Maruhide Koi Farm

Maruhide Koi Farm is a small Ojiya farm that does one thing: Doitsu Gosanke. Hidemasa Hirasawa trained at Isa Koi Farm, Ojiya's big Showa house, and his Doitsu Kohaku, Doitsu Sanke and Doitsu Showa carry the Isa habit of building body first. If you want a Doitsu Showa with volume instead of a thin, pretty one, this is a farm to watch. ChampKoi imports koi from Maruhide.

The farm is in Minaminigoro, Ojiya, Niigata, and is registered with the Ojiya Nishikigoi Fisheries Cooperative as Nishiki Maruhide Koi Farm. Hirasawa has run it as his own operation since 2016, and by dealer accounts stayed on the Isa staff while getting it off the ground. Production is small and the autumn harvest sells out quickly.

Besides the Doitsu trio he breeds scaled Kohaku, Ochiba and Chagoi. His Doitsu fish already place at the national show: a Maruhide Doitsu was runner-up in its size class at the 55th All Japan Nishikigoi Show in 2025, and dealers report Kokugyo and Sakura prizes for his Doitsu Sanke at earlier All Japan and ZNA shows.

Doitsu Gosanke is a specialist's taste. The skin has to be flawless because there are no scales to hide behind, and the best Maruhide fish have that clean, wet-looking shiroji. If you want scaled Kohaku or Showa with a long pedigree, buy Isa or Marudo. If you want the Doitsu version done properly, Maruhide is one of very few Niigata farms that commit to it.