OUR BREEDING PROGRAM
Japanese bloodlines. Honest culling. American patience.
Every koi we breed at Waterwheel comes from our Japanese import
broodstock. There are no exceptions, no shortcuts, and no
domestic genetics in our breeding ponds. This is the line we
drew in 2025 when we rebuilt the farm, and it's the line we hold
every season.
The result is a population of homebred koi we call Waterwheel
Homebred F1, first-generation offspring of imported Japanese
parent fish, born and raised on our farm in South Carolina. They
carry the full genetic potential of Japanese bloodlines:
stronger color, truer variety conformation, and better growth
than anything you'll find in domestic pond-quality breeding.
This page is about how we breed them, how we cull them, and what
we're working toward.
WHY JAPANESE BROODSTOCK ONLY
Domestic breeding has its place. We sell domestic pond-quality
koi ourselves, and we're proud of those fish, they bring color
and life to ponds at a price that makes the hobby accessible.
But when it comes to breeding, we made the call that we weren't
going to produce another generation of pond-quality stock when
we had the option to produce something genuinely better.
Japanese breeders have spent over 200 years refining bloodlines.
The fish that come out of Niigata aren't just nicer-looking koi, they're the result of generations of selection for color,
pattern, body shape, growth potential, and longevity. When we
breed from Japanese parent fish, we're tapping into that work.
We get to start where Japanese breeders left off, not where
domestic breeding stalled out decades ago.
Every fish we add to our broodstock comes from one of our
partner farms in Niigata. As we expand our breeder
relationships, we expand our genetic library.
HOW WE BUILD OUR BROODSTOCK
Each year, we import koi from Japan. Of every import that
arrives, we set aside a portion to grow out as potential future
breeders rather than sending them straight to sale. Those fish
go through the same care and observation as everything else on
the farm, but with an eye toward what they might contribute to
the next generation.
We grade them as they grow. The fish that develop into strong,
true-to-variety examples are kept as potential broodstock. The
fish that don't quite meet the mark for breeding move into our
sale inventory. Either way, every fish has a place.
Our culling philosophy applies just as strictly to our
broodstock selection as it does to our F1 sales inventory,
possibly more so. Eventually, our annual import volume will
reach 1,000 koi a year or more. Out of that volume, we might
keep only 20 as potential breeders after the first year. After
another year of growth, observation, and re-evaluation, we might
narrow that 20 down to just 3 or 5 that actually make it into
the active breeding program. Those are the fish we'll spawn
from.
And the selection never stops. If a better example of a variety
comes in next year, those previous breeders will be sold and the
new fish takes their place. The breeding program is always being
improved, never settled.
Our long-term goal is a broodstock of around 120 carefully
selected breeders, enough to maintain genetic diversity across
all the varieties we work with. The Gosanke varieties (Kohaku,
Sanke, Showa) will have multiple breeding trios each, simply
because demand for those varieties justifies the larger
investment. For all other varieties, the target is at least one
breeding trio, one female and two males, per variety.
A closed gene pool is a dying gene pool.
By constantly bringing
in new Japanese blood and constantly re-evaluating our existing
broodstock, we keep our breeding program healthy, varied, and
improving over time.
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OUR APPROACH TO CULLING
Culling is the hardest part of koi breeding and the part that
separates real breeders from people who happen to have spawning
koi. We take it seriously.
Any fry born with deformities or serious health issues are
culled. That's the baseline. After that, the work really begins.
As our F1 fry grow, we begin selecting. We watch for color
development, body shape, pattern formation, and how true each
fish is to the standard of its variety. Fish that show poor
conformation or weak color move down through our grading
structure as they develop. Fish that show real potential keep
climbing.
The fish that don't make the cut for higher grades aren't thrown
away, they're priced honestly. A homebred F1 koi that didn't
develop strong color is still a healthy fish with Japanese
genetics. It just doesn't go into our Select grade. It might end
up in Standard or Quality, sold at a price that reflects what it
actually is. That's not failure, that's honest grading.
The fish that do show strong potential keep moving up:
- Only homebred F1 koi that genuinely conform to variety
standard reach our Select grade. This is where most of our
solid homebred inventory lives.
- Only the very best, the fish that in our judgment come close
to true variety perfection, reach Premium.
- Our homebred F1 will almost certainly never reach Elite. That
tier is reserved for Japanese-bred koi at the absolute top of
their game.
We're not pretending we cull at the level of a Japanese breeder.
The Japanese have generations of family knowledge, infrastructure
designed for mass-selection, and the kind of eye that only comes
from a lifetime in the koi industry.
We cull harder than
domestic pond-quality breeders, but less aggressively than our
Japanese partners. That's exactly why our F1 koi are priced
between domestic and Japanese imports.
You get Japanese bloodlines without paying import prices. You
get higher quality than domestic breeding without paying for
Japanese-level selection. It's the middle path, and for a lot of
hobbyists, it's the best value in the entire hobby.
HOW WE BREED
For now, we breed semi-naturally using selected trios. A
breeding trio consists of one female and two males, paired based
on their conformity to variety standard, their genetic
contribution, and their overall quality as breeders.
We place each trio into a dedicated breeding tank or pond. The
fish spawn naturally, and once spawning is complete, the adults
are removed. The fertilized eggs hatch in the same water, and
the fry are raised there until they're large enough to be moved
to our grow-out ponds.
This approach gives us strong control over which fish are
crossed with which, while still letting the breeding itself
happen as nature intended. We don't currently practice
hand-breeding the way some Japanese farms do, but as our
operation grows and our experience deepens, that's something we
may move toward in the future. For now, selective trios and
natural spawning give us excellent results without the
additional handling stress on the breeders.
Once the fry are big enough, they move to one of our mud ponds
for grow-out. Mud ponds are critical, the natural environment,
the microorganisms in the substrate, and the unfiltered exposure
to sun and seasonal cycles produce stronger, healthier,
better-formed koi than any artificial system can replicate. Our
F1 koi spend their first year in mud, and emerge ready to be
graded, sorted, and either kept as future breeders or moved into
our sale inventory.
COLOR PROJECTS
Beyond our standard breeding program, we have a few color
projects we're working on, crosses we want to attempt for the
sheer joy of seeing what's possible. These aren't projects with
commercial intentions; they're projects driven by curiosity,
with a hope that we might one day produce something unique to
Waterwheel.
Right now, two specific projects we're excited about are Ki
Showa and Ki Sanke, crosses aiming to replace the traditional
Hi (red) of Showa and Sanke with Ki (yellow). The result would
be a koi with the classic Showa or Sanke pattern, but rendered
in black, yellow, and white instead of black, red, and white. If
we can get the Ki to come through strong and clean, and hold the
Sumi (black) at the same level of intensity as a proper Showa or
Sanke, the results could be striking.
These wouldn't be recognized as official varieties under
traditional koi classification. They'd be Kawarimono, koi that
fall outside the named varieties. But if they ever materialize,
they'd be unique to our farm.
We may never get them right. That's part of the work. But koi
breeding has always been about a small number of people
patiently chasing a vision of what could be, and our color
projects are our small contribution to that tradition.
WHAT COMES NEXT
Our breeding program is still in its early years post-rebuild.
We have a strong foundation of Japanese broodstock in place, a
clear culling philosophy, and a long-term plan for how to grow.
Over the next several years, you can expect to see:
- More breeder relationships, bringing more bloodlines into our
genetic library
- A broader variety range as our broodstock matures
- Progress on our color projects
- Eventually, broodstock that we'd be proud to stand next to
anything in Niigata
We're not in a hurry. Good koi breeding never is.