Masayuki Sekiguchi 

Sekiguchi Koi Farm (officially Sekiguchi Koi Farm) is a notable koi breeding operation located in Minami-Uonuma, near Ojiya City in Niigata Prefecture, Japan. Founded in the mid-20th century by Kosuke Sekiguchi, the farm is now operated by his grandson, Masayuki Sekiguchi.

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Specialization

Sekiguchi Koi Farm is internationally recognized for its elite Showa Sanshoku (Showa). Under Masayuki's leadership, the farm produces Showa with deep, lacquer-like sumi, clean white skin (shiroji), and bold red (hi) patterns. Their bloodlines are influenced by Izumiya and Kanezo strains, known for enhancing both color quality and body conformation. Sekiguchi is also noted for its Pearl Ginrin koi—a unique trait selectively developed at the farm.

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Farm Overview

• Founded: Mid-20th century by Kosuke Sekiguchi

• Location: Minami-Uonuma, Niigata Prefecture, Japan

• Current Owner: Masayuki Sekiguchi

• Facilities: Approximately 40,000 m² of breeding space, including mud ponds and indoor facilities for raising tosai and jumbo koi

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Reputation

Sekiguchi Koi Farm is widely respected among collectors for producing Showa with strong sumi development, sharp contrast, and excellent growth potential. Their koi often feature in high-level competitions and have won top prizes, including Grand Champion awards at major Japanese koi shows. The farm follows a low-volume, high-selection breeding model to maintain consistently high standards in each generation.

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In Summary

Sekiguchi Koi Farm specializes in top-tier Showa Sanshoku, bred with careful attention to sumi placement, skin quality, and long-term development. Under Masayuki Sekiguchi’s guidance, the farm has built a global reputation as one of Japan’s premier sources for powerful, aesthetically balanced Showa koi.