Cory Catfish Eggs 101: A Comprehensive Guide (for Beginners)

Are you a first-time Cory Catfish breeder looking to breed and raise healthy Corys successfully? Congratulations! This Cory catfish eggs care guide is perfect for beginners seeking to gain valuable knowledge on the subject.

With helpful information regarding Cory fish egg care and ensuring proper conditions, this article will equip you with the necessary tools and confidence factors for caring for your Cory cat eggs.

From setting up tanks, preparing water environments, and creating optimal temperatures, as well as understanding different Corydoras egg fertilization methods and how to spot signs of hatching.

Cory cat eggs

The below information will tell you just about everything there is to know about breeding corydoras.

So grab some popcorn (figuratively speaking) because we’re about to dive into an in-depth journey of raising cory catfish from the beginning 🙂

Do Cory Catfish Lay Eggs?

Yes, Cory Catfish (or Corydoras) lay eggs. They are egg-laying fish known as oviparous. Generally, they will lay their egg layers on flat surfaces like stones and aquarium decorations in groups of several hundred eggs at a time.

corydoras egg

Once laid, the eggs must immediately be removed from the breeding tank, or the corydoras eat them. The hatched Fry can then be fed small live food until they are large enough for average flake food.

With proper care and nutrition, you can expect Cory Catfish to spawn regularly in your home aquarium!

How Often Do Cory Catfish Lay Eggs?

How often do Corydoras lay eggs? Cory cats lay eggs on average every 1-4 weeks depending on the season and environment. The optimal water temperature for breeding is between 75-80 degrees Fahrenheit, and the pH should be kept at 6.5 or higher, with a hardness of 5 dGH.

They prefer to breed in aquariums with plenty of vegetation, providing them with areas to drop their eggs, which can then get covered by plants’ leaves or gravel.

The male Cory Catfish will chase the female until she is ready to spawn. Then, he will fertilize the eggs as they are laid.

What Do Cory Catfish Eggs Look Like?

What do corydora eggs look like? Corydoras fish eggs are small and white, with a visible eggshell. They are usually found attached to the glass or plants of your aquarium.

Upon close inspection, you may notice several dark spots on them (known as blastomeres). When exposed to light, they will also take on an opaque hue.

You can also distinguish them from other fish eggs by their size. Corydoras fish eggs are typically about 1-2mm in diameter and lay in small groups of 10-20 eggs.

Do Cory Catfish Lay Unfertilized Eggs?

Yes, Cory Catfish are known to lay unfertilized eggs. They do not require a mate to lay the eggs, but they will still need a male present to fertilize the egg if they wish to breed.

The unfertilized eggs will typically look like tiny white dots at the base of plants or on rocks in the tank. If you want your Cory Catfish to breed, you should add some live plants and provide some hiding spots so they can lay their eggs safely.

Additionally, you can provide a shallow bowl filled with peat moss or Java Moss for them so that any laid eggs can be transferred there and kept safe from other fish.

Will All Corydoras Eggs Be Fertilized and Hatch?

The fact that a Corydoras has 50 egg sets does not mean it will ever be hatching. A male cannot fertilize all eggs. When breeding, keep an eye out for eggs in Corydoras to avoid contamination of fertilized eggs by fertilizing them properly. We’ll talk about care next time.

In many cases, fertilized eggs are higher than unfertilized ones, but there are no guarantees on the amount and percentage of eggs you get.

Infertile eggs cannot grow, and fertile eggs can only hatch once problems have accumulated, but not before they hatch. You will need an egg care plan when attempting to grow a cory catfish.

How Do I Know If My Cory Catfish Are Breeding?

Breeding Cory catfish is easy to identify. To know if your Cory catfish are breeding, watch for the classic “T shape,” where the female cory catfish curls around the male while he lays eggs near her caudal fin.

The female appears to act as a gatekeeper, staying close to him until fertilization of the eggs occurs. After that, she’ll leave.

Additionally, you can tell if a Cory is ready to breed by observing their size and the presence of egg spots on the anal fin of females; they become more visible when they’re ripe for mating.

How Do Cory Catfish Eggs Get Fertilized?

Unfertilized Corydoras fish eggs can be identified by their size, as they are smaller than fertilized ones. The male Cory Catfish will release sperm in the water to fertilize the female’s eggs.

As soon as she lays her eggs, he will swim around and release sperm which will attach to the eggs, fertilizing them. This process is known as external fertilization.

The male Cory Catfish will then stay with the eggs to protect them from any potential predators. The fertilized eggs will hatch into small corydoras fry within 4-6 days, depending on the water conditions.

Once the catfish fry hatch, they immediately start looking for food and should be fed regularly with a suitable diet.

How Long Do Cory Catfish Eggs Take to Hatch?

How long does it take for Cory catfish eggs to hatch? Cory fish eggs typically take up to seven days from the time they are laid to hatch, depending on the temperature of the water.

