Overview
The Ryukin Goldfish (Carassius auratus var.) is a intermediate freshwater species known for its red-white, calico coloration. Deep body with humped back. Mid.
Origin & Appearance
Origin: Japan.
Colors: Red-White, Calico.
Body Shape: Deep Fusiform (oval/robust). Typical adult dimensions: 25.0 x 5.0 x 10.0.
Sexual Dimorphism: Subtle; males develop breeding tubercles in spring.
Tank & Water Requirements
| Min Tank Size | 40 gallons |
| Temperature | 59–75°F |
| pH Range | 7–8 |
| Water Hardness (GH) | 8-20 |
| Bioload | high |
| Oxygen Demand | medium |
| Plant Safe | mostly |
| Aquarium Position | Mid |
Behavior & Activity
Slow deep-bodied swimmer; humped back creates distinctive waddling motion; moderate agility for a fancy
Speed: 30/100Aggression: 1/10diurnalSchooling (2+)
Breeding
Moderate; egg scatterer; needs cold period
Common Diseases
💊 Ich
Expert Notes
Deep body with humped back