01 Spawn on media
Adhesive eggs on spawning mops or plants in spring warmth.
Darker cells mean a higher score for this topic on that metric.
Speed18
Intelligence45
Range12
Resilience94
Cultural impact64
Ecological role18
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Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
Are koi just goldfish?
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.
Operating a koi life is a loop: sense, decide, act, and stay inside an energy and legal envelope.
Steps are type-level -- hunt, migrate or spawn -- not a promise that every individual follows the same film sequence.
Principles
Energy in, work out
Omnivorous pond browsing -- pellets, plants, invertebrates. Winter metabolism drops in unheated outdoor ponds.
Information before motion
Taste barbels and a lateral line in still water. Show judging is a human sense laid over the fish.
Replacement rate
Slow breeders (whales, apes, albatrosses, tigers) cannot outrun a short political cycle. Fast clutch species still fail if the nest site vanishes.
Place is part of the phenotype
A koi without its lake, ice, anemone or gravel is a different, usually failing, animal.
Human systems are now habitat
Quotas, feeders, reserves and films rewrite survival as much as weather. KHV, poor water, and escape into wild basins. A champion pattern does not confer disease immunity.
Diagrams
Koi forage / hunt loop
Sensesense
Orientmove
Strikeact
Handlehandle
Spawninvest
Recruitleave
Koi life-cycle loop
Hatchstart
Reargrow
Movemove
Feedlearn
Spawnbreed
Die or repeatend
Life-cycle steps
02 Hatch and sort
Breeders cull for pattern in the first months -- the hidden labour of nishikigoi.
03 Grow in mud ponds
Niigata summer ponds build body; autumn harvest is a ritual.
04 Select Gosanke
Kohaku, sanke, showa leave the pond; the rest become food or feeders.
05 Quarantine on sale
KHV papers and temperature stress tests precede export.
06 Show or garden
A few enter championship vats; most live as suburban colour.
Hard limits
Physiological envelope
KHV, poor water, and escape into wild basins. A champion pattern does not confer disease immunity.
Place dependence
Without the breeding site or forage pulse, brochure behaviour is theoretical.
Human and legal limits
Quotas, listings and trade rules now bound real populations as tightly as weather.
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