Ranchu Goldfish – The Complete Info Guide

Ranchu Goldfish - The Complete Info Guide

Last Updated on January 11, 2024 by Fumipets

All About Ranchu Goldfish: The Fascinating World of Fancy Fish


Ranchu Goldfish, known for their unique appearance and captivating charm, have become a beloved variety among fish enthusiasts. These fancy goldfish are treasured for their distinctive round bodies, lack of a dorsal fin, and vibrant colors. Originating in Asia, particularly Japan, Ranchu Goldfish have a rich history and have captured the hearts of aquarists worldwide.

In this article, we’ll dive into the captivating world of Ranchu Goldfish, exploring their origins, care requirements, and what makes them a favorite choice for aquarium enthusiasts.

Ranchu Goldfish

Ranchu Goldfish have an interesting appearance and are available in a range of colors, forms, and sizes. Under the right care settings, they have the ability to grow enormous and live a long life. Ranchus are a wonderful complement to beautiful, slow-moving goldfish tanks that are properly stocked, styled, and equipped with the requisite aerator and filter. We will go through the criteria for taking care of this kind of goldfish below, along with the knowledge that is required.

Quick Facts about Ranchu Goldfish:

Species Name: Carrassius auratus
Family: Minnows and Carps
Care Level: Moderately difficult
Temperature: 65°-77°Fahrenheit
Temperament: Social and peaceful goldfish who will benefit greatly from a compatible tankmate
Color Form: Red, calico, combinations of red and white or gold and white
Lifespan: Approximately 10-15 years
Size: 5”-8”
Diet: Omnivorous, both vegetables and protein are Disadvantagesumed in order to obtain overall health.
Minimum Tank Size: 10 gallons for one full-grown adult Ranchu and an additional 5 gallons per tankmate
Tank Set-Up: safe and smooth decorations to avoid unnecessary injury but enough to add security within the tank
Compatibility: Suitable with most slow-moving, fancy goldfish, not ideal with other species of fish or fast-moving, slim-bodied goldfish

Ranchu Goldfish Overview

The lack of a dorsal fin and the development of a wen, a large head growth, serve as unusual and distinctive characteristics that help identify these goldfish. This makes it harder for individuals to regulate their bodies when swimming, slowing them down and even necessitating rest breaks throughout the day to replenish their energy.

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Despite being one of the most tranquil goldfish, they are restricted by their morphology. Due to their excessively stocky and rounded body forms, they are more prone to swim bladder conditions than the majority of other slim-bodied goldfish.

They are not the conventional goldfish seen in most pet shops, and they are normally purchased from an established breeder that uses superior genetic stock for body type and overall health. In an adequately furnished and filled tank, they need at least one suitable tankmate to flourish and feel more sociable and comfortable.

Due to the Ranchu’s more sensitive nature and physique, more care is suggested. If maintained in an empty, unfiltered, and understocked tank, they may grow anxious. To prevent swim bladder condition and other health problems associated with it, these fish need a properly thought-out diet.

What’s the price of Ranchu Goldfish?

The cost of non-competing fish, on the other hand, ranges from $5 to $25 and depends on availability, age, size, and source. Due to the significant shipping expenses associated with transporting live animals, purchasing from a pet shop will often be less expensive.

Normal Conduct & Temperament

These calm fish naturally move slowly and are gregarious. They often may be observed searching the substrate for any food scraps left over from the previous day. They could also be seen floating in the water or resting at the bottom of the tank for a little rest. They have a natural curiosity for exploring and learning about their environment. You’ll observe them swimming in an appealing manner, squirming about the tank and seeming anxious to explore.

Varieties and Aesthetics

Come in a range of colors, each with its own pattern and shade of metallic scales. Remember that throughout the course of their lifespan, their colors may alter or fade. Although they may be many different colors, they are often bi-colored, with red and white as well as gold and white being the most popular combinations.

They produce a raspberry-shaped wen on top of their heads, as previously described, so do not be worried if you see one growing. In certain cases, it may even obscure their sight, which makes them less agile.

Care Instructions for Ranchu Goldfish

Habitat, tank setup, and conditions

• Tank/Aquarium Size: For a fully developed Ranchu, a minimum tank size of 10 gallons is needed, and an extra 5 gallons should be added for each tankmate. Remember that tank size might vary significantly based on the size of the goldfish and the number you want to put in the aquarium.

• Water Temperature and pH: Although it’s not ideal, goldfish can tolerate a wide range of water temperatures since they are temperate water fish. Goldfish like temperatures between 65 and 77 degrees Fahrenheit. They need a constant pH of 7. 2 to 7. 6.

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• Substrate: For your tank, sand or gravel of the proper size should be utilized. As Ranchus prefer to forage for food, make sure the gravel is big enough so that they won’t choke on it. To add enrichment, it is crucial to provide a secure substrate. Long-term, bare bottom tanks are not recommended.

• Plants: Give your aquarium color and diversity. They are advantageous in maintaining healthy water quality and enhancing fish diets. If you want to prevent ranchus from selecting soft edible plants, use plants with thick leaves that are difficult for animals to eat.

• Lighting: If the location of your aquarium doesn’t get enough natural light, you may want to consider purchasing an aquarium light. Make sure Ranchu Goldfish get 8–12 hours of darkness to relax since they need a day–night cycle.

