Ryukin (fancy)
Carassius auratus
Ryukin (fancy) (Carassius auratus) — Intermediate care, Peaceful, under Goldfish. Minimum tank in the app: 37 US gal min; aim for 61–73°F and pH 6.5–8. Ryukin goldfish appeal to aquarists seeking unique body shapes and engaging personalities.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
East Asia
- East & Southeast Asia
Regional colours match the stocking calculator’s origin map.
Ryukin (fancy) Tank Setup
Aim for a spacious layout with gentle water flow and stable temperatures. Incorporate varied substrates to mimic natural conditions, and use plants or decorations to create hiding spots without obstructing open swimming areas. Lighting should be moderate to prevent stress from harsh glare, which can impact their buoyancy and overall comfort.
What Do Ryukins Eat?
They are omnivorous and will eagerly consume a variety of foods, but they can be slow eaters, making them vulnerable to faster tank mates. A diet rich in high-quality pellets and occasional vegetable matter promotes health and enhances coloration.
Ryukin (fancy) Tank Mates
Ryukins are compatible with other peaceful species of similar size, such as other goldfish or non-aggressive community fish. Avoid fast or aggressive species that might outcompete them for food. When housed with others of their kind, ensure ample space to prevent squabbles over territory, as they can become competitive around feeding times.
Are Ryukins Good for Beginners?
We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. Overfeeding is a frequent pitfall, leading to buoyancy problems and health issues. neglecting water quality can exacerbate their sensitivities.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




