What Do Cory Catfish Eggs Look Like? (5 Essential Care Tips)

Are you wondering what do Cory Catfish eggs look like? It can be easy to miss when your Cory catfish lay eggs, but it’s worth knowing so you can care for the new little ones in your community tank.

As aquarium owners, you may already be familiar with Cory catfish, and their calm demeanor and small size make them a great addition to any freshwater tank.

They are also known to breed quite readily in the presence of other fish species.

If you’ve noticed clusters of eggs attached to driftwood or other tank furnishings lately, your old fish friends may have been busy making babies!

Corydoras egg development

In this blog post, we’ll take a closer look at Cory Catfish eggs’ fascinating and delicate world: their shape, color, size, and more!

We’ll also discuss how to identify them so that you can assess whether or not they are being cared for properly in your aquarium. So if you’ve meant to learn more about these incredible aquatic creatures and their reproductive habits.

keep reading to learn more about these exciting creatures!

How Do I Know If My Cory Catfish Are Breeding?

If your Cory catfish are breeding, you should be able to observe them in a distinct T-shape. This is when two adult fish join at their heads and tilt forward, forming an upside-down “T” shape.

During this time, they swim very close together and may even attach themselves to surfaces with their fins. One fish has a slightly swollen belly due to its eggs or milt (the male’s sperm).

In addition, you might hear a clicking sound as the males fan eggs with their barbels. If you observe these behaviors, your Cory catfish will likely start to breed!

What Does a Pregnant Cory Catfish Look Like?

When a Cory Catfish is pregnant, the most noticeable difference is a rounded or boxy bulge in the abdomen. This occurs as the female’s abdominal cavity starts to fill with eggs, and it can often look like they have overeaten.

Along with this physical change, female Cory Catfish may become more territorial or aggressive during pregnancy as they protect their offspring.

Additionally, some pregnant females may display darker colors than usual due to hormones released during reproduction. 

To ensure that your Cory Catfish is pregnant and not just full from its last meal, you should observe it closely for several weeks to see if the swollen area grows more prominent over time; this indicates increased cory catfish egg layers production and, therefore, pregnancy!

What Do Cory Catfish Eggs Look Like?

What do catfish eggs look like? Cory catfish eggs are small and white, approximately 1-2 mm in diameter. They are pretty brutal when touched and have an easily visible eggshell.

In breeding tanks, the eggs usually settle on a flat surface, such as the glass walls or the bottom of the tank.

As they stick to surfaces due to a jelly-like substance coating them, it is common for many eggs to be stuck together if left undisturbed for some time. After hatching, baby cory can usually be seen moving around within several days after spawning.

Cory catfish egg development

How Many Eggs do Corydoras Lay? Corydoras, or Corys, is a small freshwater fish in South America. They are an egg-laying species, with the female typically laying eggs anywhere from 25 to 50 eggs at a time.

Depending on the size of the female corydoras and her current health status, the number of eggs may range from just 10 up to 100 or more at a single spawning event.

5 Tips for Breeding and Raising Cory Catfish Fry

  • Provide plenty of hiding places in the tank for Cory Catfish fry, such as pieces of driftwood, plants, and rocks.
  • Use a sponge filter for mechanical filtration that won’t suck up the small fry.
  • Start feeding the babies tiny, live foods, crushed flake food, micro worms, baby brine shrimp, and freeze-dried foods such as newly hatched brine shrimp or daphnia.
  • Add an air pump or air stone to Perform water changes regularly to keep the tank clean and provide ample oxygen for their gills.
  • Separate any aggressive adults that may bother the fry, as they can easily be killed or damaged otherwise!

Cory Catfish are a unique species that can be a great addition to any aquarium. You can successfully breed corydoras in your home with the proper knowledge, care, and preparation.

How Often Do Cory Catfish Lay Eggs?

How often do Cory catfish breed? Cory catfish, or Corydoras or “Cories” for short, are popular freshwater aquarium fish. They have become beloved among aquarists due to their peaceful nature, hardiness, and dynamic behavior.

