Koi fish (锦鲤) are large fish. They are very popular in the world, but Japanese and Chinese people especially (尤其) love them. Walk through any garden or public park in Japan or China, and you will always find a pond with these colorful fish. The fish are big. Some can grow as long as 90 cm!
Koi fish can be white, black, blue, red, cream and yellow in color. They have different spots (斑点) on their bodies. They look very beautiful.
Koi fish usually live for 25 to 30 years. But some can live for more than 100 years!
Koi fish eat watermelons and peas. They also eat other kinds of fish and their eggs.
Koi fish are very clever. Keepers can train the koi fish to eat from people's hands.
The best water temperature for koi fish is anywhere between 15 and 25℃. In the cold winter, they swim to the bottom of their ponds and go into dormancy (冬眠) .
Do koi fish love the sun? No! If their ponds don't have enough shadow, they can get sunburned (晒伤的) on hot sunny days and may die.
