Metallic Koi represent performance in business. It is believed that a blue koi brings serenity. The blue, red, and grey Asagi Koi symbolise positivity. It is believed that Black Koi have a patriarchal symbolism, with red belonging to the mother, blue belonging to the son, and pink belonging to the daughter.
Many koi fish, having a lifetime of 200 + years, outlive their owners. There is also a legendary koi that lived to be the oldest Koi in history, called Hanako. In 1751, Hanako was hatched, and he lived to be 226 years old, dying in 1977. That is a very long time of life! Most Koi, however, live for 30-40 years.
The Koi fish is highly intelligent. Koi fish have the ability to identify the person who feeds them, and they can be taught to eat from his or her side, such as a dog or cat. Koi fish are omnivores and are known to consume pond plants, as well as fish, chickens, cabbage, watermelon, and peas of various kinds.
If raised under suitable conditions, koi fish can grow up to three feet long. Koi require shade and deep water due to their delicate skin, so they are vulnerable to sunburn.
It is considered that owners who have got their koi fish as a gift have good luck. While it may be dangerous for a large koi population, koi fish enjoy the company of other koi fish. In Japan, koi fish is sometimes passed down as a family heirloom from generation to generation.
Female Koi develop thousands of eggs during the mating season that will be fertilised in the water by male sperm. About half the eggs that are fertilised will survive. Koi consume their young, newly hatched offspring, called koi fry, in the mating process. During the mating session, koi fish must be taken away from the fry in order to protect the fry.
For a high price, Koi will sell. It can go for thousands of dollars if a breeder raises a highly sought after Koi. $250,000 for a high-quality koi fish is a popular price.