At a glance
Shubunkins are single-tailed goldfish with the swimming ability and long-term space requirements of common and comet goldfish. They are not suitable for bowls or undersized aquariums; mature housing, strong biological filtration and dependable maintenance matter more than decorative accessories.
Aquarium volume is only a starting point: footprint, filtration, stocking, structure and maintenance all affect whether a setup is appropriate.
Related PetGratitude guides
The Shubunkin Goldfish, often referred to as the “Calico Goldfish,” is a popular and vibrant variety of the common goldfish (Carassius auratus). Known for its striking coloration, hardiness, and lively personality, the Shubunkin is a favorite among both novice and experienced aquarists.
Origins and History
The Shubunkin Goldfish originated in Japan in the early 20th century as a result of selective breeding of the common goldfish. The goal was to create a goldfish with a unique calico coloration, combining the hardy nature of the common goldfish with a more colorful and eye-catching appearance. Today, Shubunkins are cherished worldwide for their vivid colors and dynamic presence in both indoor aquariums and outdoor ponds.
Physical Characteristics
Shubunkin Goldfish are distinguished by their bright, multi-colored scales and sleek body shape.
Size: Shubunkins can grow up to 10 to 12 inches (25 to 30 cm) in length, making them one of the larger goldfish varieties. They require ample space to swim and thrive.
Coloration: The hallmark of the Shubunkin is its calico coloration, which includes a blend of red, orange, yellow, black, blue, and white. These colors are randomly distributed across the body, giving each Shubunkin a unique appearance. The presence of blue is particularly prized, as it is relatively rare in goldfish.
Body Shape: Shubunkins have a streamlined, elongated body with well-developed fins. There are three main types of Shubunkins based on fin structure:
- London Shubunkin: Shorter fins, similar to those of a common goldfish.
- Bristol Shubunkin: Longer fins with a distinct heart-shaped tail.
- American Shubunkin: Fins that fall somewhere between the London and Bristol types, with slightly elongated, flowing fins.
Tank Setup and Environment
Providing the right environment is essential for the health and well-being of Shubunkin Goldfish.
Tank Size: Choose housing for the adult fish and the intended number of fish, rather than relying on a fixed gallons-per-fish formula. RSPCA Australia notes that slimmer, more active goldfish need larger and longer aquariums relative to their body size. Shubunkins need open swimming space; assess the footprint, filtration and stocking together before adding fish.
Substrate and Decor: Use a smooth, fine gravel substrate to prevent injury to their delicate fins. Shubunkins appreciate a well-decorated tank with plants, rocks, and driftwood, but ensure that there is ample open swimming space. Avoid sharp objects that could tear their fins.
Plants: Live plants such as Anubias, Java Fern, and Hornwort can provide natural cover and enhance the aesthetic of the tank. However, be mindful that Shubunkins may nibble on soft plants, so choose hardy varieties.
Water Movement: Shubunkins prefer moderate water movement. A good filtration system that maintains clean water without creating too strong a current is ideal. Consider adding an air stone to increase oxygenation, as Shubunkins thrive in well-oxygenated water.
Water Conditions
Maintaining optimal water conditions is crucial for the health and longevity of Shubunkin Goldfish.
Temperature: Shubunkins are cold-water fish and can thrive in temperatures ranging from 65°F to 75°F (18°C to 24°C). They can tolerate slightly cooler temperatures, making them suitable for outdoor ponds in temperate climates.
pH and Hardness: Shubunkins prefer a pH range of 7.0 to 8.4 and moderately hard water. Regular testing of water parameters is essential to ensure a stable environment.
Filtration and Aeration: A robust filtration system is necessary to handle the bioload of Shubunkins, as they are known to produce a significant amount of waste. Regular water changes (20% to 30% weekly) are crucial to maintaining water quality.
Diet and Feeding
Shubunkins are omnivorous and benefit from a varied diet.
Staple Diet: High-quality goldfish pellets or flakes should be the staple of their diet. These foods are formulated to meet the nutritional needs of goldfish and promote healthy growth and vibrant colors.
Supplemental Foods: Supplement their diet with live or frozen foods such as bloodworms, brine shrimp, and daphnia. Occasional treats of fresh vegetables like peas, lettuce, or spinach can provide additional nutrients and variety.
Feeding Frequency: Feed your Shubunkins 2-3 times a day, offering only as much food as they can consume in a few minutes. Overfeeding can lead to water quality issues and health problems, so monitor their intake carefully.
Behavior and Compatibility
Shubunkins are social and generally peaceful fish.
Behavior: Shubunkins are active swimmers and enjoy exploring their environment. They are known for their curious nature and can become quite interactive with their owners, often recognizing them and coming to the surface during feeding times.
Tank Mates: Do not assume that all goldfish varieties are suitable companions. The RSPCA advises against mixing single-tailed and twin-tailed goldfish because slower swimmers can miss out on food. Shubunkins are single-tailed; Orandas are fancy, twin-tailed goldfish and should not be presented as ideal companions for them. Assess any proposed companions by swimming ability, feeding access and available adult space.