SHOP KOI FISH ONLINE FROM YAMANAKA OYA KOI FARM, FIND STUNNING VARIETIES FOR YOUR POND

Yamanaka Oya Koi Farm is a respected breeder in the Niigata region of Japan, known for producing koi that showcase refined, traditional patterns with a modern visual edge. Operated by Katsunori Miya, the farm has gained recognition for its deep commitment to producing outstanding Showa and Sanke, particularly those with clean patterning, solid structure and rich coloration.

Originally established by his father, Yamanaka Oya Koi Farm has steadily earned its reputation through consistent focus on high-caliber Gosanke. The farm’s Showa are known for strong sumi patterns and smooth integration of red and white, while their Sanke carry a crisp, well-placed black overlay that blends beautifully with the base colors. These koi aren’t bred for mass production — they’re developed slowly and selectively, which makes each one stand out.

In addition to its core Gosanke focus, the farm also produces some limited Doitsu types and other scaled variations that add contrast and interest to collections. With carefully managed mud ponds and indoor systems, Yamanaka Oya offers koi that are visually balanced and built to develop with time, maintaining their beauty as they mature.

Fitz’s Fish Ponds works directly with Yamanaka Oya Koi Farm to hand-select koi each year during our visits to Niigata. We look for koi that offer the clean patterns, vibrant coloration and pond presence that define this breeder’s legacy. Whether you’re after a classic Showa or a uniquely marked Sanke, Yamanaka Oya koi are a reliable addition to any pond.