Overview

Scientific Name: Carassius auratus (variety)

Common Name: Bristol Shubunkin Goldfish

Origin: Developed in Bristol, England in the 1930s from Calico Common Goldfish and London Shubunkin lines

Size: 15–35 cm (6–10 inches)

Lifespan: 10–15 years or longer with proper care

Temperament: Peaceful and social; ideal for ponds or large aquariums

Appearance

The Bristol Shubunkin is a beautiful calico goldfish variety recognised for its distinctive heart-shaped tail and vibrant mix of red, orange, blue, black, and white colours. Its long, flowing fins and metallic speckled scales give it a graceful appearance, while the blue base colour is a hallmark of true Bristol lineage.

Water Parameters

• Temperature: 18–24°C (tolerant of mild outdoor fluctuations)
• pH: 7.0–8.0
• Hardness: 8–20 dGH
• Water Movement: Moderate with efficient filtration

Like all goldfish, Bristol Shubunkins produce a significant amount of waste. Regular partial water changes and a powerful filtration system are essential for maintaining good water quality.

Tank or Pond Setup

• Minimum Tank Size: 150 litres per fish (larger for groups)
• Substrate: Smooth gravel or fine sand
• Décor: Provide open swimming space with gentle water flow; avoid sharp ornaments that may damage fins
• Plants: Hardy, non-toxic species such as Anubias, Hornwort, or Java fern
• Pond Care: Suitable for outdoor ponds in mild climates; ensure shade and adequate aeration in summer

They thrive in well-oxygenated water and should not be kept in bowls or small, unfiltered tanks.

Diet

Bristol Shubunkins are omnivores and should receive a balanced diet to maintain colour and vitality:

• High-quality sinking or floating goldfish pellets
• Vegetable matter such as blanched peas, spinach, or lettuce
• Occasional live or frozen foods like bloodworms, daphnia, and brine shrimp

Feed small amounts two to three times daily, removing uneaten food to avoid fouling the water.

Behaviour and Compatibility

Bristol Shubunkins are peaceful and best kept in groups. They mix well with other single-tailed goldfish such as Commons and Comets, as well as with peaceful pond species. Avoid mixing with slower fancy goldfish (like Orandas or Ranchus) to prevent feeding competition.

Breeding

Bristol Shubunkins are egg scatterers that breed readily in well-maintained ponds or aquariums:

• Condition adults with a high-protein diet
• Spawning typically occurs in spring when temperatures rise
• Provide spawning mops or fine-leaved plants for eggs
• Remove adults after spawning to protect eggs
• Fry hatch in 3–5 days and can be fed infusoria or baby brine shrimp

Conclusion

The Bristol Shubunkin Goldfish is a hardy, colourful, and elegant variety perfect for ponds or spacious aquariums. Its flowing heart-shaped tail and brilliant calico colours make it a favourite among goldfish enthusiasts seeking a classic, active, and easy-to-care-for ornamental fish.