- Common Name:
Ryukin Goldfish
- Scientific Name:
Carassius auratus
- Variety:
Fancy Goldfish – Ryukin
- Approximate Size:
9cm
- Adult Size:
Approximately 15–20cm+, with larger specimens possible
- Temperament:
Generally peaceful
- Care Level:
Easy to moderate
- Minimum Tank Size:
Approximately 75–100 litres for one adult, with significantly more space required for additional goldfish
- Temperature:
Approximately 18–24°C
- pH:
Approximately 6.5–8.0
- Diet:
Omnivorous
- Aquarium Level:
All levels
- Lifespan:
10+ years with appropriate care
Feeding
Ryukin Goldfish benefit from a varied, high-quality diet.
Suitable foods include:
- Quality sinking goldfish pellets
- Gel foods
- Suitable fresh or blanched vegetables
- Frozen brine shrimp
- Daphnia
- Other appropriate goldfish foods
Sinking foods are generally preferred for fancy goldfish as they can help reduce the amount of air swallowed while feeding at the surface.
Feed appropriate portions and avoid overfeeding.
Aquarium Care
Ryukins produce a considerable amount of waste and require good filtration and regular aquarium maintenance.
A suitable aquarium should provide:
- Strong biological and mechanical filtration
- Regular partial water changes
- Good oxygenation
- Plenty of open swimming space
- Smooth substrate
- Smooth rocks and decorations
- Stable water parameters
- Adequate space for adult growth
Avoid sharp decorations that could damage their body or flowing fins.
Tank Mates
Ryukins are generally best kept with other appropriately sized fancy goldfish.
Suitable companions may include:
- Other Ryukins
- Orandas
- Fantails
- Ranchu
- Other compatible fancy goldfish
Ryukins can be relatively strong and enthusiastic feeders. When keeping them with slower fancy goldfish varieties, ensure all fish are receiving adequate food.
Body Shape & Colour
The Ryukin is particularly recognisable for its:
- Deep, rounded body
- Pronounced shoulder or dorsal hump
- High back
- Flowing fins
- Distinctive fancy goldfish profile
Colour and pattern can vary considerably between individuals.
Goldfish colouration can also change as the fish matures due to genetics, age, diet, lighting and environmental conditions.
Important Information
Ryukins can become considerably larger than their juvenile size and require an appropriately sized, filtered aquarium.
They should not be kept in small bowls or unfiltered containers.
Good water quality, adequate swimming space and an appropriate diet are essential for maintaining healthy fancy goldfish over their potentially long lifespan.
