The Fish Guru

Breed and Raise Healthy Goldfish: Techniques Tips and FAQs

Breeding Goldfish: Techniques and Tips

Goldfish have been a popular pet for centuries due to their colorful appearance and relatively easy maintenance. However, some pet owners have taken their love for goldfish to the next level and have decided to breed them.

Breeding goldfish is not only a fun hobby, but it can also be profitable for those who wish to sell them. In this article, we will be discussing the techniques and tips for breeding goldfish.

Identifying the Right Age and Sex of Goldfish

To begin breeding goldfish, you must identify the right age and sex of your fish. Goldfish need to be mature enough to breed, which usually happens around the age of one year old.

However, some species of goldfish may mature faster or slower than others. Identifying the sex of goldfish can be a bit tricky as there are no external differences between males and females.

The only way to tell is by examining their vent area. Males will have a slightly concave vent, while females will have a rounder, more convex vent.

Setting up the Tank for Breeding

When it comes to breeding goldfish, the right tank setup is essential. You need to provide suitable breeding surfaces and create the right environment for your fish to thrive.

The ideal breeding tank should be large enough to allow the fish to swim freely and have plenty of hiding spots for eggs and fry. Breeding surfaces are critical as goldfish like to lay their eggs on flat surfaces, such as leaves or rocks.

You can create breeding surfaces by placing tiles or spawning mops in your tank. Ensure the water temperature is between 60-70F, and the water pH is between 7.0 – 8.0 to encourage breeding.

Feeding your goldfish a protein-rich diet like brine shrimp, daphnia, bloodworms, and pellets can also stimulate breeding.

Techniques for Breeding Goldfish

There are several breeding techniques you can use to successfully breed goldfish. One of the most popular methods is the “egg scatterers” technique.

Egg scatterers are goldfish that lay their eggs on breeding surfaces and do not guard them. After the eggs have been laid, egg scatterers should be removed from the breeding tank to prevent them from eating their eggs or fry.

Another technique is “bubble nesters,” where the male goldfish creates a bubble nest on the breeding surface, and the female lays the eggs inside the nest. After the eggs have been laid, the male will protect the eggs and fry until they are old enough to fend for themselves.

Identification of Goldfish Eggs

Once your goldfish have successfully bred, you need to identify the goldfish eggs. Goldfish eggs are small and clear, and they usually stick to the breeding surface where they were laid.

Over time, the eggs will start to develop an amber or brown color. To tell whether the eggs have been fertilized, you need to look for a small dot or “eye” in the center of the egg.

This dot is the embryo, and it will develop into a fry if the egg has been fertilized. If you notice that some eggs are not fertilized, they will turn white, and their color will fade.

Prevention and Treatment of Scum and Fungus Buildup

Scum and fungus are prevalent in breeding tanks and can cause harm to the eggs and fry. To prevent scum and fungus buildup, change a portion of the water daily and remove any uneaten food and debris.

Adding methylene blue to the water can help prevent fungus. If you notice that scum and fungus have already begun to build up, remove the dead eggs and fry immediately.

Increase the aeration in the tank and add methylene blue to the water.


Breeding goldfish requires adequate preparation, a suitable tank setup, and the right breeding techniques. Identifying the right age and sex of your fish is crucial, and you must provide adequate breeding surfaces and the right feeding conditions.

Once your goldfish start laying their eggs, it’s essential to know how to identify their eggs, prevent scum and fungus buildup, and give them the best possible chance to grow into healthy fry. With the tips mentioned in this article, you can start breeding goldfish successfully!

Raising Goldfish Fry and FAQs

Raising goldfish fry can be an exciting journey, but it also requires a lot of attention and careful care. When it comes to raising goldfish fry, understanding the hatching period of goldfish eggs, providing proper care for newly hatched fry, and dealing with dead fry and infertile eggs are essential.

In this article, we will discuss in detail the techniques and tips for raising goldfish fry and answer some frequently asked questions about breeding goldfish.

Hatching Period of Goldfish Eggs

The hatching period of goldfish eggs typically takes between 4-7 days, depending upon the water temperature. The warmer the water, the faster the eggs will hatch.

After hatching, the fry should attach themselves to their breeding surface, where they will continue to grow and develop.

Care for Newly Hatched Goldfish Fry

Once the fry hatch, the next critical step is to provide proper care. Newly hatched fry are very delicate and require a lot of attention and care.

Providing a balanced nutrition is essential. Brine shrimp is the most commonly fed food source for goldfish fry as it has a high nutritional value.

It is essential to have good aeration in the tank when raising goldfish fry as it provides better oxygenation and movement in the water. A sponge filter can be used to accommodate the fry without any danger of them being sucked.

Dealing with Dead Fry and Infertile Eggs

It’s common in breeding goldfish to have some eggs and fry that do not survive. Dead fry can lead to ammonia spikes, which can be deadly to the remaining surviving fry.

Removing dead fry as soon as possible is crucial. It is recommended to use substrate siphoning to remove dead fry from the breeding tank.

It is also essential to cull infertile eggs to keep the water conditions stable and prevent further ammonia buildup. FAQS:

Reasons for Floating Goldfish Eggs

One of the most common questions about breeding goldfish is why some goldfish eggs tend to float. Floating eggs typically indicate that the eggs are old and becoming less viable.

Another reason is that the eggs could be floating due to insufficient oxygen levels in the water. When oxygen levels are low, CO2 levels tend to increase, leading to the eggs developing a gas bubble that causes them to float.

Reproduction Habits of Goldfish

Goldfish are known to be prolific breeders, and under the right conditions, they will reproduce frequently. The mating process usually starts with the male goldfish chasing and nudging the female.

After mating, the female will lay her eggs, which usually stick to the breeding surface. The male goldfish will then fertilize the eggs.

Female Goldfish Laying Eggs without a Male

It is not uncommon for female goldfish to lay eggs without the presence of a male. Unfertilized eggs are usually a result of natural behavior and can occur even when there is no male present.

In such cases, the eggs are considered infertile and can be a potential breeding ground for bacteria or fungus, so it’s best to dispose of them.

DIY Spawning Mop

Making your own spawning mop at home is an inexpensive alternative to purchasing one in-store. You will need acrylic yarn or string and a spawning surface.

Cut the acrylic yarn or string into pieces of equal length and tie them onto the surface until it is fully covered. Once you have your spawning mop, simply place it into the breeding tank, and the goldfish will naturally lay their eggs onto it.


Raising goldfish fry requires a lot of patience, care, and attention to detail. By understanding the hatching period of goldfish eggs, providing proper care for newly hatched fry, and dealing with dead fry and infertile eggs, you can set your goldfish fry up for success.

Additionally, by answering FAQs about breeding goldfish, such as reasons for floating goldfish eggs, reproduction habits of goldfish, female goldfish laying eggs without a male, and how to make your own spawning mop, this article provides comprehensive coverage on raising goldfish fry. Breeding goldfish and raising their fry can be a rewarding, yet challenging hobby.

With the right techniques and tips, hobbyists can successfully breed healthy, thriving goldfish fry. The article covered tips for breeding goldfish, identifying goldfish eggs, raising goldfish fry, and answering some of the frequently asked questions about goldfish breeding.

Understanding the hatching period of goldfish eggs, providing appropriate care for newly hatched fry, and managing dead fry and infertile eggs are crucial for raising goldfish fry. The FAQs covered reasons for floating goldfish eggs, the reproduction habits of goldfish, female goldfish laying eggs without a male, and how to make your own spawning mop.

With proper preparation and commitment, raising goldfish fry can be a fascinating journey for hobbyists and pet owners.

Popular Posts