All Goldfish Species – The Complete Guide To Every Variety, Care

Do you remember your first goldfish? For many of us at Aquifarm, it was a simple “feeder” fish won at a carnival or a bright orange Common Goldfish from a local shop. You likely agree that these fish are the quintessential “gateway” to the aquarium hobby, but there is so much more to them than meets the eye.

I promise that once you understand the incredible diversity and personality found within all goldfish species, you will never look at them as “disposable” pets again. These are intelligent, long-lived, and visually stunning creatures that deserve a specialized approach to their care.

In this comprehensive guide, we are going to preview the two main categories of goldfish, dive deep into the specific traits of the most popular varieties, and provide the expert-level care tips you need to keep your aquatic friends healthy for years to come. Let’s dive in!

Understanding the Two Main Categories of all goldfish species

Before we look at individual types, it is important to understand that all goldfish species (Carassius auratus) are descendants of the wild Prussian Carp. Through centuries of selective breeding, they have branched into two distinct physical categories: Slim-Bodied and Fancy goldfish.

The Slim-Bodied Goldfish (Single-Tail)

These varieties most closely resemble their wild ancestors. They have long, streamlined bodies and a single tail fin. They are incredibly hardy, fast swimmers, and are often better suited for outdoor ponds or very large aquariums because of their size and activity levels.

The Fancy Goldfish (Double-Tail)

Fancy goldfish are the result of intense selective breeding for specific aesthetic traits. They generally have egg-shaped bodies and paired (double) caudal and anal fins. Because of their compact anatomy, they are slower swimmers and require more controlled environments than their slim-bodied cousins.

Popular Slim-Bodied Goldfish Varieties

If you are looking for a fish that is tough as nails and full of energy, the slim-bodied varieties are for you. Don’t let their “simple” look fool you; their metallic scales and graceful movements are captivating in a large setup.

The Common Goldfish

The Common Goldfish is the original variety. They are usually orange, red, or yellow, but they can also be found in white or bronze. They are exceptionally hardy and can grow up to 12 inches long, meaning they quickly outgrow small tanks.

The Comet Goldfish

Often confused with the Common, the Comet is distinguished by its long, deeply forked tail. They are even more active than Commons and are famous for their “racing” behavior across the tank. They are the perfect choice for a large, filtered pond.

The Shubunkin Goldfish

Shubunkins are my personal favorite among the single-tails. They feature a “calico” pattern—a mix of blue, red, orange, and black spots. Their nacreous scales give them a pearly sheen that looks incredible under high-quality aquarium lighting.

The World of Fancy Goldfish: Beauty and Grace

Fancy goldfish are like the “living art” of the aquarium world. When exploring all goldfish species, the fancies are where you find the most unique head growths, eye shapes, and finnage. However, their unique shapes mean they need a bit of extra “TLC.”

The Fantail Goldfish

The Fantail is the best “beginner” fancy goldfish. They have a classic egg-shaped body and a beautiful split tail. They are much hardier than other fancy varieties, making them a great starting point for those new to the hobby.

The Oranda Goldfish

Orandas are famous for the “wen”—a fleshy growth on the top of their heads. As the fish matures, the wen becomes more prominent. Pro tip: Keep your water pristine, as the folds of the wen can sometimes trap debris or bacteria!

The Ryukin Goldfish

Recognizable by the massive hump behind their head, Ryukins have a very tall, pointed appearance. They are surprisingly feisty for fancy goldfish and are often the “boss” of a community tank. Their pointed fins give them a very regal silhouette.

The Ranchu and Lionhead

These varieties are unique because they lack a dorsal (top) fin. The Ranchu has a more curved back, while the Lionhead is slightly flatter. Both feature impressive head growths. Because they lack a dorsal fin, they are slower swimmers and should not be kept with faster, competitive fish.

The Pearlscale Goldfish

These fish look like little golf balls! Their scales have a raised, calcium-rich center that looks like a pearl. While they are absolutely adorable, their round shape makes them prone to swim bladder issues, so a high-fiber diet is essential.

The Exotic Wonders: Telescopes, Celestials, and Bubble Eyes

For the intermediate keeper, these specialized all goldfish species offer a look that is truly out of this world. These fish have physical mutations that require specific aquarium modifications to keep them safe.

The Telescope Eye Goldfish

These fish have large, protruding eyes that stick out from the sides of their head. The Black Moor is the most famous version of this type. Because their eyes are delicate, you must avoid any sharp decorations or plastic plants in their tank.

The Celestial Eye Goldfish

Similar to the Telescope, but their eyes are permanently locked in an upward-looking position. Legend says they were bred to watch the heavens. They have very poor vision when it comes to finding food on the bottom, so hand-feeding or using a feeding ring is often necessary.

The Bubble Eye Goldfish

These are perhaps the most fragile of all. They have large, fluid-filled sacs under their eyes. If these sacs pop, they can become infected. Soft sand and smooth rocks are the only acceptable substrates for these delicate beauties.

