First, the skills of raising koi fish
1, keep the water temperature.
The temperature of fish culture should be controlled at 2-30 degrees Celsius. If you buy koi fish newly, pay attention to the water to adapt to the temperature. Remember to add heating rods if the temperature is too low in winter. Water should also be changed frequently to maintain clean water quality, and when changing, remember to wipe the fish tank and clean it thoroughly.
2. Correctly distinguish whether fish are hungry or full.
According to the color of fish manure, the saturated digestion and absorption of fish hunger can be distinguished. If the fish manure is green, brown or black, it means that the fish is suitable for feeding and well absorbed. If the fish manure is white, it means that the fish are full.
Second, the method of raising koi fish
1, treatment water quality
Tap water is the most commonly used water body in the process of breeding koi fish. River water, well water and spring water are rarely used. No matter what kind of water quality, they all contain a certain amount of chlorine. Therefore, chlorine removal treatment should be carried out before use. Appropriate amount of sodium thiosulfide can be put into the water to react with chlorine to generate harmless sodium salt.
2. Pond construction
Before breeding koi fish, we should choose to build a pond in a place with humus soil, leeward facing the sun, abundant water sources and convenient irrigation and drainage. The depth of the pond is1.5-2m, and the water depth is1.2-1.5m. The fish pond is mainly surrounded by cement, and the bottom layer inclines to one end of the drain. When it is full of water, add straw to soak it./.
3. fry cultivation
Koi fish with strong physique, glittering and translucent color, steady swimming posture and no disease or injury is selected as the seed. When the water temperature is stable above 16℃, the fish eggs are transferred to the incubation tank. After 3-4 days of incubation, the fry begin to float to the surface for food. At this time, the fry should be immediately fished into the nursery tank.
Breeding management in koi fish
Koi fish is an oviparous fish, which naturally breeds and lays eggs in March-April every year. In order to artificially breed koi fish, it is necessary to squeeze the eggs in the abdomen of female koi fish into a plate, then squeeze the semen from male koi fish onto the eggs, and then stir them evenly with a stick to improve the fertilization rate of eggs.
When artificially breeding koi fish, fertilized eggs need to be poured into prepared fish nests, which can be made of willow bark, so as to improve the hatching rate of koi fish. After waiting for 2-3 days, the transparency of fish eggs will become low, and a black spot will appear in the center, which is the body of young fish.
When raising young fish in koi fish, it is necessary to place the fish tank in a ventilated and cool place to avoid the wind and rain, so as to avoid the foul water from affecting the growth of koi fish. In addition, during the incubation period of young fish, you can't take out aquatic plants or fish nests to avoid affecting the growth of koi fish, and you should feed young fish in koi fish with food such as Daphnia, yellow croaker and egg yolk.