A Bekko is one solid color with black patches dropped on top and a head left deliberately clean. That plainness is the whole variety, and why it gets mistaken for a Sanke that never grew its red.
This guide covers what a bekko koi fish is, the three types, how to separate one from a Sanke or a Shiro Utsuri, and whether a black mark is pattern or a problem.
Bekko koi at a glance
| What it is | One solid color, white, red or yellow, with black sumi on the body |
| Three types | Shiro Bekko (white), Aka Bekko (red), Ki Bekko (yellow) |
| Defining rule | No sumi on the head |
| Easiest confusion | Sanke, which adds red |
| Adult size | Commonly 24 to 28 inches in a well-run pond |
What is a Bekko koi?
Bekko means tortoiseshell. The sumi sits on an unbroken ground color as defined patches rather than wrapping the fish, and the head carries none of it.
The three Bekko varieties
Named for the base under the black: Shiro Bekko, Aka Bekko, Ki Bekko. White is the form you are most likely to be offered. Doitsu and ginrin describe scales, not a fourth variety.
What colors Bekko come in
White, red or yellow, always under black. A shiro bekko koi should read as clean snow rather than cream, since the white is most of what you are looking at.
How to identify a Bekko koi
Two checks settle it. Look for red: a Bekko has none, and a white fish carrying red and black is a Sanke. Sanke that never developed their hi are commonly sold as Bekko, and that is the mistake to watch for. Then look at the head. Bekko heads are clean, so black running across the face, or wrapping up from beneath, means Shiro Utsuri, where black is the base color rather than the pattern.
Otherwise judge placement: sumi balanced either side of the dorsal line, mostly above the lateral line, with edges you can read. Plenty of people arrive here searching black spot on koi carp about a fish they already own. History separates the two. Bekko sumi has been there since the fish was young and moves slowly if at all, so black spot on koi carp that is new, spreading, raised or fuzzy, or paired with flicking, clamped fins or lost appetite is something else. Get a proper diagnosis from someone who can examine the fish and test your water.
Are Bekko good for beginners?
Yes. Care is ordinary koi husbandry, and the plain ground flags water problems early. Sumi on a young fish is a forecast, though, so buy older if the pattern is why you want it.
How big do Bekko get?
A bekko koi fish commonly reaches 24 to 28 inches in a well-run pond. Volume, temperature and feeding decide growth far more than variety, and most backyard ponds produce less.
How long do Bekko live?
Twenty-five to thirty-five years is the range usually cited for well-kept koi. Husbandry decides it, and a typical backyard pond falls short of the top of that range.
Water conditions for Bekko
Ammonia and nitrite at zero, nitrate low, pH stable around 7.0 to 8.5, oxygen high and moving, and depth enough that winter temperatures change slowly. Stability beats any single number.
How often to feed a Bekko
By water temperature, not the clock. Two to four small feeds daily in warm water, each no more than the fish clear in five minutes. Taper as the pond cools; stop below roughly 50F.
The best diet for a Bekko
A quality staple pellet year-round, wheat germ in cooler water. Use color food sparingly: it deepens red but warms white toward yellow, which on a shiro bekko trades away the thing you bought.
Where to buy Bekko koi from us
Straight answer: we do not stock Bekko right now. Not sold out on a listing, but absent from the catalog entirely as we write this. Watch the Japanese koi selection for what is listed today, and if a shiro bekko koi is the bekko koi fish you want, tell us through our contact form and we will let you know when one lands.
Whatever you end up buying, two conditions. Quarantine every new koi in a separate, filtered, aerated holding system for two to four weeks before it goes anywhere near your main pond, and stock to the adult size your volume and filtration can carry rather than to the size the fish arrive at.
Frequently asked questions
What is a bekko koi?
A koi with one solid base color, white, red or yellow, carrying scattered black sumi on the body and a clean, unmarked head.
How many varieties of bekko koi are there?
Three: Shiro Bekko, Aka Bekko and Ki Bekko, named for the base color. Doitsu and ginrin describe scales, not a fourth variety.
What colours do bekko koi come in?
White, red or yellow grounds, each overlaid with black. The white-based shiro bekko koi is the form most commonly offered.
How can you identify a bekko koi?
No red anywhere, and no black on the head. Red means Sanke; black across the face means Shiro Utsuri. If you searched black spot on koi carp about a fish you own, Bekko sumi is long-standing and stable, while a new or spreading mark needs a proper diagnosis.
Are bekko koi good for beginner keepers?
Yes. Husbandry is standard and the plain ground shows water problems early. Buy older if the pattern matters, since sumi on young koi still moves.
What size do bekko koi grow to?
Commonly 24 to 28 inches in a well-run pond. Smaller ponds produce less, because volume and filtration set growth.
How long do bekko koi typically live?
Twenty-five to thirty-five years is the range usually cited for well-kept koi. Most backyard ponds land below the top of it.
What water conditions do bekko koi prefer?
Zero ammonia and nitrite, low nitrate, stable pH around 7.0 to 8.5, high dissolved oxygen, and depth enough to buffer winter.
How often should you feed bekko koi?
Two to four small feeds daily in warm water, each no more than the fish finish in five minutes. Stop below roughly 50F.
What is the best diet for bekko koi?
A quality staple pellet year-round, wheat germ in cooler water, and color food sparingly, since it warms a white ground toward yellow.