Carassius auratus
A Ranchu with net-transparent (reticulated) scales: each scale has shiny and matte parts, and together they create a net-like sparkle. The scale type is genetically different from the calico-type transparent scales of the Sakura Ranchu.
Momiji ('autumn leaf') Ranchu is a Ranchu — dorsal-less with a developed head growth — that carries net-transparent scales. In these scales a transparent base has a normal-scale rim, or the reverse, so each scale has shiny and matte parts and together they look like a net. 'Momiji' is the name for goldfish with this scale type, and it also appears on other body types, such as the Momiji Wakin and the blue-based Ao-momiji. The variety most easily confused with it is the Sakura Ranchu, which has mosaic transparent scales (a mix of normal and transparent scales, calico type); net-transparent scales are said to be a completely different genetic expression from calico-type transparency. Colors are mostly solid red, red-and-white and white, and the net-like sheen on red is likened to autumn leaves. Body shape and care are the same as the parent Ranchu, viewed from above. Who developed it and when are unclear. Supply is limited, and goldfish specialists treat it as a separate category. The Ranchu is traditionally enjoyed from above, in the Japanese 'uwami' (top-view) style.
The Momiji Ranchu lives 10-15 years.
The ideal temperature for the Momiji Ranchu is 20〜23℃.
Origin
The country, breeder and date of development are unclear
Lifespan
10-15 years
Temperature
20〜23℃
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
Accepted name: Carassius auratus (Linnaeus, 1758)
Synonyms: Cyprinus auratus Linnaeus, 1758, Carassius auratus auratus (Linnaeus, 1758)
Authority databases: GBIF · GBIF: Carassius auratus · FishBase: Carassius auratus · 日本らんちう協会
Nomenclature follows global taxonomic authority databases.
Goldfish (Carassius auratus) are not listed in the CITES Appendices (checked on Species+, 2026-09-23) and are not designated Invasive Alien Species in Japan. Never release pet goldfish into rivers or ponds.
Sources: Species+ (CITES) / Ministry of the Environment: list of Invasive Alien Species
Regulations may change. Always verify the latest information with the relevant authorities.
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Omnivore (goldfish pellets as the staple; also bloodworms and daphnia)
Each scale has shiny and matte parts that form a net-like sparkle; the Sakura Ranchu instead shows a patchy mix of normal and transparent scales.
The ideal range for fancy goldfish is about 20-23°C, pH around 7.0-8.4. Avoid sudden changes in temperature or water chemistry.
Allow roughly 38 L (10 gallons) or more per adult fish; as a top-view variety, a wide, shallow container also works well.
Dorsal-less and slow; keep with other Ranchu or dorsal-less varieties.
Feed goldfish pellets as the staple in small portions several times a day.
The sheen of net-transparent scales changes with the lighting; when choosing, check both the scale sparkle from above and the Ranchu body shape.
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for Momiji Ranchu is 20〜23℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Momiji Ranchu is 10-15 years. With proper care and nutrition, they can live a long and healthy life.
Momiji Ranchu feeds on: Omnivore (goldfish pellets as the staple; also bloodworms and daphnia). Aim for a balanced diet with appropriate feeding frequency.
The price of Momiji Ranchu varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.
Last updated: October 2, 2026