Koshiji Koi Farm is a respected family-run breeder located in the heart of Niigata Prefecture, Japan, the historic birthplace of Nishikigoi. With over 50 years of experience, Koshiji has built a reputation for quality, consistency, and focused dedication to traditional koi varieties.
Founded by Ichiro Seki, the farm remains under the care of the Seki family and continues to produce koi with strong Japanese bloodlines and dependable beauty. Specializing in the Gosanke group—Kohaku, Sanke, and especially Showa—Koshiji Koi Farm is known for koi that grow well, maintain balance, and develop striking patterns over time.
LOCATED IN THE KOSHIJI REGION OF NIIGATA
Koshiji Koi Farm benefits from the natural advantages of Niigata’s environment. The Koshiji region is rich in mineral-rich mud ponds, clean spring-fed water, and seasonal changes that support ideal koi growth and color development.
This location has been at the heart of Japanese koi farming for generations, and Koshiji continues to use time-tested methods while adapting to meet today’s collectors' expectations.
The quality of the region's water and the consistency of climate support healthy koi development, producing fish with rich, vibrant color and refined body conformation.
BREEDING PHILOSOPHY AND BLOODLINES
Koshiji’s breeding philosophy centers around quality over quantity. Rather than producing large volumes of koi, the farm emphasizes selectivity, focusing on fewer koi with stronger genetic foundations.
Their koi are bred from established Japanese bloodlines, with specific attention paid to improving color contrast, symmetry, and long-term development. Every season, spawning is planned with precision, and only the strongest fry are selected for continued growth.
This process reflects the farm’s commitment to koi that not only look impressive when young but also have the potential to become true show-quality fish over time.
SPECIALIZING IN SHOWA AND GOSANKE VARIETIES
The standout variety at Koshiji Koi Farm is Showa. These koi are known for their bold sumi, vibrant red hues, and clean white skin. Their patterns are often dramatic, with strong black placement that balances well with the white and red across the body.
Koshiji Showa develop with age, often deepening in color and contrast as they grow, making them highly valued by both hobbyists and competitors.
In addition to Showa, the farm also produces Kohaku and Sanke. Each of these varieties is bred with an eye for balanced patterning and crisp coloration. Whether it’s the simplicity of Kohaku or the elegance of Sanke, Koshiji’s Gosanke koi meet the high standards expected from top-tier Japanese breeders.
BRING HOME A KOSHIJI BRED KOI TODAY!
If you're looking to add a koi with balanced patterning, rich color, and dependable Japanese bloodlines, Koshiji Koi Farm offers an excellent choice. These koi are the result of decades of focused breeding and hands-on care, producing fish that continue to impress as they grow and mature. Whether you're building your pond for the first time or adding to a well-established collection, a Koshiji-bred koi brings beauty and character.
To learn more or get help selecting the right fish for your pond, call us at 908-420-9908 and speak with one of our koi experts today, or Talk to an Expert Online. We're here to help you find the perfect match.
