Izumo Nankin Goldfish (Care Guide)

traditional japanese goldfish breed

The Izumo Nankin Goldfish is a Japanese breed known for its round body, prominent dorsal hump, and flowing fins. It is rare and requires careful maintenance, which aquarists both admire and find challenging.

This discussion focuses on how to keep the Izumo Nankin Goldfish healthy and maintain its lineage. We will examine aquarium setup, diet, and breeding methods, and consider how to ensure the breed’s survival for the future.

General Species Profile

The Izumo Nankin Goldfish is a good size for beginners and advanced aquarium enthusiasts to maintain. It has a stout body and large eyes, adding to its decorative quality. This goldfish can live for over ten years with proper care.


The Izumo Nankin goldfish is known for its round body and a noticeable dorsal hump. They have bright colors, mainly red and white, and a shape similar to ryukin goldfish without a dorsal fin.

Their distinctive features include large eyes and short fins. They grow to 6-8 inches in length, making them suitable for decorative fish tanks.

They are valued for their beauty and calm nature by goldfish enthusiasts and collectors.


Nankin goldfish can live up to 10-15 years with proper care and a good environment. They originated from Shimane Prefecture in Japan and are known for their longevity. The Izumo Nankin goldfish have historical and cultural value, and efforts are made to preserve this breed through responsible care and conservation.

A large, clean aquarium with stable, filtered water at 65-75°F is essential for their well-being. Regular water changes, effective filtration, and high-quality food are necessary for their health.


The Izumo Nankin goldfish have a lifespan that is longer than average and typically grow to be 6-8 inches long. They have a unique body shape with a small head, making them a good choice for those who want a medium-sized fish.

These goldfish are active swimmers and do well in large aquariums. They can also live comfortably in a 30-gallon tank, which makes them easier to care for in terms of tank maintenance and water quality.

It’s important to choose their tankmates wisely to prevent them from being bullied by bigger or more aggressive fish.

Aquarium Configuration Essentials

To properly care for Izumo Nankin Goldfish, there are several important considerations.

Firstly, the aquarium size should be large enough to accommodate their growth. Goldfish can grow quite large, so it’s important to provide them with enough space to swim and thrive.

Secondly, the tank equipment must be carefully chosen and maintained to ensure a clean and stable environment. This includes a reliable filtration system to remove waste and maintain water quality, as well as a heater to keep the water temperature within the appropriate range. Regular water testing and partial water changes are also necessary to keep the water parameters in check.

Lastly, it is beneficial to include decorations in the tank that replicate their natural habitat. This can include live or artificial plants, rocks, and hiding places. These decorations not only provide a more visually pleasing environment, but also create hiding spots and areas for exploration, which can contribute to the well-being of the goldfish.

Tank Size

A 30-gallon tank is the minimum requirement for Izumo Nankin Goldfish to accommodate their activity and health. These goldfish, from Shimane Prefecture, need space for natural behavior and stress reduction.

A 40-50 gallon tank is recommended for better swimming space and to include plants and substrate similar to their natural environment. The aquarium must have effective filtration and aeration.

Regular checks of water temperature, pH, and ammonia levels are essential for maintaining conditions suitable for Izumo Nankin Goldfish.

Tank Equipment And Decorations

To create a suitable environment for Izumo Nankin Goldfish, select tank equipment and decorations that cater to their needs. This breed, registered in Shimane, Japan, requires an aquarium that highlights their features and maintains their health.

  • Choose an aquarium that holds at least 30 gallons to allow for swimming and growth.
  • Install an efficient filtration system to maintain clean water.
  • Add live or artificial plants for enrichment and a suitable substrate to encourage natural behaviors.
  • Use lighting that promotes plant growth, fish health, and enhances the fish’s colors.
  • Regularly test the water for pH and temperature to ensure optimal conditions.

It is essential to equip the aquarium properly for the well-being of Izumo Nankin Goldfish in Japan.

Optimal Care Practices

To maintain the health of Izumo Nankin goldfish, it is important to focus on their diet, water quality, and regular tank cleaning.

Proper care reduces disease risk and ensures a healthy habitat for this specific type of goldfish.

Following these guidelines helps preserve the species.


A balanced diet is crucial for the health of Izumo Nankin goldfish, which require a mix of foods due to their omnivorous nature. These goldfish originate from Shimane Prefecture, Japan, and are a registered breed that is often hard to find, hence their diet is vital for their survival.

The ideal diet should include:

Quality fish food:

  • Use goldfish-specific pellets or flakes.
  • Choose food appropriate for the Nankin’s size and dietary needs.

Variety in food sources:

  • Add live or frozen foods like bloodworms and brine shrimp.
  • Incorporate vegetables such as peas and zucchini for fiber.

