Breeding Goldfish | Things You Need to Know While Breeding Goldfish

To reproduce successfully, the goldfish need a different quality of care, which includes plenty of space, proper nutrition, and excellent water conditions, in addition to specific temperature changes to induce reproduction. Before jumping into breeding goldfish, you must know how goldfish breeds or how to breed goldfish in captivity. Always think about the amount of space available for the tank or pond. Do you have space for new fry besides your existing fish? If not, do not try to raise goldfish!

Goldfish are the most general pets for aquariums and as well as they are always in demand in the market. Goldfish lay thousands of eggs at a time throughout the breeding season. However, if other fish do not eat eggs, if most eggs are correctly fertilized, a large number of fry (baby fish) can be expected. But raising fry and goldfish is often expensive and slow.

If you want to learn more about keeping goldfish here is a book that I referred when I was a beginner “Goldfish (Complete Pet Owner’s Manuals)” This book was a nice little guide that answered several questions other goldfish guides left out. I especially loved the chapter describing the goldfish varieties available in pet stores. Overall, this book was easy to read and goes into detail about setting up your aquarium and bringing your first goldfish home. However, this book only contains the basic information that you can find in this article itself.

Many breeding goldfish owners want to grow their golden fish and feed their young for themselves. It may not be straightforward, but if done correctly, you can expect a tank full of goldfish hatchlings. All those who successfully breed colored fish seem to follow this path. Fish farming in the aquarium will require some preparation and attention to detail. It is not as easy as raising goldfish in outdoor ponds. This is because in their natural habitat fish have more space, oxygen, and plants to spawn.

Here, we go step by step through the things you have to do to provide the ideal conditions to encourage goldfish to breed to reproduce successfully. It is a fact that goldfish are ready to breed form 1 to 2 years of age, although they usually breed better at three years. They produce once a month from April to August, when the weather is warmer. Spawning provides a beautiful opportunity to learn more about goldfish.

About The Book “Fancy Goldfish: Complete Guide To Care And Collecting”

I have read tons of books about goldfish in the past and I found Fancy Goldfish: Complete Guide To Care And Collecting by Fish veterinarian Dr. Johnson the best one. This book contains all the information about goldfish. I was recommended this book as the only go-to book I needed by a goldfish breeder. She was definitely right. I find myself reaching for it often and I have experience with fancy goldfish.

What The Book Contains

Goldfish come in a range of sizes and looks that is truly amazing. Fancy Goldfish is the most encompassing and thorough treatment of the fancy goldfish hobby to date. With photographs, essays, and instructions from a variety of experts, this book will provide readers with all they need to embark on the fascinating hobby of raising fancy goldfish.

Fish veterinarian Dr. Johnson writes extensively on goldfish health and disease, including microscopy techniques, diagnosis, treatment, and prevention of the full span of goldfish diseases. In a helpful and accessible “frequently asked questions” format, Richard Hess provides a general introduction to all aspects of the hobby, from selecting the best fish, aquarium setup, maintenance, feeding, sexing and breeding, and keeping fish healthy. Jackie and Louis Chan, major exporters of fancy goldfish from China, discuss the tradition of goldfish appreciation in China, and a chapter on Japanese goldfish describes the history and standards of uniquely Japanese varieties and the techniques and secrets of Japanese breeders. Izhak Kroshinsky, a leading breeder of Ranchu in America, describes his methods for cultivating a superior strain over the last twenty-five years. With over 100 color photographs of beautiful specimens and rare varieties by Fred Rosenzweig, this book is a stunning visual reference as well.

My Message To Readers

If you want to keep goldfish, and be a successful pet owner, get this book.

If you are new to goldfish keeping, and trusted the people in a pet store, please for the love of goldfish, get this book, and start on page 19. This will explain the importance of water quality, and how your fish cannot survive without your diligence. Fair warning- it’s nerdy, but it’s the most important part of keeping fish. Hands down.

You have control of your fish’s life, and you can do this.

If you have ever thought that “nobody has ever felt more helpless than the owner of a sick goldfish” then for the love of your fish, get this book.