The ideal temperature for hatching is between 78-80°F (25.5–26°C). Since this species is egg-scatters and do not provide parental care, they must be kept in an environment with adequate food and water quality during this time.

Cory Catfish Egg Development

Unfertilized Cory catfish egg development: Corydoras fish eggs go through five distinct stages of development before hatching. The first stage is when the female lays her clutch of eggs, and the male fertilizes them. The second stage is when the eggs start to take on a distinct shape, usually round or slightly oval.

Next, the embryos will form within the egg, and their eyes will begin to develop during this third stage. During the fourth stage, the yolk sacs will start moving, and the baby fish will become more visible.

Finally, in the fifth stage, the Fry will be fully developed and ready to hatch. This is usually when they can start swimming freely around the tank and looking for food independently.

You should start providing them with a suitable diet that meets their nutritional needs.

In Short. Corydoras eggs can be fertilized and hatch if given the proper care and attention. Keep an eye out for eggs when attempting to breed Corydoras, as fertilizing them is vital to ensure the successful hatching of Fry.

Ensure that your community tank has all the conditions, such as temperature, pH and water quality, to ensure healthy eggs. Once the eggs hatch, feed your Fry regularly with a suitable diet.

With proper care and attention, you can breed Cory catfish successfully in your home aquarium. Good luck!

Fertilized vs. Unfertilized Cory Catfish Eggs

You’d even look at the eggs and wonder – how could you expect Corydora in the future? During 2-3 days in the incubator, Corydoras eggs fertilized become darker.

The darker brown spots indicate that the embryo is developing. Unfertile eggs will not change colors nor have moldy structures.

When an egg turns yellow or becomes sick, it is often thought to be the cause. Its most common symptom, however, is no mold but bacterial infection from dead material. These bacteria create white structures that resemble white mold.

How to Tell If Cory Catfish Eggs Are Fertilized?

How to know if Cory catfish eggs are fertilized? Fertilized Corydoras eggs can be identified by their size, as they are larger than the unfertilized ones. Additionally, you will also be able to see a significant difference in color between the fertilized and unfertilized eggs.

Fertilized cory eggs will appear more opaque and yellow, while the unfertilized eggs will be transparent and have a light, milky appearance.

Finally, if you look closely at the fertilized eggs, you should see the embryo beginning to form within them. This is an obvious indicator that they are fertilized.

How to Take Care of Corydoras fish Eggs?

Corydoras eggs are a delicate and essential part of your aquarium, but they can be hard to take care of if you need to know what you’re doing. 

If you’re unsure how to take care of corydoras eggs, you could quickly kill them or damage your entire tank in the egg-laying process.

In this video, we’ll show you how to take care of corydoras eggs so that they hatch healthy and strong Fry.

How to Adjust the Tank for Cory Catfish Eggs?

Cory catfish eggs will probably die if your water parameters don’t improve. List a few general aspects of the tanks you should modify.

The first step in caring for corydora eggs is to adjust their environment in your aquarium. It would help if you aimed to get the water temperature between 73-81°F (22-27°C).

You can also add a few plastic plants or rocks for cover and an air stone or air pump to help oxygenate the water for the eggs.

It would help if you also tried to keep a consistent pH level and ensure your tank is free of any pollutants or bacteria.

Finally, it’s crucial to provide adequate filtration so that the eggs remain in clean and healthy conditions. Once these steps have been taken, you can monitor the eggs and wait for them to hatch!

How Do You Treat Fish Eggs with Fungus?

Cory catfish egg fungus can quickly spread, leading to the death of your fish eggs. You must immediately act if you notice fungus forming on the eggs or if they appear to be turning white.

The first step should be to remove the eggs from the tank and place eggs in a separate container filled with fresh, dechlorinated water.

Next, treat the eggs with a mild fungicide such as potassium permanganate or hydrogen peroxide. Ensure you follow the instructions on the packaging carefully, as you don’t want to over-treat the eggs.

Finally, you should clean the tank and filter to ensure all traces of the Cory catfish eggs fungus have been removed. Afterward, carefully return the eggs to the tank and monitor them for any further signs of infection.

Where Do Cory Catfish Lay Their Eggs?

Cory Catfish, also known as Corydoras or Corys, is a popular aquarium fish and are some of the most commonly kept in home aquariums. When breeding these fish, knowing where they will lay their eggs is essential. 

Cory Catfish typically lay their eggs near hard surfaces such as plants or rocks. They tend to prefer vertical surfaces like tank glass because it makes it easier for them to stick the eggs on.

Once they have found a suitable substrate, they will often repeat it when spawning again in the future. The eggs are very sticky to adhere and stay attached to the chosen surface until eggs are hatched by fertilizing male Cory catfish nearby.

It usually takes 1-7 days for the sticky eggs to hatch after laying and can be seen squirming around before swimming off into open water once fully developed Cory fry!

