CATEGORY: Goldfish

Choosing your first goldfish may seem simple until you discover that there are dozens of different varieties. From sleek, fast-swimming Comets to elegant Orandas with flowing fins and head growths, goldfish come in an incredible range of shapes, sizes, and colors.

The biggest decision most new owners face is whether to keep common goldfish or fancy goldfish. Although both belong to the same species (Carassius auratus), selective breeding has created two groups with noticeably different appearances, personalities, care requirements, and ideal living conditions.

This guide compares common and fancy goldfish in detail so you can decide which type best suits your aquarium, experience level, and lifestyle.

—

Understanding Goldfish Varieties

Goldfish have been selectively bred for over a thousand years, resulting in hundreds of recognized varieties.

Almost every goldfish belongs to one of two broad categories:

• Common (single-tailed) goldfish
• Fancy (double-tailed) goldfish
  

While they share similar nutritional and water quality needs, their body shapes dramatically influence how they swim, grow, and interact with their environment.

—

Common Goldfish

Common goldfish closely resemble their wild carp ancestors.

Characteristics include:

• Long streamlined body
• Single tail
• Powerful swimmer
• Highly active
• Extremely hardy
• Fast-growing
  

They are often seen in outdoor ponds but can also thrive in very large indoor aquariums.

—

Popular Common Goldfish Varieties

Common Goldfish

The classic orange goldfish found in many aquariums.

Colors include:

• Orange
• White
• Yellow
• Red
• Mixed patterns
  

—

Comet Goldfish

Comets have:

• Longer flowing tails
• Slim body
• Exceptional swimming speed
• Strong appetite
  

They require substantial swimming space.

—

Shubunkin

Shubunkins are prized for their beautiful calico coloration.

Their bodies feature:

• Blue
• Orange
• Black
• White
• Red
  

Each fish displays a unique pattern.

—

Advantages of Common Goldfish

Common goldfish are:

• More disease resistant
• Strong swimmers
• Less delicate
• Better suited to beginners
• Easier to care for
• Excellent pond fish
  

Their streamlined shape allows them to outcompete slower fish for food.

—

Disadvantages of Common Goldfish

Potential drawbacks include:

• Grow very large
• Need huge aquariums
• Produce lots of waste
• Can outgrow small tanks quickly
• Unsuitable for decorative bowls
  

Many common goldfish eventually exceed 30 cm (12 inches).

—

Fancy Goldfish

Fancy goldfish have been selectively bred for distinctive features.

These may include:

• Double tails
• Rounded bodies
• Flowing fins
• Head growths
• Bulging eyes
• Unique scales
  

They are among the most beautiful ornamental fish available.

—

Popular Fancy Goldfish

Oranda

One of the world’s favorite goldfish.

Features:

• Rounded body
• Flowing tail
• Characteristic head growth (wen)
  

Available in numerous colors.

—

Fantail

Fantails possess:

• Elegant double tails
• Compact body
• Graceful swimming style
  

They are often recommended for beginners interested in fancy goldfish.

—

Ryukin

Known for:

• High shoulder hump
• Deep body
• Long fins
• Bright coloration
  

—

Ranchu

Often called the “King of Goldfish.”

Characteristics:

• No dorsal fin
• Rounded body
• Smooth curved back
• Distinctive appearance
  

Highly valued among enthusiasts.

—

Black Moor

Easily recognized by:

• Velvet-black color
• Telescope eyes
• Long fins
  

They have limited vision and require thoughtful aquarium companions.

—

Telescope Goldfish

Available in several colors.

Known for:

• Large protruding eyes
• Slow swimming
• Delicate appearance
  

—

Pearlscale

One of the most unusual varieties.

Features include:

• Round body
• Raised pearl-like scales
• Decorative appearance
  

—

Advantages of Fancy Goldfish

Fancy goldfish offer:

• Incredible beauty
• Wide variety of colors
• Calm swimming behavior
• Ideal indoor display fish
• Excellent personalities
  

Many owners appreciate their gentle, curious nature.

—

Disadvantages of Fancy Goldfish

Selective breeding also introduces challenges.

Fancy goldfish may experience:

• Slower swimming
• Reduced vision
• Greater sensitivity to poor water quality
• Increased risk of swim bladder issues
• More delicate fins
  

They require more careful aquarium planning.

—

Size Comparison

Common Goldfish

Typical adult size:

• 25–35 cm
• Sometimes over 40 cm in ponds
  

Weight can exceed one kilogram in ideal conditions.

