Carp grows faster. Under normal circumstances, it can reach 50-100 grams in the year, 0.5 kg in the second year, and 1-1.5 kilograms in the third year, starting from 4 years of age, weight and body length. Slowing growth, natural waters, the largest individuals up to more than 7 kilograms. Male sexual maturity takes 2 years, females 3 mature in winter. However, the environmental conditions are good. A winter male can also mature and extrude semen. The fecundity of females varies with individual size, environment, and age, ranging from tens of thousands to 1.5 million tablets. The reproductive season is from May to July. When the water temperature is above 21°C, the water depth at the bottom of the gravel is less than the depth of water. 1 meter of beach spawning, male to female ratio of 1:1. More estrus chase at night, females lay eggs, male ejaculation. When the water temperature is between 21°C and 24°C, the fertilized eggs can be hatched after about 73 hours. The hatched fry is 3.8-4.5 mm in length. At a body length of 5.1 mm, the teeth of the upper and lower jaws have appeared and the fish fry have been able to swim horizontally in the water. The first half of the body is dark purple, the latter half is clear and colorless, and only one purple point is seen in the water. Big head, kiss tip. Artificial breeding 1. Collecting and cultivating brooders is generally carried out in combination with large water surface fishing in the winter. The selected larvae are innocent, and the gonads with better gonad development are used as broodstock. The sexual ratio is 1:1, and the pool or polyculture in grass carp broth pools is used. The squid came to remove the small wild fish in the original pool so that they could get it all and reach sexual maturity. 2. The oxytocin is optimal in the water temperature from 25°C to 30°C from late May to mid-June. The spawning pool conditions are the same as those of the spawning pool of fish. The oxytocic drug can be used as a luteinizing hormone-releasing hormone drug, 30 micrograms per kilogram body weight is injected, the male dose is halved, and the estrus spawning occurs after about 16 hours to 22 hours. Artificial insemination can also be performed. 3. Incubation and use of home fish hatching ring, hatching cylinder and other tools can be, but the water quality should be fresh, adequate oxygen, prevent the entry of large zooplankton and pay attention to the invasion of trilobites and other predators. When the water temperature is constant at 25°C-26°C, the fertilized eggs can hatch as long as 30 hours. Nursery Seeds can be grown in a small pool with microfluidic water. Carp is a carnivorous species that uses live fish and shrimp as its main food for life. When it is being used as an artificial oyster production, the carp must be bred in advance or in synchrony with a young fish such as a head of a scorpion head or a squamae, or scorpion fish, for opening. Prey, otherwise hunger and death. Within a month of fertility to 2.6-3 cm (commonly known as summer fish species), generally require 200-300 bait fry. Adult fish breeding technology 1. The area of ​​the single-culture pool is 0.5-1 mu, and the water quality is fresh and micro flow. For small feeds, such as small-headed wild fish such as ear fish or overstocked tilapia seedlings and small shrimps, 1,000 catfish species are stocked per mu, and about 100-150 kilograms of commercial carp can be produced. The feed coefficient is 2. 2. Mixed-breeding and polyculture is a source of bait in fish ponds that contain more wild fish. Each 20-40 blooms per acre will not harm large-size home fish. However, the water quality should not be too fat. In the prevention and treatment of fish diseases in fish, the carp must be used with caution because it is extremely sensitive to copper sulfate and other drugs. 3. In the broodstock breeding pool where the nesting is raised in the home fish, the wild fish in the pool can be eliminated to ensure the growth and development of the broodstock, and high-quality commercial squid can be obtained. 5-8 kg, can be listed that year.
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