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Byer Koi Farm is a UK Koi Farm based in Hertfordshire. We sell Koi Carp, Koi Fry, Small Koi, Tosai and Nisai

About Us

I've always bred fish.  Ever since I was around 5 years old.  My Grandfather was a GP in Leicester, and well known in the Welford Road area for the tropical fish tank in the surgery waiting room.  This was half a century ago, and keeping tropical fish at that time was very difficult without the modern fish keeping equipment we benefit from now.

The interest passed on to my father, and in turn on to me; my early fish memories being as a 5yr old boy breeding Siamese Fighters.  This was surely the start of my passion for fish keeping and in particular, fish breeding.  I bred every fish I kept since I was 5 years old.  Then as an adult with a young family, we inherited a pond through a house move and I started keeping koi carp.  It was only a matter of time before I tackled breeding koi.

The actual breeding process for koi is not as difficult as it is for Siamese Fighting fish.  But with the Siamese Fighters I used to breed, most of the babies end up very pretty and similar to the parents.  Koi do not breed true.  So, breeding koi that also look great and that you'd want in your pond is a huge challenge.  This is especially the case for the most patterned varieties. So sensing a challenge there, I took on Kohaku .. as they are the no. 1 variety in koi’s ‘Go Sanke’, (the ‘top 3’ varieties), and the most heavily competed category on the show circuit.  It was generally thought to be impossible outside of the Japanese koi farms to breed a champion level koi.  Therefore, a prime target for a life challenge, so that's exactly what I took on!

It took years to develop our first Kohaku brood set pairing that worked well enough to produce koi that won awards at koi shows.  And then soon after, I achieved what was thought to be unachievable for a back garden hobbyist breeder.  We won baby champion at the All England Show in 2016 with a stunning Ippon Hi Kohaku.  Winning that major award at the most prestigious show in the UK was the culmination of several champion awards at regional level shows won during 2014-16 with other Kohaku's produced from the same brood set.  A huge life achievement, and recognised internationally with features in koi press around the world.

With the objective complete, I started to think about the what challenge to take on next.   Amanda and I had always wanted our own 'Escape to the Country'  (The well-known TV show haven't been in touch yet though), and more and more people were contacting us about our Kohaku. So the decision was made that Amanda and I would develop Byer Koi Farm together.

Building a commercial scale fish farm has been even more difficult than winning those earlier awards as a hobbyist!  The cost and time involved has been huge.  The expansion took 4 years and I had to work two jobs to help pay for the new facilities, with Amanda picking up a new aquaculture career and manning the phones and seeing customers.

Meeting our amazing customers has been one of the most enjoyable aspects.  They have taught us so much about how people enjoy koi and koi ponds.  We receive lots of love from our customers for our Kohaku's, with some customers also asking us to do for other varieties what we've done for Kohaku.

So this has become our latest challenge and we're enjoying the process of finding new optimised brood set pairings for lots of different varieties from Showa to Ogons and many other varieties in between.  And our customers are loving the wider range with some of these new varieties starting to become as sought after as our Kohaku's.  Our Showa's are a great example.  They've been a toughie to crack and after 3 years and testing 5 different brood set combinations, we finally hit on a pairing that works really well.  And our Ogons are extremely shiny and bright metallic koi that we call our 'Shooting Stars'.  They're very rapid getting on the food, which makes them extremely charismatic and a great addition to any pond.  The superb tall body structure imparted to our Ogons from their mum, plus their seemingly endless desire for more food goes a long way to explaining why they grow so fast.

The beating heart at Byer Koi Farm is our keystone Kohaku range where we continue to push the boundaries in colour quality, pattern and growth potential.  The end result, our customers have been winning even more champion awards with our Kohaku's, and not just from that original Kohaku line, but also from 3 further optimised Kohaku lines too.  In 2020 we had our first cover star; an amazing 'Map of England' pattern style Kohaku winning the top award at a club show and featuring on the front of 'Koi Net' magazine, issue 30.  This koi beat all the other Kohaku's in the competition, across all the sizes.  And also all the koi from the other Go-Sanke (top 3) varieties too.

This consistent champion award winning quality, the extremely high quality and jumbo size of our Japanese koi brood stock all sourced from Japan, and in particular the special combinations that we pair our brood fish each taking years to develop, underpins our production.  When you add that to our continued push towards maintaining the highest customer satisfaction, you get the essence of what makes Byer Koi Farm so special.

It's very important to us that our customers enjoy their experience from our koi.  Whether that be in the colour, the pattern or sheer growth from the koi they purchase; or in taking part in the annual competitions we run.  Hundreds of customers have now taken part in those annual competitions, and they are well worth watching out for.  They always have a common theme, which is to take a spawning that has performed particularly well that summer and to offer our customers the opportunity to buy koi from that spawning in the autumn that we'd otherwise be keeping until the spring; and we add a fun aspect to it like awarding prizes for the best pattern development or sheer growth.  That was what we did for our 'Shooting Stars' and 'Hey Presto, Showa!' events.  And in last year's 'Clash Of The Titans' event we added an extra awarding category... which is for award the most friendly koi to be judged based on it's enthusiasm for feeding.

We understand the provenance of all the koi we sell, because we bred them.  So, whether a customer is interested in a koi for showing, a fantastic individual specimen or a mix of koi to brighten their pond, we are always happy to spend time to help them pick the right koi from our spawnings that has the traits they will most value and enjoy.

At the beginning of my koi breeding project as a hobbyist, I took on a challenge thought to be unachievable to strive for a personal life goal and also to increase interest in koi bred in the UK.  Pushing the boundaries is in our DNA, and now with Byer Koi Farm being a leading UK koi farm consistently producing champion winning koi, we are elevating the quality and perception of UK bred koi and driving the industry forwards.

Thank you to all our customers for your continued interest in Byer Koi Farm.

Adam Byer.


Byer Koi Farm is a family run business.



Customers love the sales room we built in 2019 which has made browsing for koi much more comfortable.  You can find us on Google Maps and Apple Maps, and we have a car park opposite the sales room.

You'll find our stand at the the major koi shows, like the BKKS National and All England Koi shows each year.  


We also attract koi kichi (people who love koi).  They love seeing our koi and the process we go through to produce them.  We enjoy having some help at the farm from koi kichi like Tony who has been regularly helping out since 2019.


Our facilities include outdoor natural ponds , our sales room and also many recirculation systems within polytunnels where we run spawnings, and rear koi over the winter.