxygen-increasing surfactant, which can quickly break the water surface. At the same time, it has the functions of improving water quality, removing oil film on water surface, benefiting aeration effect of aerator, oxidizing and degrading harmful substances in water, removing ammonia nitrogen, hydrogen sulfide and nitrite in water, etc. It has a good cleaning effect on the gills of aquatic animals and improves the respiratory efficiency; It also has a good relief effect on hypoxia floating head, dense fog and muggy at night. It is a safe, efficient and green oxygenator, and has no corrosiveness and irritation to cultured animals.
Before stocking, the seedlings must be inspected and quarantined, and those with pure quality, health and no disease and neat specifications should be selected. The stocking time is in the middle and late May. Fish fry stocking: In the middle and late May, the temperature of the pool water is stable above 18℃, which is the right time to put it in. The releasing density of silver carp larvae is 3-5 per square meter. Feeding management: After the fry enter the pond, they mainly feed on zooplankton and debris. Adult fish culture: feeding specification and density of fish, feeding specification of overwintering fish is 100-200g/ fish, and stocking density is 0.4-0.5 fish/m2. Silver carp is a set of fish, which is based on the time when carp are fished out of the pond.
Overwintering density: The overwintering density of adult fish and fingerlings in pressure tanks is generally 0.3-0.6㎏/㎡. According to the condition of the pond. Requirements for overwintering fish: fish should be healthy and fat. Overwintering method: The overwintering pool should be clean with good water retention, and the water depth under the ice should be kept at about1.5m. It should be combined according to different specifications: before freezing, phytoplankton1.5-3.0kg of 90% crystal trichlorfon should be sprayed on each hectare, and the spraying amount should be kept at 25-50mg/L. In order to keep the water surface transparent, the snow on the ice surface should be removed in time. Silver carp is a kind of fish culture, which mainly raises carp, crucian carp, grass carp and bream. The pond selection is completely consistent with the above-mentioned major fish culture that has applied for certification.