Koi in 1968s: Association rules
[500] [read-koinote-12-100] In 1968s, the field log for Koi is headed “Association rules.” The figure kept beside that heading is 80. It is a count or a date from the work, not a rank of the species’ worth. A zoo birthday card does not replace the log. Certified KHV-free papers became as ordinary as a kohaku photo.
Domesticated carp whose Niigata colour mutations became a global pond aesthetic -- not a wild goldfish substitute. 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.
Colour mutants were kept in Yamakoshi rice-terrace ponds in the early 1800s. The 1914 Tokyo Taisho exhibition took them national. The ZNA-centred championship that still sets kohaku, sanke and showa as the Gosanke core classes. After the 1960s export boom, Israeli and US growers scaled food-and-ornamental carp. Butterfly fins are largely a non-Niigata aesthetic.
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.
Keep 1968s, “Association rules,” and 80 together or the note on Koi stops being that year’s record.1968s
Figures to keep
- Year of the note
- 1968s
- Figure to keep
- 80
- Species
- Koi
- Line in the log
- Association rules