Nagoshi Koi Farm is in Asahi, a small town on the Toyama coast, about three hours by road from Ojiya. That puts it well outside the Niigata cluster, which is the main reason most hobbyists have never heard of it. The owner is Akihiro Nagoshi. ChampKoi imports koi from Nagoshi.
Kohaku is the core of the farm's production, with Sanke and Showa alongside, and it also raises Asagi and metallic Hikarimuji types. Asagi is where the name comes up among people who know the farm: Nagoshi-bred Asagi took a size-class win at the 52nd All Japan Nishikigoi Show in December 2021, and a Nagoshi Muji won its class at the same show. None of that is headline stuff, and Nagoshi is not a Showa farm or a jumbo specialist.
The reason to buy is value. European dealers who make the drive say the same thing we do: clean, well-kept Gosanke at prices a Niigata name would not match, and an Asagi with proper reticulation when you want one. Expect tosai and nisai rather than trophy sizes.
What we cannot confirm: one dealer lists the farm as founded in 1957 and now in its third generation, but the farm has no website of its own and we could not verify either figure from a second source, so we leave them out.
