Yamasan Koi Farm is one of Niigata’s most versatile and dynamic breeding operations, located in the Ojiya and Kawaguchi region of Japan. Established in 1973 and operated by Manabu Yamazaki, the farm has grown into a premier destination for collectors seeking both variety and quality in one place. Known for its large-scale yet carefully managed production, Yamasan blends high volume with refined standards, making it a true one-stop farm in the Niigata region.
Spanning approximately 10 acres and featuring more than 50 mud ponds, Yamasan Koi Farm has the infrastructure to support significant growth cycles while maintaining hands-on oversight. The layout of the ponds and rearing facilities allows for efficient development and careful monitoring, ensuring koi are raised in conditions that promote both size and color refinement.
A LEADER IN BUTTERFLY AND METALLIC KOI
Yamasan Koi Farm is especially renowned for its Hirenaga, commonly known as Butterfly koi, as well as Hikarimono metallic varieties. Among its standout offerings is Lemon Hariwake, a striking metallic koi that combines luminous yellow tones with crisp white contrast and flowing fins.
The farm’s Butterfly koi are bred for length, elegance, and strong body lines that complement their extended fins. These koi offer a dramatic visual presence in any pond and are favored by hobbyists who appreciate movement and shimmer in addition to traditional pattern balance.
FAST-GROWING GOSANKE WITH STRONG STRUCTURE
Beyond its metallic and longfin specialties, Yamasan also produces fast-growing Gosanke, including Kohaku, Sanke, and Showa. These koi are developed with attention to body frame, skin quality, and competitive potential, particularly at the tosai and nisai stages.
The farm has built a reputation for producing young koi that show strong early development while retaining the structure necessary for continued growth. This balance makes Yamasan koi appealing to collectors who want both immediate visual impact and long-term potential.
ADD A YAMASAN KOI TO YOUR POND TODAY
Fitz’s Fish Ponds works directly with Yamasan Koi Farm to select koi that reflect the farm’s diversity, growth potential, and visual appeal. Our team visits Niigata to hand-pick koi based on structure, coloration, and standout characteristics that will thrive in both private ponds and competitive settings.
Whether you are drawn to the elegance of Butterfly koi, the shimmer of metallic varieties, or the strength of fast-growing Gosanke, Yamasan koi offer exceptional variety backed by decades of breeding expertise.
Browse our selection of Yamasan koi today and experience the scale, diversity, and craftsmanship of one of Niigata’s most versatile koi farms. Need help making your choice? Reach out to a koi expert online or call Fitz’s Fish Ponds at (908) 420-9908.
YAMASAN KOI FARM FAQS FOR COLLECTORS AND POND ENTHUSIASTS
What is Yamasan Koi Farm?
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Yamasan Koi Farm is a breeder based in Niigata, Japan, known for producing koi with bold color patterns and classic Japanese lineage.
What Koi Varieties Does Yamasan Specialize In?
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They focus mainly on Gosanke, Kohaku, Sanke, and Showa, but also produce select Doitsu varieties with clean scale lines and vibrant color.
Why Are Yamasan Koi Popular With Collectors And Pond Owners?
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Their koi often show deep, rich colors and clear pattern separation, making them a strong addition to any pond or collection.
Are Yamasan Koi Raised Only In Japan?
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Yes. All Yamasan koi are bred and raised at their farm in Niigata before being carefully selected and shipped to partners like Fitz’s Fish Ponds.
Can Yamasan Koi Live In Backyard Ponds In The U.S.?
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Absolutely. With steady water care, good filtration, and seasonal attention, these koi can become focal points in backyard ponds of any size.
Do Yamasan Koi Require Special Attention?
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While their care is consistent with standard koi practices, maintaining clean water and steady feeding schedules helps them reach their full visual potential.
How Are Yamasan Koi Shipped?
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They’re packed in oxygenated bags, insulated boxes, and shipped overnight to ensure safe delivery with minimal stress.
What Makes Yamasan Koi Different From Other Breeders?
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Yamasan koi are known for clean lines, deep reds, and strong contrast in all three Gosanke varieties. Their fish age well and retain pattern structure as they grow.
Why Choose Yamasan Koi From Fitz’s Fish Ponds?
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We hand-pick koi directly from Yamasan, focusing on visual strength and color clarity. Our team ensures each fish is well-suited for American ponds.
