Iguchi Katsunori 

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Koshiji Koi Farm is a long-established and well-known breeder located in Iwada, Nagaoka in Niigata Prefecture. The farm has earned a reputation for producing a wide range of high-quality varieties and for maintaining a large number of mud ponds that allow for strong growth and color development. Koshiji is often recognized for the colorful and diverse selection of koi that come from its harvest each year.

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Specialization

Koshiji Koi Farm produces a broad spectrum of varieties. Among the most recognized are Doitsu Goshiki, Ginga, and Beni Kumonryu, all of which have become closely associated with the farm’s name. They also raise more traditional varieties such as Showa and Kohaku while continuing to refine several metallic and Doitsu bloodlines. Their willingness to experiment with patterns and scale types has made Koshiji a favorite among hobbyists who enjoy unique and expressive koi.

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About the Breeder

The farm is led by breeder Kase Kiyoshi, who is known for his creative and forward-thinking approach to koi development. He is respected for focusing on color strength, clean skin, and standout patterns. Many of the varieties that Koshiji is famous for were developed or refined under his direction. His work has helped establish the farm as a place where tradition and innovation coexist in a natural and balanced way.

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About Iguchi Katsunori

Iguchi Katsunori is a big part of  Koshiji Koi Farm now. Iguchi- San is Kase Kiyoshi San's right hand man and will eventually carry on the next generation of Koshiji Koi Farm.

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In Summary

Koshiji Koi Farm is a respected and innovative breeder in Nagaoka known for a wide range of varieties, especially Doitsu Goshiki, Ginga, and Beni Kumonryu. Led by breeder Kase Kiyoshi, the farm has built a legacy of creativity and quality.  Together, the farm’s history, leadership, and unique breeding approach have established Koshiji as a standout name in the koi world.