The Yellow River carp is one of the most valuable economic fishes in the country and is a fine variety of freshwater culture. The golden scales are red and tail, and their body shape is long. The meat is tender and delicious. Compared with other catfish, its muscle has a higher protein content and lower fat content, rich in amino acids and a large number of calcium, magnesium, phosphorus and many other elements. It has wide appetite, strong adaptability, rapid growth, and low feed consumption. It can naturally breed in various fresh water areas such as rivers, lakes, reservoirs, and bay ponds.
Preparation before spawning
Spawning tank selection and disinfection
Spawning ponds are divided into two types: earthen ponds and cement pools. The cement pool covers an area of ​​0.1 mu to 0.5 mu, and the earthen pond covers an area of ​​about 1 mu. It has a long strip shape. It must be sheltered from the sun, there is no sludge in the bottom of the pond, and it is convenient for water injection. The cement pool is clear and pulls. The network is easy to operate. The brooding pool should thoroughly clear the pond with lime or bleach before urging production to kill all wild fish and germs.
Fish nest preparation
Cod eggs are sticky. Under natural spawning conditions, eggs stick to the plants and hatch. If there are no attachments, the eggs sink to the bottom of the water and die. Artificial breeding requires preparation of fish nests for fish eggs. The material for the fish nest is often brown. Leather, agglomeration, broken mesh, etc.
Male or female segregation or pull net inspection
Male and female segregation can avoid chasing each other, which is conducive to manual egg collection. It is effective in the development of male and female sex glands, which is conducive to raising the spawning rate and hatching rate. However, in the case of few ponds, the pool can be divided, as long as it is fed well and the production is timely. A large number of fry can also be obtained. Careful attention must be paid to the division and pull-up inspections. Do not injure the fish or the scorpion. The poorly-produced broodstock should be kept in the g-pool and intensively fed on the partial-feeding, to promote its simultaneous maturation.
Hechi
Choice of urine production time
The time of urine production in Hechi is mainly determined by the season, water temperature and fish maturity. When the water temperature reaches 18°C ​​after the spring rain, most of the broodstock matures, and they can produce in the pool. When the nets are pulled together, the females are caught by digging eggs from the genital hole and caught in an egg digger. When the eggs are oblate and grayish yellow, the egg nucleus is concentrated at one end of the animal. The development of the fish eggs until the end of the fourth phase will enter the fifth stage of maturation and can be induced by labor.
Artificial pool production method
The difference in natural spawning of squid due to weather changes and irregular broodstock maturation. Spawning is not much at one time, and it takes a long time to infuse. It causes a lot of inconvenience to production. The artificial production can be arranged according to the planned time and the number of fry to meet the production needs. Male and female broodstock mating group should select female puerperium should be abdominal enlargement, ovarian contour, genital hole near the full, soft and elastic, male fish gently press the abdomen with milky white semen out and can immediately disperse with water. The proportion of females and males is usually divided into two male and three females.
Oxytotics type and dosage
For the large-scale production of seedlings, artificial oxytocin production technology must be used. The oxytocin production method is the same as other squids. Types of oxytocins include luteinizing hormone-releasing hormone drugs and high-efficiency fish oxytocin mixture. The injection method is to put the broodstock in a fish clip and the two persons cooperate with each other. The injection site is a chest or back muscle. The needle is used to provoke the scales and incline to the front of the head by 2 cm. The syringe should be boiled and sterilized before use.
Place the fish nest
After the parentfish pool is injected, it is necessary to arrange the already prepared fish nests to the spawning pool. The common arrangement method is two kinds of ç type and parallel type. The density of the nests can be set so as to open naturally without impeding the spawning of the broodstock to a moderate degree.
Spawning care
On the afternoon of the injection, it is best to add 20 cm to 30 cm of fresh water. Perform a water stimulation, which is conducive to heat. After the liquid injection, it takes 12 hours to 20 hours for the effect time to be able to focus on estrus and spawning. The management staff should observe the spawning dynamics and the egg density of the fish nest at any time. When the fish eggs reach a certain amount, they must update the fish nest at any time.
Fish hatching
Pool hatch
The hatchery is best made of cement. It has an area of ​​50 to 60 square meters and a water depth of 1 to 1.5 meters. This pool is non-polluting, well drained, and easy to emerge. There is no special hatching pool, earthen pond can also be, an area of ​​1 mu ~ 2 acres, water depth of 1 meter to 2 meters. During the incubation period, the temperature of the water should be strictly controlled so that it can always be maintained between 15°C and 24°C. If the temperature is too high or too low, the development of the embryo is unfavorable. In case of sudden drop in temperature, new water should be added to the pool in time to raise the water level.
Drenching water hatching
Drenching water hatching is to put the fish nests with fish eggs in the room at the initial stage, artificially pour water, control certain temperature and humidity, wait until the embryo develops to the eye period, then transfer the fish nests into the pool to hatch the fry, the advantage is management. Concentration, not affected by changes in temperature, not easy to produce water mold, increase hatching rate. The incubator is set in the water incubator and the ovary is suspended on the incubator or layered on the shelf. The height is limited by the ability of the person to raise their hands to spray water. The thickness of the fish nest is to be ventilated and not squeezed. During the incubation period, the indoor temperature must be strictly controlled between 20°C and 25°C. The water temperature should not be lower than 18°C. The watering interval should not exceed 1 hour. After entering the eye-opening period, it should be incubated in time for incubation. .
Artificial Insemination and Detachment Hatching
When the squid's broodstock is injected with oxytocic acid, the fish eggs and sperm are artificially squeezed into the pot to fertilize it when it matures. At the same time, the fertilized eggs are continuously poured into the mud slurry filtered by a 40 mesh sieve, one egg is poured, and one person stirs the mud by hand to make it debonded. 100 grams of talcum powder plus 20 grams of salt can also be used to mix into 10 kilograms of water, and 1 kilogram of fish eggs can be poured into it. After 30 minutes of agitation, all of them can be de-bonded, or water can be added four times to double the weight of fish eggs. , Continuous stirring for 30 minutes, can also achieve the purpose of detackification. After the debonded fish eggs can be concentrated into the broodstock incubation loop or hatching tank for running water hatching, this method can be used in the fish breeding site.
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