I know there are a TON of sources for fish answers on the internet, and even MORE questions. And those forums on big pet store websites? Don’t trust them. 95% of those people have no idea what they’re talking about.

You cannot keep a goldfish in a bowl. JUST SAY NO.

This book is a lot of compounded information about goldfish, and can be quite intense for beginners.

Don’t feel overwhelmed. It is a lot of knowledge you should know if you want to properly care for high maintence fancy goldfish.

The reason why big pet stores do not offer things like this is because their profit margin would suffer, and they would rather have you kill your animal not-knowingly, and come back to their store to buy more fish & equipment.

Knowledge is your animal’s survival kit, and this book will help you understand things you need to know where both the internet, and large pet stores have failed you.

Now let’s look at some of the pieces of equipment you need to breed goldfish.

Goldfish breeding equipment’s

Main tank, or a pond

The breeding tank can vary concerning size, dimensions, and even water level. It must be adequate in size and with an appropriate filtration system.

Tank for fry

Establish a smaller container for the fry. This fry tank should have between 10 and 20 gallons and should only be a depth of between seven to eight inches, with water from the main tank.
If you don’t have one you can buy “Aqueon Fish Tank Aquarium Led Kit, 10 Gallon“. Amazon is providing this tank for a great deal comes with all the equipment you need to set up the tank for your fry.


Goldfish reproduce in the spring. Because of this, a change in temperature (from the cold winter to the warmer spring) triggers breeding. Therefore, the proper aquarium heater should be implemented in the aquarium.

Artificial plants (silk or plastic) or real plants

Floating plants, such as the water goblin and the hornwort, are often spawning places where goldfish lay eggs. These plants protect the eggs and fry of predators until they can fend for themselves.

Pond Oxygenating Hornwort Bunch Plants

A sponge filter and air pump for the fry tank

These are soft filters that can clean a tank but are not dangerous for the fry. Other filters can suck and kill them whereas a sponge filter acts as a biofilter not harming the fry. For a sponge filter, you will need an aquarium air pump to run.

Spawning mop

Generally, a spawning mop is made with knotted thread and floated on the surface of the water on a cork. Spawn mops offer certain fish with a place to lay their eggs and as well as for the fry to hide until they swim efficiently.

Aquarium Divider

For tank separators, you can use glass or acrylic boxes. They keep the goldfish away from the eggs (so they do not eat them), or the aggressive parents move away from other fish in the community. These dividers will always allow the flow of water to all areas of the tank, so the water quality does not decrease.

Tank setup for breeding goldfish

It takes extensive time to make the right atmosphere for breeding. Buy your fish almost a year before. To buy your fish July and August are the best months, as goldfish like to breed during spring. You will want your breeding pairs to adjust correctly to its habitat and remove the stress before the goldfish breeding season, so try to plan well in advance. The main thing to is to clean up your afresh bought breeders. By adding 90 drops for the eyes of Formaldehyde, seven drops of copper sulfate and only two minor amount of Terramycin, you can clean the breeding tank so that tank is healthy.

The tank in which you plan to raise them must contain at least 20 gallons (75.7 liters) of water. Also, add the necessary accessories for natural-looking golden fish habitat. This usually includes natural or artificial shrubs or fertile and extensive fibers. When females lay their eggs, they typically anchor them into something substantial. If you are going to let them reproduce naturally, you will want an exuberant environment. If you are going to raise them artificially, you do not need plants, although they improve the quality of life (and act as an excellent water filter) when the fish do not reproduce.

A light floating nylon rope is used to make spawning mops, in which the females send their eggs. You do not need spawning mops if you have many shrubs, plants or other fibrous material, but they are an easy and efficient way to protect your eggs from golden fish. Since adult goldfish tend to eat any uninsured egg. Without abruptly changing the food diet of your goldfish, begin introducing non-pelleted foods into your tanks, like brine shrimps or live black worms. This pretends the natural profusion of spring when goldfish like to breed.