• Filtration: To keep the water in the tank clean, a filter of the proper size must be included. In accordance with the bioload and conditions, make sure it can filter a few extra gallons in addition to the tank’s capacity.

Do Ranchu Goldfish Make Good Tank Companions?

Most fish, particularly several varieties of fast-moving goldfish, are not the best tankmates for ranchus. They struggle to move about since their body types are severely impaired. They may not be able to locate food before the other fish because their wen may grow over their eyes and impair vision, which can result in stress and hunger.

Due to bullying, fin nipping, or resource rivalry inside the tank, they do not make suitable community fish and should not be paired with other fish species or quick, slim-bodied goldfish. With slow-moving, similar-sized goldfish, they get along and thrive because they are not forced to compete for food or run the danger of fin nipping.

How Much to Feed a Ranchu Goldfish

In order to maintain good health, ranchus need a balanced diet. Because they run the danger of developing swim bladder disorders, eating foods that float should be avoided to prevent them from consuming extra air at the surface.

To support the maintenance of a healthy digestive system and bodily function, good quality flakes, sinking pellets, or gel food should be offered together with appropriate vegetables.

Inappropriate feeding, nutrition, and/or portion sizes cause a lot of goldfish deaths, which are readily avoidable with the right instruction.

We advise the best-selling book The Truth About Goldfish since it covers all aspects of goldfish feeding, tank upkeep, diseases, and more. Check it out right now on Amazon.

To prevent contaminating the water and having decaying food in the tank, which can result in an ammonia rise, be sure to remove any uneaten food. Avoid overfeeding your Ranchu, but make sure each fish receives enough food. Limit the amount of food they are given to what they can consume in two minutes.

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Maintaining Your Ranch’s Health

By ensuring that your Ranchu enjoys adequate water conditions, you can keep them content and healthy. This necessitates maintaining the tank cycled, operating a decent filter, and having enough aeration. When required, just do partial water changes.

In order to raise and maintain a healthy fish, it is crucial to provide it with a high-quality, portioned meal. To prevent stress, keep them away from jarring tank movements, loud noises, and other disruptive sounds. Make sure your Ranchu is properly housed under ideal circumstances with serene and friendly tankmates. A healthy and happy Ranchu is one who is not stressed out. To achieve this, proper attention must be taken.


Ranchu breed in the wild in the springtime, when the weather is ideal and suitable partners are available. When maintained healthy, goldfish will spawn in warmer water temperatures between the ages of 1-2 when they should be ready to procreate.

The males will exhibit breeding stars to indicate that they are ready to mate. You will also see the males pursuing the females, which is a sign of goldfish breeding behavior.

Make sure the males’ actions are not causing the females to feel harassed and pursued constantly. It’s advisable to use a tank divider to separate the genders if this occurs. Make sure your tank has adequate visible barriers and suitable hiding places before breeding season and age arrive to prevent the disadvantageous stress of mating behaviors.

How Well Do Ranchu Goldfish Fit In Your Aquarium?

A Ranchu will blend in perfectly if you maintain a tank with the proper size and stocking rate and possess or want to own a variety of slow-moving, round-bodied goldfish. The joy of having a Ranchu Goldfish, that will give color and cuteness to the right tank, will be yours as long as you maintain an adequate filtration and aeration system, offer smooth decorations, and feed a diverse and nutritious food.

You are prepared to purchase your Ranchu Goldfish and maintain a healthy aquarium if you have checked off all the aforementioned care requirements. The most crucial factors are smooth decorations, appropriate tank mates, and openings large enough for your Ranchu to swim through.

Q&A: Exploring the World of Ranchu Goldfish


What are Ranchu Goldfish, and where do they come from?

Ranchu Goldfish, scientifically known as Carassius auratus, are a unique variety of fancy goldfish renowned for their distinctive features. They originated in Asia, particularly Japan and China, with Japan being the primary source of the breed’s development.


What sets Ranchu Goldfish apart from other goldfish varieties?

Ranchu Goldfish are easily distinguished by their lack of a dorsal fin and their round, egg-shaped bodies. Their bodies have a smooth curvature, resembling a small, swimming football. These distinctive features set them apart from common goldfish varieties.


What colors and patterns are commonly found in Ranchu Goldfish?

Ranchu Goldfish exhibit a wide range of colors and patterns, making them highly sought after by collectors. Common colors include red, white, orange, black, and combinations of these. Their scales may display metallic, matte, or calico patterns, adding to their visual appeal.


What is the ideal habitat and care for Ranchu Goldfish?

Creating a suitable habitat for Ranchu Goldfish is crucial to their well-being. They thrive in spacious aquariums with excellent filtration systems to maintain water quality. The water temperature should be kept between 68°F to 72°F (20°C to 22°C), and they require adequate aeration. Additionally, a soft substrate and regular water changes are essential for their health.


Are Ranchu Goldfish suitable for beginners in the world of fishkeeping?

While Ranchu Goldfish are captivating and visually stunning, they may not be the best choice for beginners. Their unique features require specific care, and maintaining water quality can be challenging. It’s recommended that novice aquarists gain experience with hardier fish varieties before considering Ranchu Goldfish as pets.

Ranchu Goldfish, with their intriguing appearance and unique characteristics, continue to be a source of fascination for fish enthusiasts. Their captivating presence in aquariums offers a glimpse into the world of fancy fishkeeping, where aesthetics and care go hand in hand.





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