Futoshi Maruyama 

Maruyama Koi Farm is a renowned koi breeding operation located in Isawa, in Yamanashi Prefecture, Japan. The farm was founded in the 1960s by Gensuke Maruyama, and is currently led by his son, Futoshi Maruyama, representing the second generation of this family-run operation.

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Specialization

Maruyama Koi Farm is best known for its premier Kohaku, as well as high-quality Sanke and Showa. The farm gained international acclaim through the development of the famous “Kagura‑Beni,” a vivid and glossy red coloration introduced through a female brood fish named Kagura. This unique strain helped shape the red pigmentation standard seen in many high-end Gosanke today.

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Farm Overview

• Founded: Early to mid‑1960s by Gensuke Maruyama

• Location: Isawa, Fuefuki City, Yamanashi Prefecture, Japan

• Current Owner: Futoshi Maruyama

• Facilities: Medium-scale operation with a focus on controlled, high-quality production of Gosanke, as well as select development of ginrin and jumbo-sized koi.

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Reputation

Maruyama Koi Farm has introduced multiple champion-level koi, including Kohaku and Showa bred from the Kagura bloodline that have won top honors at prestigious shows such as the All Japan Koi Show. Their Kohaku, in particular, are admired for their crisp shiroji (white skin), deep and vibrant beni (red), and strong body conformation. Many koi from Maruyama grow beyond 80 cm, demonstrating excellent long-term potential and genetic strength.

The farm is recognized in the koi community as a pioneer in the evolution of red pigmentation and overall refinement in Gosanke breeding.

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In Summary

Maruyama Koi Farm specializes in top-tier Kohaku, Sanke, and Showa, anchored by its legacy in the Kagura bloodline. Under the leadership of Futoshi Maruyama, the farm continues to produce koi that combine vibrant color, size potential, and show-winning refinement. Its contributions to modern koi genetics have earned it a lasting reputation among serious collectors and breeders around the world.