Do Cory Catfish Lay Eggs on Glass?

Cory catfish eggs on glass are a ubiquitous sight. This is because Corys prefer to lay their eggs on vertical surfaces, making the glass in your tank one of the ideal places to lay their eggs.

You can usually identify corydora eggs on glass as white, round, and sticky. They will often be laid in clusters and usually hatch within 1-7 days, depending on the temperature and quality of the water.

Monitoring your tank for Cory catfish eggs on glass is integral to successful breeding. If you notice any, carefully adjust the environment in your community tank to improve the chances of successful eggs hatching sooner.

How Do You Hatch Cory Catfish Eggs?

Hatching Cory catfish eggs in tank is a relatively simple process but requires patience and careful monitoring. You need to know how the process works for hatching Cory Catfish eggs. 

You need to know how to incubate and care for the eggs to ensure your chances of hatching them are slim. 

This video will teach you everything you need to know about How You Hatch Cory Catfish Eggs. We covered you, from setting up the tank to caring for the cory fry.

Baby Cory Catfish fry needs special care, including providing the proper nutrition. One easy way to do this is by newly hatched brine shrimp, “baby brine shrimp,” or mosquito larvae– a process that can quickly be done in just one day! Doing so will ensure your little fish are getting all of their nutritional needs met for healthy growth.

What to Do When Cory Eggs Hatch?

What do you do when your cory catfish lays eggs? Once your Cory egg layers have hatched, you want to provide them with the best environment possible to ensure their survival.

The first step is to provide an ample supply of food for Fry. You can introduce live or frozen foods into the tank, such as brine shrimp or daphnia.

Next, you must keep the water parameters stable and check for signs of infection or fungus. If you n

Finally, monitoring the tank for any signs of aggression from adult cory catfish or other fish is essential. If any are spotted, take action to protect the Fry by removing them from the tank and placing them in a separate breeding tank.

Commonly Asked Questions about Cory Cat Eggs (FAQ)

How Many Eggs Do Cory Catfish Lay?

A female corydoras can spawn anywhere from 10 to 50 eggs in a single go, but the manner may differ between species – some deposit them all at once while others opt for a more staggered approach.

Do Cory Catfish Eat Their Eggs?

Corydoras females can be indiscriminate regarding the fate of their eggs. Be alert and take preventive measures during breeding to protect these precious fertilized bundles!

How Long Does It Take for Albino Cory Eggs to Hatch?

How long for Cory eggs to hatch? Albino Cory catfish eggs typically take 4 – 7 days to hatch. Once the eggs are laid, keeping the water temperature consistent is vital for them to reach the optimal Corydoras eggs hatching time.

When Are Cory Catfish Eggs Fertilized?

Cory catfish eggs hatching time will vary depending on the species, but typically they are fertilized after the female lays her eggs and is followed by a male who releases sperm to fertilize them. This usually occurs within 24-48 hours after the eggs are laid.

How Big Are Cory Cat Eggs?

Cory cat eggs are small and can vary depending on the species. Generally, corydora eggs are about 1-2 mm in diameter and are white or light yellow. It is also important to note that eggs can be difficult to spot, so check your tank carefully!

What do catfish eggs look like?

Catfish eggs are typically small, adhesive, and translucent or light yellow. They’re often laid in clusters on submerged surfaces in aquariums.

How long does it take Cory catfish eggs to hatch?

Cory catfish eggs typically hatch in 3-7 days depending on water temperature. Warmer water leads to faster hatching. If eggs haven’t hatched after a week, they may not be viable.

What do fertilized Cory catfish eggs look like?

Fertilized Cory catfish eggs are translucent amber or light brown, often developing a darker spot as the embryo forms. Unfertilized eggs stay opaque white.

What do Corydoras eggs look like?

Corydoras eggs are tiny, translucent spheres, about the size of poppy seeds. They’re usually amber or clear and laid in clusters on glass, plants, or decorations.

How long does it take for Cory eggs to hatch?

Corydora eggs typically hatch within 3 to 5 days, depending on the water temperature. Warmer water speeds up the hatching process, while cooler water slows it down.


Congratulations! You have come to the end of this comprehensive blog post on Cory cat eggs and are on your way to becoming a Cory Catfish spawning expert. It is important to remember to adjust feeding and environmental conditions so that your tank is suitable for breeding and egg production.

With patience and diligence, you should have happy, healthy cory catfish parents and fish fry in no time. Remember to provide an adequate diet for adult fish and fry to ensure optimum health. So why not give it a try? Utilize proper good husbandry techniques plus your newfound knowledge of Cory catfish eggs, and you’ll be rewarded with some fantastic fish babies in no time! And who knows – maybe someday you can become an expert breeder yourself!

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About Me

I am the founder of, a devoted wife and mother, and an avid fish enthusiast. My aim is to assist fellow fish lovers worldwide in understanding how to properly care for and breed their pet fish.

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