Essential Care Requirements for all goldfish species

Keeping goldfish successfully isn’t just about picking the prettiest one; it’s about creating an environment where they can thrive. Many beginners make the mistake of thinking goldfish are “low maintenance,” but they actually require robust filtration and consistent water changes.

Tank Size and Water Volume

Forget the bowl! Goldfish produce a significant amount of waste (ammonia). For fancy goldfish, I recommend a minimum of 20-30 gallons for the first fish, with an additional 10 gallons for each friend. For slim-bodied varieties, a 55-gallon tank or a pond is the bare minimum.

Filtration: Over-Filter is the Rule

Goldfish are “messy” eaters and produce a high bioload. You should aim for a filter that is rated for twice the size of your actual tank. A high-quality canister filter or a powerful HOB (Hang-On-Back) filter with plenty of biological media is your best defense against poor water quality.

Temperature and Water Parameters

While often called “cold-water fish,” goldfish actually prefer stable, temperate water.

• Temperature: 68°F to 74°F (20°C to 23°C) is the “sweet spot” for most varieties.
• pH: They prefer slightly alkaline water, between 7.0 and 8.0.
• Ammonia/Nitrite: Must always be 0 ppm.
• Nitrate: Keep below 20 ppm through weekly water changes.

Diet and Nutrition: Keeping Your Goldfish Healthy

Feeding is the highlight of the day for any goldfish keeper, but quality matters. Goldfish are omnivores and need a balance of protein and vegetable matter to prevent digestive issues.

The Dangers of Floating Flakes

I always recommend sinking pellets over floating flakes. When fancy goldfish gulp air at the surface to eat flakes, they often develop “buoyancy issues.” Sinking pellets allow them to forage naturally on the substrate without swallowing excess air.

Vegetables and Foraging

Goldfish love their greens! Providing blanched spinach, zucchini, or shelled peas once or twice a week is excellent for their digestion. Peas, in particular, act as a natural laxative and can help clear out swim bladder obstructions in rounder fish like Pearlscales and Ryukins.

Aquascaping for Goldfish: Beauty Meets Safety

Designing a tank for all goldfish species requires a balance of aesthetics and practicality. Goldfish love to sift through the bottom of the tank looking for food, so your choice of substrate is vital.

Substrate Choice

Fine aquarium sand is the gold standard. Goldfish will take mouthfuls of sand, sift out the microorganisms, and spit the sand back out. Large gravel can be dangerous, as a curious fish might get a pebble stuck in its mouth, leading to stress or injury.

Live Plants

Goldfish are notorious for eating plants, but you can still have a green tank! Stick with epiphytes like Anubias or Java Fern. These have tough, bitter leaves that goldfish generally leave alone. You can also use floating plants like Frogbit, but be prepared for the goldfish to snack on the roots!

Common Health Issues and Prevention

Even with the best care, goldfish can occasionally get sick. Being an observant aquarist is the best way to catch problems early. Look for changes in swimming behavior, clamped fins, or spots on the skin.

Swim Bladder Disorder

This is common in fancy varieties. The fish may float to the top or sink to the bottom, unable to stay upright. This is often caused by constipation or poor diet. Fasting the fish for 24 hours and then feeding deshelled peas usually fixes the problem.

Ich (White Spot Disease)

If your fish looks like it has been sprinkled with salt, it likely has Ich. This parasite is often triggered by temperature fluctuations or stress. Raising the temperature slightly and using a copper-based medication or aquarium salt can effectively treat this.

Frequently Asked Questions about Goldfish

How long do goldfish actually live?

With proper care, fancy goldfish can live 10 to 15 years, while slim-bodied varieties like Commons and Comets can live 20 years or more! The oldest recorded goldfish lived to be 43.

Can I keep goldfish with tropical fish?

Generally, no. Goldfish prefer cooler water and produce more waste than most tropical fish can handle. Additionally, goldfish will eat anything that fits in their mouth, meaning your small tetras or shrimp might become an expensive snack.

Do goldfish really only have a 3-second memory?

That is a complete myth! Studies have shown that goldfish have a memory span of at least three to five months. They can even be trained to recognize their owners and perform simple tricks for food.

How many goldfish can I put in a 20-gallon tank?

In a 20-gallon tank, you should only keep one fancy goldfish. While it might look empty at first, that fish will grow rapidly. Overcrowding leads to stunted growth and “nitrate creep,” which can be fatal.

Conclusion: Finding Your Perfect Goldfish

Exploring all goldfish species reveals a hobby filled with color, personality, and history. Whether you choose the lightning-fast Comet for a backyard pond or a waddling, “golf ball” Pearlscale for your living room, you are bringing home a companion that will recognize you and interact with you daily.

Don’t worry—this setup might seem like a lot of work at first, but once you establish a routine of weekly water changes and high-quality feeding, your goldfish will reward you with years of beauty. Remember, the key to success is giving them the space they need to grow and the clean water they need to breathe.

We hope this guide helps you feel confident in starting your goldfish journey. For more specific advice on filtration and plant selection, be sure to check out our other resources here at Aquifarm. Happy fish keeping!