Monitor their feeding closely to ensure their diet is appropriate and to keep them healthy. Avoid overfeeding to prevent health problems.

Water Parameters

Water Parameters are crucial for the health of Izumo Nankin goldfish from Shimane Prefecture. These registered and rare fish require constant monitoring of their water environment. Below is a table with the necessary water quality parameters:

ParameterOptimal Range
Temperature65-75°F (18-24°C)
pH Level6.5-8.0
Water HardnessSoft to Medium

Regular water changes and proper filtration are important to maintain these parameters for the well-being of Izumo Nankin goldfish.

Tank Maintenance

Having discussed the essential water parameters for Izumo Nankin goldfish, we now turn our attention to the regular tank maintenance practices that are pivotal for sustaining a healthy aquatic habitat.

Regular water changes are indispensable, helping to mitigate the buildup of waste and toxins, a concern for every responsible hobbyist, including members of the Central Nankin Lovers community.

Utilizing a robust filtration system is also imperative to maintain water clarity and hygiene, essential for this registered breed from Shimane Prefecture.

Temperature regulation within 65-75°F is critical, catering to the thermal comfort of these Japanese Goldfish.

A balanced, high-quality diet fortifies their health, while a capacious tank provides the necessary space for these elegant swimmers to exhibit their full grace and vitality.

Common Diseases

Enthusiasts of Izumo Nankin goldfish should be alert to diseases that can affect their fish. They need to maintain high care standards to prevent and manage these diseases. Common causes of diseases include stress, poor water quality, and new fish introducing pathogens.

To protect their goldfish:

  • For Ich (Ichthyophthirius multifiliis): Keep water quality high and quarantine new fish.
  • For Swim Bladder Disorder: Provide a varied diet and control feeding to avoid overfeeding.

Goldfish are resilient but still susceptible to illness. Owners should regularly check their fish and act quickly if they notice symptoms of disease. Consulting a certified aquatic veterinarian is recommended for accurate diagnosis and treatment of severe diseases.

Personality Traits

The Nankin goldfish is known for its calm and friendly nature, making it popular with fish enthusiasts. Originally from Japan, particularly the southwestern Shimane Prefecture, it is valued for its peaceful behavior. Its temperament is suitable for both new and experienced fish keepers as it tends to be less aggressive than other types of ornamental fish.

Finding Nankin goldfish outside of Japan is challenging due to their rarity in the international market. This scarcity is because of their historical importance and conservation efforts in Japan aimed at protecting the breed’s unique qualities and heritage.

Nankin goldfish typically grow to 6-8 inches and are adaptable to various aquarium environments. They have a distinctive body shape with a hump on their back and come in colors like red, white, yellow, and black, which make them visually appealing.

Efforts by conservationists and breeders are in place to preserve the Nankin goldfish’s genetic diversity, ensuring its survival for future enjoyment.

Compatible Tank Companions

Choosing the right tank mates for Izumo Nankin Goldfish is important for a stable aquarium and the health of the fish. These red and white goldfish from Japan are calm and do well with other non-aggressive fish. When picking other species, it’s important to look at their behavior, size, and needs to avoid stress and fights.

Here are some appropriate tank mates for Izumo Nankin Goldfish:

  • White Cloud Mountain Minnows: These are small and peaceful, providing activity without bothering the goldfish.
  • Ranchu Goldfish: They have similar care needs and live well with Izumo Nankin, not fighting over food or space.
  • Oranda and Ryukin Goldfish: They also have similar requirements, making them good tank mates.
  • Nerite Snails: They eat algae, helping to keep the tank clean, and don’t disturb the goldfish.
  • Mystery Snails: They are also harmless and help maintain the tank’s environment.
  • Cherry Shrimp: They live well with Izumo Nankin Goldfish in a planted tank, as long as the goldfish aren’t hungry and don’t chase them.
  • Corydoras Catfish: These catfish are peaceful and clean up food leftovers without bothering the goldfish.
  • Bristlenose Plecos: They eat algae and are peaceful, living without issues with the goldfish.

Reproduction Techniques

Controlled spawning is used to reproduce Izumo Nankin Goldfish, a variety descended from Marco, the Ranchu ancestor. This process takes place in a breeding tank to protect the eggs and fry.

To start, mature Izumo Nankin goldfish are placed in a breeding tank with cooler water to trigger spawning, simulating their natural environment. The water temperature is then gradually increased to encourage spawning.

After spawning, eggs are collected to avoid being eaten by the adult goldfish. They are moved to an incubation container with gentle aeration, and water conditions are kept stable for embryo development.

Once hatched, the fry are fed specialized food and kept in a rearing tank with proper filtration to ensure their growth and survival.

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