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Ojiya, Niigata Prefecture, Japan · since 1970

Isa Koi Farm

The house

Isa Koi Farm was founded in 1970 by Hajime Isa in Ojiya City, Niigata Prefecture, and is now run by second-generation breeder Mitsunori Isa. The farm operates roughly 70,000 square meters across 31 mud ponds and built its reputation on 'Isa Showa,' a bloodline recognized for powerful, well-balanced bodies and dramatic contrast between jet-black sumi and deep red-and-white skin, while growing to larger sizes than Showa were traditionally believed capable of reaching without losing body quality. Isa also breeds Kohaku and Taisho Sanke alongside its signature Showa line, and the farm has become one of the most sought-after breeders in the Niigata region.

Notable

  • Multiple Kokugyo (Best in Size) awards at the All Japan Nishikigoi Show for Isa Showa bloodline koi

Isa Koi Farm koi in stock at US dealers

All 36 →

US dealers importing from Isa Koi Farm

Genki Koi

Unclaimed

San Jose, CA Ships nationwide $$ $$$ show

Genki Koi is a San Jose, California koi importer founded in 1997, run by owner Kevin who travels to Japan several times a year to hand-select fish from more than 50 Niigata and Hiroshima breeders including Dainichi and Isa. It sells a broad range of traditional and metallic varieties online with nationwide shipping.

  • Asagi Koi
  • Bekko Koi
  • Doitsu Koi
  • Gin Rin Koi
  • +8 more

Kodama Koi Farm

Unclaimed

Mililani, HI Ships nationwide $$ $$$ show

Kodama Koi Farm has been farming koi in Mililani, Hawaii since 1969 and operates as both a breeder and a major importer, running weekly online auctions of fish sourced directly from top Niigata breeders such as Dainichi, Isa, and Marudo. It ships nationwide by air cargo from Hawaii and runs an additional retail location, Kodama Koi Garden, in New York.

  • Kohaku Koi
  • Showa Koi
  • Sanke Koi
  • Shiro Utsuri
  • +9 more
Sources for this profile (2)