Niigata Breeder: Isa

Located in Ojiya City, Niigata—the historic birthplace of Nishikigoi—Isa Koi Farm is one of Japan’s most respected and influential koi farms. Founded in 1970 by Hajime Isa and now led by second-generation breeder Mitsunori Isa, the farm has become world-renowned for redefining what a Showa can be: powerful, elegant, massive, and refined.

Isa’s legacy is built around the legendary Isa Showa. For many years, Showa were believed to have less jumbo potential than Kohaku or Sanke, but Isa challenged that idea through careful bloodline development. Their Showa are admired for strong frames, deep sumi, bright shiroji, and the ability to mature into large, commanding koi without losing balance or quality.

What makes Isa koi especially exciting is their long-term development. Many young Isa Showa may appear dark or unfinished at first, but as they mature, the white skin clears, the sumi strengthens, and the full structure of the pattern begins to reveal itself. This makes them especially rewarding for collectors who appreciate koi that improve with time.

While Isa is best known for Showa, the farm also produces high-quality Kohaku, Sanke, and Tancho, each carrying the same emphasis on body strength, skin quality, and future potential.

Every quality Isa koi reflects:
✓ Second-generation breeding expertise
✓ Legendary Isa Showa bloodlines
✓ Powerful body structure and jumbo potential
✓ Deep sumi, rich hi, and bright shiroji
✓ The natural development of Ojiya mountain mud ponds

Why Choose Isa Koi?
→ One of Japan’s most respected Showa breeders
→ Known worldwide for powerful, high-quality Showa
→ Selected for structure, skin, pattern, and long-term development
→ Ideal for collectors who value strength, refinement, and championship-level bloodlines

Discover the power and refinement of Isa Koi Farm—exclusive imports available at Genki Koi.