Looking at your pond, there are these gorgeous red and white shapes flickering through water. It’s beautiful, but unless you’ve learned about koi, they all appear identical. To tell the difference between an average koi and one that would win a show, you has to understand what to look for. Those of us who haven’t learned how to look miss it. When you do, your pond becomes more than just a feature; it’s a curated gallery.
The Big Three. Or as they are referred to more often, the Gosanke… Are the basis of any conversation regarding Nishikigoi. And rightfully so. They are the foundation of the hobby for good reason.
How to Choose Good Koi Fish
First among these is the Kohaku. It’s a white-bodied Koi adorned with striking red patterns (hi). In principle it’s easy enough. But in practice, not so much. To achieve a truly outstanding Kohaku you need skin that’s as white as porcelain and red markings with sharply defined edges. When the base color takes on a muddy appearance or the red seeps into the white, your fish immediately become less appealing. Contrasting colors is everything.
Adding black sumi to the Kohaku create the Taisho Sanke. This variety has a rule that separates the beginner from the expert. Black should never be seen on head. Some judging circles will disqualify a fish if it has a sumi spot on its forehead because it breaks symmetry.
Instead of white being the base color like in the Kohaku, the Showa Sanshoku use black. This makes for a darker looking fish. The sumi wraps around the head, giving them what appears to be mask-like appearance. They have presence in shows and are respected.
Some also have fun with light and texture. Dramatic two-tones create sharp contrast, typically with a jet-black base overlaid with bold yellows, whites, or even reds (the Utsurimono group). The pattern appear graphic, almost like it was stenciled onto the fish. Then there are metallic ones called Hikari-mono, which dazzle with mirror-bright scales. A Kujaku may feature pineapple-like patterns on its scales, each one shimmering with motion. An Ogon is shiny, perhaps solid gold or platinum. They catch the sun in ways ordinary koi simply can’t.
If you like muted hues, non-metallics are quiet beauties. Backed by their distinctively patterned, blue-grey scales, Asagi is said to be reminiscent of classic Japanese ceramics. With an ancestry that goes back to Germany’s carp, Doitsu types sport big mirrors rather than a full coat, leaving them without scales and streamlined. Leather koi literally have nothing but flesh (meaning their skin will be realy), realy smooth.
While selecting your preferred color pattern is important, it’s only part of the equation. The shape and overall physical health of the fish should of assessed as well. Good genetics mean the fish will have a torpedo shape with good deep shoulders which indicate its potential size in the future. Fins that is intact and spread out cleanly indicate they has no rot or tears. And don’t forget active behavior, a healthy koi swims upright and has alert eyes; a sick koi hangs around on the bottom or lists to one side.
You should also not overlook pedigree. Koi with proven bloodlines (found through reputable breeders) from countries such as Sakai tend to grow bigger and retain their colors and patterns better over time and may even warrant higher price tag.
Koi collecting is a long game. They’re slow-growing, their colors change over time, and they can live for decades. That means setting realistic expectations. The chart above show this by comparing the value and rarity of different types. But more than the numbers, it’s about identifying the ones that speak to you. Do you prefer the bold reds of a Kohaku or the mysterious blacks of a Showa? Either way, you’re investing in living history.
Here’s the thing: the best pond isn’t necessarily the one in which the fish look good on paper (it’s the one where the fish thrive). Invest in quality, treat them with care and enjoy watching your collection evolve year after year.
