Koi is one of 24 types in this animals atlas. The pages treat it as a full system -- history, anatomy, operating principles, culture, icons, future pressure and market shape -- not a ranking of a best species.
Scores compare the koi with the other 23 types on speed, intelligence, range, resilience, cultural impact and ecological role. They are relative editorial marks. Resilience high means more secure; low means threatened. Domestic and abundant; wild common carp are invasive in many basins. Resilience here means the ornamental lineage is secure, not that escaped koi are harmless.
Seven chapters follow: origins, systems, how the animal works, cultural life, named icons, what conservation can still change, and how tourism, conflict, fisheries and parks move money.
Deep introduction
Deep dive: Koi
Koi is not a single postcard animal. It is a set of populations, subspecies and human rules inside the fish family of this atlas.
Diversity, bodies, culture and ranges — plus a lens tuned to this language region.
Diversity inside the type
Field guides collapse many lineages into the word koi. Subspecies, flyways and captive lines do not share one fate.
This atlas picks a Wikipedia title as the hero image and then keeps the rest of the grade in view so a recovered stock cannot launder a Critically Endangered cousin.
Life in the landscape
A heavy-bodied cyprinid with barbels and a pharyngeal mill. Ornamental lines select skin cells, not wild streamlining.
Culture met the koi through film, law, heraldry, zoos and local story. Those portrayals move money and sometimes take; they are not a field census.
The culture chapter dates posters and statutes so a 1975 film or a 1961 logo cannot pretend to be a 2020s Red List.
Conservation and money
Domestic and abundant; wild common carp are invasive in many basins. Resilience here means the ornamental lineage is secure, not that escaped koi are harmless.
Tourism, conflict payments, quotas and captive loans are dated economic bands in the market chapter -- not live prices and not a best-species prize.
Life-science deep dive
Biology deep dive: Koi
Koi biology is a stack of structure, energy, sensing and hard limits. The four sections below are the same headings used across the atlas so types can be compared without a best-species frame.
Anatomy, senses, behaviour and limits — plus field language for this region.
Structure
A heavy-bodied cyprinid with barbels and a pharyngeal mill. Ornamental lines select skin cells, not wild streamlining.
Load paths and tissues (not metals) are expanded in the anatomy chapter.
No. Goldfish descend from Prussian carp (Carassius). Koi are ornamental common carp (Cyprinus carpio) fixed in Niigata. The atlas seeAlso cannot point at goldfish because that id is not in the taxonomy.
When did nishikigoi become a breed?
Colour mutants were kept in Yamakoshi rice-terrace ponds in the early 1800s. The 1914 Tokyo Taisho exhibition took them national.
What is the All Japan Koi Show?
The ZNA-centred championship that still sets kohaku, sanke and showa as the Gosanke core classes.
Why do Israeli and US farms matter?
After the 1960s export boom, Israeli and US growers scaled food-and-ornamental carp. Butterfly fins are largely a non-Niigata aesthetic.
What did KHV change?
Koi herpesvirus outbreaks from the late 1990s killed whole collections. Quarantine and certified-free stock became the new entry ticket.
Are escaped koi a conservation problem?
Common carp are invasive in many rivers and lakes. A show pond is secure; a flood overflow is not a garden anymore.
Did Monet paint koi?
Giverny water lilies host carp in the public mind. The nishikigoi fancy is Japanese; the Impressionist pond is a later cross-reading.
Why is resilience scored high?
The ornamental lineage is mass-bred and not Red-Listed. High resilience here means secure stock, not ecological innocence.
Role, not a winner
Conservation literacy. Not a live IUCN fetch.
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Similar species
Closest neighbours on the six atlas axes — speed, intelligence, range, resilience, culture and ecological role.