A tip on nourishing your goldfish, in general, is to feed your golden fish in small amounts. Feed them three times a day, taking care not to overfeed them. Various breeding goldfish owners make the mistake of feeding their fish too much; the leftover wastes remain uneaten, drop to the bottom of the tank, rot and spoil the water. No matter what you feed them, be sure to crease them small sufficient amount to fit in their mouths.

Simulate spring season in your tank by dropping the temperature and then gradually making it warmer for the fish. How to breed goldfish in the spring? So, you must duplicate the water heating as goldfish want. To do this, first, lower the temperature to between 10 ° C (50 ° F) and 12 ° C (54 ° F). Then, when your goldfish are ready to reproduce, increase the temperature of water by 2 ° C (3 ° F) per day, until the temperature is between 20 ° C (68 ° F) and 23 ° C (74 ° F). Make sure you cycle every day.

A partial water change is essential for the general welfare of your fish and to specifically stimulate breeding conditions. Remove up to 20% of the water in your tank daily and make sure you do not exceed this amount. And also remember to add water conditioner to the water that you add to the tank. Conditioners counteract harmful chemicals for their fish, as well as eliminate chlorine and as well as offset chloramines.

Differentiating Male and female goldfish

Breeding Goldfish

1. Know what a female goldfish tend to look like

Sexing your golden fish is perhaps the most significant task in breeding goldfish, if you link a group of male fish because you cannot tell them apart, you will not end up with any posterity.
This is what women tend to be:

  • Look at the form of your ventilation. A vent is a small opening between the anal fin and the anus, where the fish excrete ovules or sperm, depending on the sex. The female vents are round and convex, like a convex navel.
  • Feel the abdomen. Female abdomen, between the pelvic and anal fins, is very soft.
  • Look at the pectoral fins. The pectoral fins of the females are round and short.
  • In general, the female goldfish tend to be a little bigger and round than the male goldfish, which tends to be longer and more pointed. This, however, is a less reliable way of distinguishing them.

2. Know what a male goldfish looks like.

Male goldfish tend to be a little smaller than their female counterparts. They can also be distinguished by observing the following features:

Breeding Goldfish

  • The presence of small white stars or tubers on the gills. The tubers are small bumps that appear in the fins, the head and even the gills of the males when they are ready to reproduce.
  • Concave ventilation, or innie. The males have a ventilation hole that opens inwards instead of bulges outwards.
  • Feel the abdomen. The abdomens of the males are much more rigid and hard than those of the females.
  • Look at the pectoral fins. The pectoral fins of the males are more pointed and more extended in comparison with the short and round pectoral fins of the females.

3. Observe the behavior of breeding goldfish to separate males and females.

During the breeding goldfish season, the males begin to chase the females, slowly at first but with greater enthusiasm. Add a known female goldfish in the tank and look for the reaction of the other fish: the males will show a lot of interest, while the females will show none!

Breeding Goldfish

Steps for breeding goldfish

Choose your best breed

The robust young goldfish are ideal because of their high fertility and sexual desire. For a female goldfish, look for those with a broad back and pectoral areas; For a male, look for a significant partner (approximately between 4 and 6 inches) who is also a fast swimmer. Males with many small tubers behind the head in their gills are a sign of an ideal mate.

For an ideal combination of breeders, try to isolate your three best female goldfish and two best males.

Introducing Goldfish

Introduce breeding goldfish in the tank and look for natural spawning (include one female two male or 2 female three male for breeding goldfish)

You will notice that the male golden fish will have a lighter tint around the stomach area and will swiftly swim around the tank, usually chasing the females. The female will throw the eggs on one of the plants, once the male breeding goldfish distribute sperm on the eggs to fertilize them. If you lose the moment of procreation, but you see eggs in the plants, it is likely that they are fertilized.

Breeding goldfish artificially if natural spawning is unsuccessful

Insert a male and a female together in a shallow tank. Lightly hold the male golden fish and gently rub its vent, clearing it of the sperm. Spin the sperm in the water and repeat the same process with the airing of the female, freeing their eggs.

