1. How long can koi fish raise 20 cm from fry It takes about half a year for koi fish to raise 20 cm from fry. This kind of fish is a large ornamental fish, and its growth speed is relatively fast, which can grow to 30-40 cm in one year, and some species can even grow to more than 50 cm. It should be noted that the feeding environment will also affect its growth. The better the environment, the faster it grows. If the environment is uncomfortable, it will grow slowly. If you want it to grow quickly, you should ensure the abundance of food and the temperature should not be too low.
2. How to raise small koi fish1. Water quality: Koi fish don't like hard water, so it is necessary to soften the water before raising, otherwise the fry will be difficult to adapt. If tap water is used for farming, it is necessary to dry tap water in the sun in advance, so that the water can release chlorine gas, which is convenient for farming.
2. Water temperature: Koi seedlings of two to three centimeters do not require high water temperature, so it is enough to keep the water temperature at 25 degrees Celsius. If the water temperature exceeds 27 degrees Celsius, oxygen should be started to avoid hypoxia of koi seedlings.
3. Feeding: Koi seedlings of two to three centimeters are in a vigorous growth period, and the demand for nutrients is relatively high. Besides general fish feed, animal feed, such as earthworms and red worms, needs to be fed to promote the growth of Koi seedlings. Under normal circumstances, feeding animal feed twice a week can meet their needs.
