Calico Shubunkin Goldfish
Calico Shubunkin Goldfish (Carassius auratus) is a Shubunkin with particularly well-developed calico patterning — the characteristic blue-violet, red, orange, black, and white mottling of the Shubunkin variety expressed in a more complex, high-contrast pattern. 'Calico' designates a richly mottled multi-color pattern, and calico-selected Shubunkins are among the most visually complex goldfish available.
Feeding & Care Tip: Hikari Goldfish floating pellets are the ideal staple for active slim-bodied goldfish — these energetic fish feed readily at the surface. Sera Goldy Color Spirulina enhances and maintains vivid coloration. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp or Hikari Frozen Daphnia. If keeping alongside fancy goldfish varieties, offer Hikari Fancy Goldfish slow-sinking pellets at the same time so the slower fancy varieties can feed at their preferred depth.
The calico pattern in goldfish is produced by the nacreous scale type — a combination of metallic and transparent scaling that allows multiple pigment layers to show simultaneously. The blue-violet tones visible in good Shubunkins are the dark dermal chromatophores showing through the transparent scale areas — a layered color effect unique to nacreous fish.
Keep in groups of two or more. Hardy, active, and excellent for ponds and large aquariums. The calico pattern develops and shifts throughout the fish's life — young fish often look quite different from adults. No two calico fish are identical.
One of the most visually complex goldfish available — the layered multi-color calico pattern creates a fish that is a different visual experience depending on the light angle and the fish's age. Filtration & Water Quality: Goldfish are high-waste fish that require robust filtration — significantly more than most tropical fish of equivalent size. A filter rated for at least twice the tank volume is recommended. Regular partial water changes of 25–30% weekly are essential. Despite their reputation as 'easy' fish, goldfish kept in under-filtered or overcrowded conditions decline quickly. Good filtration is the single most important factor in keeping goldfish healthy and long-lived.
Care & Ideal Parameters
| Difficulty | Easy |
| Temperament | Peaceful — active community fish |
| Typical Adult Size | 12 inches (30 cm) |
| Min. Group Size | 2 minimum |
| Ideal Temp | 50–75°F (10–24°C) |
| Ideal pH | 6.5–8.0 |
| Ideal GH | 5–20 dGH |
| Ideal KH | 3–12 dKH |
| Staple Food | Hikari Goldfish (floating pellets); Sera Goldy Color Spirulina |
| Treat / Supplement | Hikari Frozen or Freeze-Dried Baby Brine Shrimp; Hikari Frozen Daphnia |
| Origin | China (captive-bred — all goldfish are domesticated Carassius auratus) |
| Notes | Calico-selected Shubunkin — highly developed multi-color nacreous pattern. Pattern develops and shifts with age. No two fish identical. Pond and aquarium. |
