*Ends November 30th 2025. T&Cs apply.
Bring the elegance of Japan’s most iconic ornamental fish to your pond with our exclusive selection of Japanese Koi for Sale UK. Every koi we offer is hand-selected from trusted breeders throughout Japan, including Ojiya, Niigata – the birthplace of Nishikigoi – ensuring the very best standards of health, colouration, and body shape.
We have been selecting koi direct from Japan since 1988 – that’s over 37 years of experience working with the most respected breeders in Niigata. Our long-standing relationships with Japan’s most famous bloodlines and breeders mean we can offer truly exceptional koi fish that stand out for their beauty and pedigree.
At Koi Water Garden, we’re proud to offer the largest facility in the UK, with 75 ponds and over 300,000 gallons of water dedicated to koi. This allows us to house and care for an enormous range of fish in the very best conditions.
We stock koi across a wide range of varieties, sizes, and origins, making it easy to find the perfect addition to your pond. Whether you’re searching for your very first koi or looking to expand an established collection, we provide only fish of exceptional quality.
Choose from the most sought-after varieties, including Kohaku, Sanke, Showa, Shusui, Ogon, and more. Each variety has its own unique colouration and patterning, allowing you to curate a pond that truly reflects your taste.
With a massive selection from 10cm to 90cm+, our koi range caters to everyone -From young tosai koi (10–15cm), perfect for new koi keepers, to impressive jumbo koi (60cm+), ideal for collectors, our range gives you the flexibility to select fish that will thrive in your pond environment.
Many of our koi are imported directly from Niigata, Japan – the birthplace of koi breeding – and you can read more about our trips in KWG in Japan.
These aren’t just fish, they’re living works of art that transform any pond into a stunning display. Whether you’re new to koi keeping or an experienced collector, our koi bring elegance, movement, and tranquility to every garden.
Each koi is photographed individually, so when you buy Japanese koi online, you can be confident that the fish you see is the exact one delivered to your door.
Not sure where to begin? Our koi buying guide is here to help you make the right choice based on your pond size, experience, and goals.
Smaller koi (10–20cm) are hardy and affordable, making them perfect for first-time pond keepers. They’re easy to acclimatise and provide the rewarding experience of watching them grow.
If you’re seeking something special, we maintain over 300+ jumbo koi always in stock, sourced directly from the top Japanese breeders. These rare, high-grade fish often become the focal point of any pond or collection.
Always match the koi to your pond. Large koi require bigger spaces and more advanced filtration systems, while smaller koi adapt well to modestly sized ponds. If you’re planning a new pond, our Pond Construction Services ensure you’ll have a habitat designed with koi health and growth in mind.
For more guidance on selecting and caring for koi, explore our detailed articles such as Best koi to choose for a pond and How to care for koi fish in your pond.
Healthy koi are the foundation of a vibrant pond, which is why we place such importance on care. Every koi we sell undergoes a strict quarantine process, and we are proud to operate the highest-rated quarantine facility and procedure by CEFAS in the UK. This ensures only the strongest, healthiest fish are made available for sale.
To keep your koi thriving:
Invest in a reliable system for clean, oxygen-rich water. For equipment advice, see our Air Pump Advice or learn about our KWG Filter Room Installations.
Provide a balanced, high-quality koi diet that changes with the seasons. See our Seasonal Koi Feeding Tips to understand how feeding impacts growth and health.
Test your pond water regularly for pH, ammonia, nitrite, and nitrate. Our guide on Water Quality Management for Healthy Koi will help you maintain stable conditions.
For professional support, our Fish Health Visits service ensures your koi remain in peak condition all year round.
Buying koi online should be safe and stress-free. That’s why we’ve made the process simple:
Buy Japanese Koi for Sale UK online through our secure checkout system.
Your fish will be professionally packed in oxygenated bags and insulated boxes. Learn more about our process in Fish Packing & Transportation.
We offer nationwide delivery via specialist couriers trained in fish handling, or flexible collection from our facility. See Visit Us for details.
When you purchase with us, you can be confident that your koi will arrive healthy, stress-free, and ready to thrive in its new pond.
There are many suppliers offering koi, but here’s why our customers continue to choose us:
We hand-select koi from the world’s most famous bloodlines & trusted Japanese breeders, carefully chosen for their health, patterns, and body conformation.
Every koi is individually photographed and priced, so there are no surprises, the fish you see online is the one you receive.
We have over 37 years of experience sourcing and caring for koi direct from Japan. So whether you’re brand new to koi keeping or a seasoned collector, our team is here to guide you at every stage. Explore our News & Insights for ongoing care advice and koi stories.
With years of experience in shipping koi across the UK, we guarantee a safe, professional service. We have the highest-rated quarantine facility in the UK, accredited by CEFAS. This means that our Quarantine & Biosecurity measures ensure every fish leaves us in top health.
Explore our collection today and find the perfect Japanese Koi for Sale UK to bring colour, character, and elegance to your pond.
You can buy Japanese koi directly from our website. Every fish is individually photographed, and the one you see is the exact koi delivered to you. We provide secure checkout and nationwide delivery for complete peace of mind.
Koi are packed in oxygen-filled bags and insulated boxes to maintain temperature and water quality. Learn more in our article on Safely Transporting Your Koi Fish.
Koi are hardy and adaptable, making them suitable for most UK ponds. With proper filtration, aeration, and routine water testing, they can live for decades. For tips, see our Ultimate Guide to Keep Your Koi Thriving.
Smaller koi (10–20cm) are a great starting point. They’re cost-effective, settle quickly into new environments, and allow you to enjoy watching them grow. Larger koi are ideal for those with spacious ponds and robust filtration systems.
Yes, every koi is quarantined and closely monitored before sale. Read more about our KWG Japanese Koi Quarantine Procedure to see how we keep our stock healthy.
Absolutely. Koi can live peacefully with goldfish and other coldwater pond fish, provided your pond is spacious and water quality is maintained.