There are regular competitions to name the top koi. Judges and buyers pay attention to how healthy its skin looks, its size and body shape, and how gracefully the fish moves in the water. But the most important trait of all is the koi's coloring. The best koi have a good balance of colors and patterns according to their variety. For example, there are koi with light blue spots, ones with large red patches on their backs, or all-metallic gold.
But the most winning fish often just boil down to these three varieties. They're often the most valuable. They dominate the shows, winning nearly every major category each year. And the better-looking the fish, the more a buyer is willing to pay.
Yvo: Yeah, it depends. You can buy some small and cheap koi fish for a couple of bucks, but also, yeah, it can get up really, really high to thousands, ten thousands of dollars.
Narrator: That's Yvo de Wal. He's a koi hobbyist and seller in the Netherlands, and he heads up the YouTube channel Koi Partner. Each year he visits Japan to shop for koi.
Yvo: The breeders are located there, and they have experience with their bloodlines for many, many generations.
Narrator: You see, bloodlines are just as prized in koi as they are in dogs because some of these koi are the result of decades of selective breeding. I mean, just take a look at the koi's wild relative, the common carp. Its dark colors would be considered unattractive for a koi, but it's perfect protection against predators in the wild. So how do you get from this to this? Well, it's actually similar to how we got from this to this, except koi breeders mainly select for size and color and ignore... Fluffiness.
Koi have six types of color cells in their skin. Their cells can be red, yellow, black, white, blue, or metallic. Now in order to get a beautiful, reddish-orange pattern like the one on this 1.8 million dollar fish, you need to select for fish that have a white body and lots of red cells that concentrate in large patches. Red and white are important colors in Japanese culture, representing joy and purity. But having the right colors is only part of it.
A koi's color cells sit at different depths in the skin, some right near the surface and some deeper in, which ultimately determines how bright the fish appears. The brighter the fish, the bigger the price tag. Today there are about 120 varieties. To compare, there are about 200 breeds of dogs. But when it comes down to it, breeding koi is a lot harder. A single koi can give birth to hundreds of thousands of baby fish at a time.
Yvo: I think we are talking about millions and millions of fish per breeder.
Narrator: So breeders must choose wisely. One breeder, for example, reports that he starts with 3 million fish and selects 15,000 to raise over the first year. From that he chooses 1,000 to continue to raise the second year.
Yvo: Yeah, it's a really hard job for the breeders.
Culled from Businessinsider
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