—

Fancy Goldfish

Typical adult size:

• 15–25 cm
  

Although shorter, their rounded bodies can appear much larger.

—

Swimming Ability

Common goldfish are powerful swimmers.

They enjoy:

• Long stretches
• Strong water currents
• Active exploration
  

Fancy goldfish swim more slowly due to:

• Rounded bodies
• Large fins
• Double tails
  

Strong filter currents may tire them.

—

Aquarium Size

Common Goldfish

Minimum recommendations:

• One fish: 110–150 liters
• Larger groups require substantially bigger aquariums
  

Outdoor ponds are often preferable.

—

Fancy Goldfish

Generally require:

• First fish: 75 liters
• Each additional fish: 40 liters
  

Larger tanks always provide greater stability.

—

Lifespan

With excellent care:

Common goldfish:

• 15–25 years
• Occasionally longer
  

Fancy goldfish:

• 10–20 years
  

Proper nutrition and water quality are the biggest factors affecting longevity.

—

Feeding Differences

Both groups enjoy similar diets.

Recommended foods include:

• Premium sinking pellets
• Gel food
• Vegetables
• Frozen foods
• Occasional live treats
  

Fancy goldfish often benefit from sinking foods to reduce air swallowing.

—

Water Quality Requirements

Both types require:

• Zero ammonia
• Zero nitrite
• Low nitrate
• Strong biological filtration
  

However, fancy goldfish are generally less tolerant of poor conditions.

—

Disease Susceptibility

Common goldfish:

Usually resistant to disease when maintained correctly.

Fancy goldfish:

More likely to experience:

• Swim bladder disorders
• Eye injuries
• Wen infections (Orandas)
• Fin damage
  

Regular observation is especially important.

—

Can They Live Together?

Technically, yes.

However, it is not ideal.

Common goldfish:

• Swim faster
• Eat quicker
• May outcompete fancy varieties
  

Fancy goldfish often struggle to obtain enough food.

For the best results:

• Keep common goldfish with other commons.
• Keep fancy goldfish with other fancies.
  

—

Pond Suitability

Common goldfish excel in ponds.

Advantages include:

• Excellent swimming ability
• Cold tolerance
• Fast growth
• Natural breeding
  

Fancy goldfish are usually better suited to indoor aquariums, although some hardy varieties can adapt to carefully managed ponds.

—

Personality Comparison

Common goldfish tend to be:

• Energetic
• Curious
• Constantly active
  

Fancy goldfish are often:

• Calm
• Gentle
• Graceful
• Interactive with owners
  

Neither personality is better—it simply depends on your preference.

—

Cost Comparison

Generally:

Common goldfish:

• Lower purchase price
  

Fancy goldfish:

• Higher prices depending on rarity
  

Rare show-quality Ranchus, Orandas, and imported Japanese varieties can command significantly higher prices than standard pet-store goldfish.

—

Maintenance Differences

Common goldfish require:

• Larger aquariums
• Strong filtration
• Plenty of swimming space
  

Fancy goldfish require:

• Gentle décor
• Careful feeding
• Reduced water flow
• Close health monitoring
  

Both require weekly maintenance and regular water changes.

—

Which Is Better for Beginners?

For complete beginners with enough space:

Common goldfish are often the easier choice due to their hardiness.

For hobbyists wanting an elegant display aquarium:

Fancy goldfish provide unmatched beauty and variety, provided their specialized needs are met.

The most important factor is not experience alone but the willingness to provide an appropriately sized aquarium and maintain excellent water quality.

—

Choosing the Right Goldfish for Your Home

Ask yourself:

• Do you have room for a large aquarium or pond?
• Do you prefer active swimmers or graceful ornamental fish?
• Are you prepared for long-term care lasting decades?
• Can you maintain consistent water quality?
  

Answering these questions honestly will help determine which group best fits your lifestyle.

—

Final Thoughts

Both common and fancy goldfish make rewarding pets when their needs are properly understood. Common goldfish impress with their strength, intelligence, and longevity, while fancy goldfish captivate with their extraordinary shapes, colors, and personalities.

Neither type is inherently better—the right choice depends on the space you can provide, the style of aquarium you want to create, and the level of care you are prepared to offer. By selecting the variety that matches your environment and committing to responsible husbandry, you can enjoy the companionship of healthy, vibrant goldfish for many years.

The End,

PawBearing