Fantail Fish
History
The fantail goldfish (Carassius auratus), a popular variety of ornamental goldfish, is well-known for its striking, fan-shaped tail that fans out gracefully, giving it a majestic and elegant appearance. Fantail goldfish originated from China, where goldfish breeding began over a thousand years ago. Through selective breeding, the fantail was developed as a variant with a unique tail shape and a hardy disposition that has made it a favorite in home aquariums. Fantail goldfish are often sought after for their calm temperament, bright colors, and distinctive appearance, making them a desirable species for both beginner and experienced aquarists. They are a member of the goldfish family and share the same species as other popular varieties like the common goldfish and the comets.
- Weight: Fantail goldfish typically weigh around 1-2 ounces (30-60 grams).
- Length: They can grow up to 6 to 8 inches (15 to 20 cm) in length, though some may reach larger sizes in spacious tanks or ponds.
- Lifespan: Fantails are relatively long-lived fish, with a typical lifespan of 10 to 15 years when properly cared for, though they can live even longer in ideal conditions.
- Coats: Fantail goldfish have smooth, shiny scales that come in a variety of colors, including gold, orange, red, black, and white, often with variations in color patches or patterns.
- Colors: The most common colors for fantail goldfish are orange and gold, but they can also appear in variations of red, white, and black.
- Patterns: Fantail goldfish can have solid color patterns or multicolored bodies with combinations of orange, red, and black markings.
Height
Weight
Lifespan
Appearance: What They Look Like
Fantail goldfish have an instantly recognizable appearance, with their broad, double-tail that fans out like an open umbrella. Their bodies are short, compact, and plump, creating a round and smooth silhouette. The tail is one of their most distinctive features, often very large in comparison to their body size, with elegant, flowing fins. Fantails come in a variety of colors, including orange, red, white, black, or a combination of these hues. Their scales are shiny and reflective, adding to their visual appeal. The fins, including the tail, are long and graceful, often undulating in the water, adding to their aesthetic beauty.

Behavior and Temperament
Fantail goldfish are generally peaceful, easygoing fish that thrive in the company of other non-aggressive species. Their calm temperament makes them a popular choice for community tanks. These goldfish enjoy the company of others, and it’s generally recommended to keep them in pairs or small groups. However, they may become stressed if kept with overly aggressive or fast-swimming tankmates.
Fantails are social fish, and they often display curious behaviors, exploring their tank and interacting with their environment. They are not shy and can be observed swimming leisurely in the aquarium, often near the surface. While they may not be as active as some other species, they are often seen “basking” in the water, enjoying the calm and soothing environment.
Compatible Tankmates
Fantail goldfish are peaceful fish that do well in community tanks with other non-aggressive species. They should be kept with fish that are similarly sized and have a calm demeanor, as their slow-moving nature makes them vulnerable to being outcompeted for food by faster swimmers. It’s best to avoid aggressive or fin-nipping species, as this can cause stress or injury. Additionally, tankmates with similar water requirements, such as other goldfish species or slow-moving species like certain types of tetras and loaches, will thrive together with a fantail goldfish.

Ideal Tankmates | Tankmates to Avoid |
✔ Other goldfish varieties (e.g., Shubunkins, Comets, Orandas) | ✖ Fast-swimming species that could outcompete them for food (e.g., Danios, Barbs) |
Ideal Living Environment
Fantail goldfish thrive in cool to moderate water temperatures and should be kept in a spacious aquarium or pond. A minimum tank size of 20 gallons is recommended for a single fish, with additional space for more fish. Fantails are not very active swimmers, so they require plenty of space to swim in leisurely circles. The water should be kept clean, with regular water changes and a high-quality filtration system to maintain optimal water quality. They prefer a neutral to slightly alkaline pH (between 7.0 and 8.4), and the temperature should be kept between 65°F and 75°F (18°C to 24°C). Although they can tolerate a range of water conditions, it’s important to avoid fluctuating water temperatures or poor water quality, as this can affect their health and lifespan.
Breeding Black Moor Goldfish
Breeding fantail goldfish in an aquarium can be an exciting process, though it may require patience and the right setup. Fantails are egg layers, and the female will scatter eggs on flat surfaces, which the male will then fertilize. To encourage breeding, it’s important to mimic seasonal changes in the water temperature, as this triggers the spawning behavior. A breeding tank with plenty of plants and substrate for egg-laying should be set up to ensure success. After fertilization, the eggs will hatch in approximately 4 to 7 days, and the baby fish, or fry, should be fed specially prepared foods until they are large enough to consume regular food. The fry should be kept in a separate tank to prevent adult fish from eating them.
Health Considerations
Water Quality: Fantail goldfish are particularly sensitive to water quality, so a good filtration system is essential. Regular water changes are also important to keep the water clean and reduce the risk of diseases.
Diet: A balanced diet of high-quality goldfish pellets, supplemented with occasional live or frozen foods like brine shrimp and daphnia, will keep your fantail healthy.
Parasites and Infections: Like other goldfish, they are prone to diseases like Ich (white spot disease) and Fin Rot. Regular water changes, quarantine of new fish, and avoiding overcrowding can help prevent outbreaks.
Swim Bladder Disorder: Fantails, due to their short bodies and rounded shape, are prone to swim bladder disorders. To reduce the risk, avoid overfeeding and ensure they have enough space to swim properly.
Stress: Fantail goldfish are sensitive to stress, which can lead to health problems. It’s essential to maintain a calm, stable environment and avoid keeping them with overly aggressive or fast-moving tankmates.
What do Fantail goldfish eat?
They are omnivores and require a varied diet of goldfish pellets, flakes, and fresh vegetables like peas or spinach. Occasional protein sources such as brine shrimp or bloodworms can enhance their health.
Are Fantail goldfish good pets?
Yes, Fantail goldfish make excellent pets because they are hardy, peaceful, and easy to care for. Their graceful swimming and unique double tail make them a beautiful addition to any aquarium.
Are Fantails good or bad luck?
In many cultures, goldfish, including Fantails, are considered symbols of good luck, prosperity, and abundance. Keeping them in a clean and well-maintained environment is believed to bring positive energy.
What are three interesting facts about Fantails?
First, Fantail goldfish have double tails, which give them a distinctive and elegant swimming style. Second, they lack a stomach, so they need frequent small meals instead of one large feeding. Third, their color can change over time due to genetics, diet, and water conditions.
Is the Fantail male or female?
Fantail goldfish can be male or female, but it can be difficult to tell them apart. Males usually develop tiny white breeding tubercles on their gill covers and pectoral fins during the breeding season, while females appear rounder when carrying eggs.