Regarding reproduction in the aquarium setting, they regularly spawn throughout the year, and they can lay up to 50 eggs every 1-4 weeks, depending on their age and health. 

Furthermore, one of the incredible things about cories is that they’re egg-scattering fish, unlike other species like livebearers and some cichlids, where the female carries fertilized eggs until birth or hatching.

Cory catfish lay eggs on surfaces like leaves and other scattered areas like rocks or driftwood, making them easy targets for smaller predators such as shrimp or fry if not taken care of quickly by removing them from the tank when necessary.

Therefore, watching for any spawning activity is essential, so you can remove those free-floating eggs before it’s too late!

How Do Cory Catfish Eggs Get Fertilized?

It’s a fantastic sight to witness: Corydoras Eggs getting fertilized! Most ichthyologists see the female using her pelvic fins to form a cup and then releasing 1-5 eggs into it, where they are regularly met by sperm that exits directly from her gills. Truly fascinating behavior in the animal kingdom!

The female usually fans the eggs with her fins before releasing them into the water. This motion helps to ensure that the eggs get a good dose of oxygen and that any debris is removed from them, improving their chances of surviving long enough for fertilization by sperm.

Once fertilized, these viable eggs hatch sooner, within 2-3 days, and the baby fish can be seen swimming around in the breeding tank. Removing adults from these tanks at this stage is essential, as they may attack or eat the fry.

With proper care, Corydoras eggs will produce healthy and vibrant adult fish that will bring life to your aquarium!

How to Tell If Cory Eggs Are Fertile?

Cory eggs are a great indicator of fertility. The first sign that you have fertile eggs is when they turn orange and sometimes even have black spots

These dark spots are caused by pores that form across the eggshell during incubation, which allows oxygen to pass through, giving it an orange or black look.

This indicates that oxygen has been passing through the shell, indicating fertilization has taken place, and the development of embryos is occurring within them. 

Aside from turning a darker hue, you can also tell if Cory eggs are fertile by examining them closely with a magnifying glass or microscope – usually revealing some embryonic development known as an ‘eye spot.’

If there’s no eye spot visible at this point, then chances are your egg isn’t going to hatch, but if there’s an eye spot present, likely, eggs hatched successfully!

What Do Fertilized Cory Catfish Eggs Look Like?

What do Cory fish eggs look like? Fertilized Corydora Eggs will look and feel different from infertile eggs. Fertile eggs have a dark orange or sometimes black color and may appear larger than their infertile counterparts.

Tiny pores can also identify them on the eggshell that acts as respiratory openings.

When held up to the light, fertilized eggs will also appear slightly translucent; furthermore, if examined closely with a magnifying glass or microscope, you may even see an ‘eye spot,’ which is a sign of embryonic development inside the egg.

Unfertilized Cory catfish eggs are generally smaller, have a white or yellowish color, and lack the same respiratory pores as their fertilized counterparts.

By paying close attention to these details and signs, you can ensure your Corie’s Eggs are healthy and viable, and cory catfish successfully hatch.

Do Cory Catfish Lay Unfertilized Eggs?

Yes, Cory Catfish can lay unfertilized eggs. Unfertilized eggs from Cory catfish can often be identified by their size, white or yellowish colors, and lack of the respiratory pores seen in their fertile counterparts.

They are usually relatively small, and when held up to the light, they will not appear translucent as fertilised eggs.

It is essential to identify whether your Catfish eggs are fertilized, as unfertilized eggs will not hatch and can rot and pollute the aquarium waters if left in there for too long.

If your Cory Catfish Eggs are unfertilized, removing them from the tank before they rot or cause water quality issues is best.

Do Corydoras Lay Eggs on Glass?

Cory eggs on glass can be a common sight in aquariums, as females lay eggs on the sides of the community tank or other smooth surfaces. These eggs usually stay attached to the glass until they hatch, and then the baby Cory will swim into the water.

It is essential to keep an eye out for Cory cats eggs on glass, as there may be some eggs that do not hatch. If you find any unhatched eggs on the glass, it is best to remove them from the tank before they start to rot and pollute the water parameter’s quality.