Be very ginger with artificial insemination. Your goldfish contusion easily; therefore put on very light burden when cleaning the air circulation grilles.
You do not have to keep your golden fish underwater while squeezing their vents. Goldfish, like most of the other fish, can breathe out of the water. But make sure that you keep them out of the water for no more than 30 seconds at a time.
Separating goldfish from eggs

Unfortunately, while breeding goldfish in captivity, they tend to eat almost all of their eggs. So, it is necessary to separate the parents from their eggs practically immediately to ensure that a full batch of eggs is successfully incubated. Inseminated eggs should hatch within 5 to 7 days, depending on the temperature of the aquarium water.

When the eggs finally hatch soon after being fertilized, you can feed them with the same food you feed the adults. Just make sure they are in bites even smaller than those of adults so that their smaller mouths and throats can swallow them.
Try to keep the eggs in the same water in which they were raised. Transplant only at your own risk.

What to do with goldfish eggs

Unfortunately, the goldfish will eat its eggs, so you cannot leave them in the main tank! Therefore, you must remove them from the tank or pond as soon as possible.

Remove the eggs (or the entire plant or spawning mop) and place them in the smaller fry tank that you set earlier.

Make sure the frying tank has a temperature similar to that of the main tank, between 20 ° C / 68 ° F and 23 ° C / 74 ° F. Use a heater to raise the water temperature if necessary slowly.

Lighter colored eggs have a much higher likelihood of hatching, so you can get rid of dark eggs and keep lighter ones.

Feeding goldfish fry

You should not feed goldfish immediately. During the first days after hatching, the fry will be at the bottom of the tank and do not need food. Only when they begin to swim freely around the tank is it necessary to feed them.

Once the fry begins to swim, but while they are still too small for fish foods, such as Hikari First Bites, you should feed them with egg yolk dissolved in water. To do this, you need:

  1. Boil an egg hard
  2. Break a piece of yolk (about the size of a pea)
  3. Put the yolk in a sealed jar of water from the fry tank
  4. Shake the jar until the egg is mixed and the water looks cloudy
  5. Pour minimal amounts (only a few drops) into the tank at a time and store the rest in the refrigerator for future feeding sessions.
  6. Make a new batch once every few days so that you are always using a reasonably fresh egg.

Fry Food Here:

Golden Pearls 2oz

“Golden Pearls” is a revolutionary new larval diet that is currently experiencing great success in marine fish and shrimp hatcheries worldwide. The secret to its success is an innovative manufacturing process which involves the agglomeration of micro-encapsulated particles that “traps” tiny air pockets inside of the feed particles. This results in a “non-sinking” particle diet that remains suspended in the larvae tank. The introduction of Golden Pearls has significantly reduced the dependence, and in some cases, replaced live feeds (rotifers and Artemia nauplii) in commercial marine fish and shrimp hatcheries.

Ingredients: High-quality fish meals, crustacean meal, purified fish oils, phospholipids, astaxanthin, vitamins and protected minerals, antioxidants, and immunostimulants.

Analysis: Protein – 60%, Lipids – 8%, Ash – 15%, Moisture – 8%, Vit C – 2000 ppm, Vit E – 400 ppm, Astaxanthin – 500 ppm.

I personally prefer brine shrimp for feeding my young fries since it contains high protein and all the macronutrients that helps your fry to be healthy. Get the freshest and fastest shipped brine shrimp eggs for your fish! We are experts at handling and shipping brine shrimp eggs. Our eggs come from trusted US sources. Don’t take the chance of getting old or poor quality eggs of unknown origin. Get the best!

  • Analysis: 60% Protein, 24% Fat, 4.4% Ash, 8.5% Moisture. Specs: 90% Hatch Rate

Brine Shrimp:
Finally, do not add any fry to the main tank until they are large enough to survive with other fish. This means that they must be strong swimmers, too large to be absorbed by the filter and more significant than the mouths of adult fish.

One thought on “Breeding Goldfish | Things You Need to Know While Breeding Goldfish

Leave a Reply

Your email address will not be published. Required fields are marked *