Producing Regions & Public Facilities
Yamakoshi and Ojiya in Niigata, Hiroshima's second axis, export gates, other public displays, the koi year, and visiting etiquette.
The full list sits in the frame below — it scrolls inside the frame so the rest of the page stays close.
The mountain hamlets of Nijumurago, where coloured carp first appeared among food carp in terraced ponds.Ojiya & Nishikigoi no Sato
Ojiya City's public koi museum — indoor viewing ponds, a Japanese garden pond, and some forty varieties on display.How Ojiya Production Works
Ponds, parent fish, selection and the autumn harvest — the production system behind the birthplace city's fish.Niigata Beyond Ojiya
Uonuma and the wider Chuetsu hills — the rest of the home prefecture's koi geography.Hiroshima — The Second Great Producing Region
Mihara and Kure — a high-grade producing region built on Kohaku, Sanke and Shiro Utsuri lineages.Producing Regions, Quarantine & Export Gates
Why a region's fish can or cannot travel — export qualification as a fact of production geography.Other Public Places to See Nishikigoi
Beyond Ojiya — how to judge a public koi display, and what this guide lists and leaves out.The Koi Year — Shows, Harvests & Seasons
The annual rhythm that ties regions and shows together, from January's All Japan show to autumn's harvest.Visiting Koi Facilities — Manners & Rules
Photography, feeding and breeder visits — the rules differ by facility, and this page explains how to read them.
Sources: Wikipedia (CC BY-SA — summary in our own words, credit only); All Japan Nishikigoi Promotion Association official; Ministry of Agriculture, Forestry and Fisheries (MAFF) and Finance Ministry trade statistics as published; Japanese Agricultural Standard (JAS) for nishikigoi variety names and definitions (2022); Niigata Prefecture, Ojiya City, Nagaoka City (Yamakoshi) and Nishikigoi no Sato official; Japan National Tourism Organization (JNTO) visitor statistics; USDA APHIS and Australian DAFF official import guidance. Checked 6 November 2026.