It is also important to note that Cory Catfish typically lay their own eggs at night when there’s little to no light in the tank. This means that if you notice eggs on the glass during the day, they might not be fertilized or viable and won’t hatch no matter how long you leave them there.

How Long Does it Take for Cory Eggs to Hatch?

Cory catfish egg hatching time can vary depending on the temperature of the water, with most eggs hatching within 4-6 days at around 25°C (77°F).

It is important to note that if temperatures are too high or too low, it could affect the viability of the eggs and prevent them from hatching.

Maintaining your tank’s water temperature at 25°C (77°F) is essential. To ensure successful hatching, add some cooling equipment, such as chillers or fans, to help regulate the temperature if needed.

Can You Move Cory Catfish Eggs?

How to Move Corydora Eggs Into a separate breeding tank? Spawning Corydoras catfish can be thorny, and sometimes eggs or fry get lost. 

If you’re having trouble spawning your Corydoras catfish, or if you’ve lost eggs or baby cory in the process, our video on how to move Corydoras eggs into a separate tank can help.

Moving the eggs into a separate container or breeding box increases your chances of hatching healthy fry. This video shows you how to remove the eggs from the original tank and safely place them into a nursery tank.

How Do You Get Rid of Cory Catfish Eggs?

Getting rid of Cory fish eggs can be challenging, but it is not impossible. Before discussing how to get rid of the eggs, it’s important to understand why cory catfish lay their eggs in the first place and what happens when they do. Many species of Corydoras Catfish require particular breeding conditions to lay their eggs successfully. 

Water conditions may include higher temperatures, water pH levels, or spawning surfaces conducive to laying egg clutches. Once laid on these surfaces, the female will guard them until they hatch (usually around 2-3 weeks later). 

Now that we have a better understanding of why cory catfish lay their eggs in aquariums and what happens afterward, let’s tackle ways on how you can remove them: 

1) Hand Pick:

The most straightforward way is through hand-picking when you spot egg clutches during routine tank maintenance checks. This method should only be done if you are sure that no adults are guarding them anymore, as this could cause distress to your fish(es).

Carefully scoop the eggs with tweezers or chopsticks before disposing of them properly outside your tank system – preferably away from other freshwaters like rivers or ponds! 

2) Use Eggs Traps & Sieves: 

Place traps such as egg tumblers or sieves at strategic areas throughout your aquarium so you can easily capture floating clutches without manually going through each corner – this comes in handy if you have plants and decorations scattered around! Make sure to check them weekly (at least) so no unhatched ones escape back into your main tank without being removed yet!  

3) Remove Adults:

If all else fails and neither hand-picking nor traps/sieves work, then removing adults might be necessary, especially if they keep trying to defend future batches despite not having any successful spawns yet, 

which usually indicates poor environmental conditions). It’s important, though, to note where adults were removed because some species might mix with other non-breeding individuals there; secondly, for rehoming purposes since adult Cory catfish can cause aggression with other bottom dwellers like plecos! 

Overall getting rid of cory catfish’s brood is easy once one gets familiar with standard behavior patterns seen by most recurring problems caused by overpopulation or inappropriate environments for breeding activities! Learning more about proper care beforehand would help prepare yourself better against future clutches involuntarily laying inside tanks frequented by us hobbyists 😉


So, what do Cory eggs look like? Cory Catfish eggs are a unique part of the tropical fish-keeping hobby that some aquarists look forward to seeing in their aquariums. Although individual eggs may look similar, experienced aquarists can easily spot their differences. Not only do Corydora eggs look fascinating, but with careful husbandry and vigilance, there is a reward in the form of watching these fries grow and swim around in your tank!

Ultimately, an aquarium filled with Cory Catfish will surely be a source of delight and enjoyment whether you are a beginner or advanced aquarist. Now that you have been given this information on what do catfish eggs look like, you will be better prepared when it comes time to see them appear in your community tank.

Interested aquarists seeking more detailed information should consider consulting their local pet store or an experienced aquarist for further advice and insight. This blog post has given you the information needed to give them the best possible chance at success in breeding Cory catfish!

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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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