1. Select the broodstock as a breeding carp of the fish to have a purpose to select the broodstock. The Koi mainly watches on the back, so it's best to choose the upper and lower flat, the profile is flat oval, and the overall shape is spinning, and the color is based on the purpose of cultivation to choose the corresponding color of the broodstock. 2. Prepare spawning pools As a spawning pool, small cement ponds are generally used. The shape of the pool is not limited, and the scale is 4 meters high, 4 meters deep, 0.8 meters deep and 0.4 to 0.5 meters deep. Propagation water PH value of 7.2-7.4, the salty, low hardness of the water is good, dissolved oxygen in the water should be guaranteed at 4 mg / l or more. Pay attention to pool sterilizing and pre-manufactured fish nests into the pool in advance. Fish nests are usually made from steamed soaked hollyphus or palm bark and bundled into small bundles. 3. Spawning in the northern regions of China. The breeding season of Koi is from late April to mid-June. When the water temperature rises to 16-18°C, the selected broodstock can be moved into the spawning pool. The broodstock 2 to 3 groups can be, after the broodstock enters the pool, when it is found that the broodstock have mutual rush to chase, it means that the eggs will be laid soon. Spawning usually begins around 4:00 a.m. and ends around 10 am. It can produce 200,000 - 400,000 eggs at a time. Koi eggs usually have a diameter of 2.1 to 2.6 mm. After production, they are swollen by water and the egg membranes are lifted. The stickiness of the eggs will stick to the nests. After the broodstock have produced eggs, the broods with the fertilized eggs are removed, sterilized with 5% - 7% saline for 5 minutes, then the new fish is removed and hatched in the spawning pool. 4. The water depth during hatching and hatching is generally 30 cm. The water quality and water temperature requirements are the same as those for spawning. The length of incubation time is directly related to the water temperature, and shortens with the increase of water temperature within the appropriate water temperature range. It is 4-5 days when the water temperature is around 18°C, and 3-4 days when it is between 20°C and 22°C. At 25°C About 3 days. Newly hatched larvae do not move, do not eat, rely on absorption of abdominal yolk sac and nutrition, until the absorption of yolk is complete, the larvae began to swim freely, and open to food intake outside; at this time should be fed in time feed. 5, the cultivation of fry fry cultivation process is also a process of choosing the best, it is a choice of breeding process. The selection process is usually carried out 3-4 times within 3 months after hatching of the larvae. First pick: 20-30 days after larvae hatch, when fish begin to grow to about 3 cm. It is mainly selected individuals who are physically strong, have a lively swim, and whose characteristics are obvious, and which are eliminated or sold for sale by other individuals. However, due to their different breeds, their growth speed and time for forming markings are not the same. For example, the Showa tricolor Koi carp starts about 15 days after hatching, and the Koi carp starts from about 50 days after hatching. Koi carps of the red and white series and the Taisho three-color series start about 60 days after hatching. Second pick: Start about 20 days after the first pick. The selection criteria is whether the fin shape is good or bad, whether the color is bright or not, whether the pattern markings are clear, and whether the variety features are obvious. The third and fourth picks thereafter are basically the same.
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