How to Stop Cory Catfish from Breeding? (A Definitive Guide)

If you’re like many Corydoras catfish keepers, you might have pondered, “how to stop Cory catfish from breeding?” Keeping Corys in a community tank is fun, but they can breed prolifically if given the right conditions.

Is your aquarium beginning to get crowded with Cory Catfish? Do you wonder why they seem to breed Corydoras so quickly, and what can be done to stop them from taking over the tank? If so, you’re not alone.

Many aquarists struggle with controlling their Cory Catfish population as these resilient fish are adept at breeding under optimal tank conditions—often without a mate!

How to Stop Corydoras Catfish from Breeding

Understanding how to prevent Cory catfish from breeding is critical in maintaining balance in your tank’s ecosystem.

In this blog post, we’ll cover some tips and tricks that will help keep your Corys from reproducing uncontrollably. Read on for more information about controlling their growing numbers!

Do Cory Catfish Breed Easily?

Cory Catfish (or Corydoras catfish or Corys) are some of the easiest fish to breed in the aquarium hobby. They have a broad diet and will spawn when provided with ideal breeding conditions.

Origin Corydoras are native to South America and swim in slow-moving waterways. These aquatic creatures enjoy the lush vegetation landscape and thrive in moderate temperatures for optimum living conditions.

Corys usually require two months of conditioning before spawning; during this period, they should be given high-protein foods such as worms, crustaceans, or pellets meant for predatory fish. During this time, it is also essential to ensure pH levels stay stable and that the water tank temperature remains at around 24°C (75 degrees Fahrenheit).

Lifespan of Cory Catfish

When ready to spawn, their food should be switched up using a variety of live and freeze-dried foods. Soon afterward, eggs may be laid on surfaces like plants or decorations near the substrate.

Removing the adults from the aquarium is best when the eggs are noticed since cory catfish eat their own eggs! The incubation period for Cory fry only lasts about three days before hatching occurs; after this point, many small fry and baby brine shrimp can be fed daily until reaching adulthood within a few months.

Enjoy the beauty of a Corydoras shoal in your aquarium! 6-10 catfish is ideal for keeping your tank clean while creating delightful aquatic displays, perfect for small and larger tanks.

If given proper care and attention, Cory catfish can quickly become one of your tank’s most successful and enjoyable breeds!

How Often Do Cory Catfish Mate?

Cory catfish mate regularly, usually every 1-4 weeks. They often form larger groups during mating season, and the males try to attract a female by flaring their fins and making circles around her.

During the mating ritual, the female will lay up to 200 eggs which the male then fertilizes. After spawning, it is generally advised to remove both parents from their natural habitat as they can become quite aggressive towards one another due to hormonal changes.

The eggs should hatch within three days, and the young fry should reach adulthood within 10-12 weeks, at which point they can begin reproducing again with other Cory Catfish in an aquarium setting.

It is important to note that Corys prefer larger aquariums with plenty of hiding places due to their shy nature, so any potential owners should keep this in mind when setting up an aquarium.

Additionally, live plants are used in an aquarium setup. In that case, these must be thoroughly checked for parasites and bacterial infections before being added. Cory Catfish are particularly prone to catching these diseases if exposed without proper filtration and quarantine procedures beforehand.

How to Stop Cory Catfish from Breeding?

How to stop fish from breeding? If you want to stop Cory Catfish from breeding in your tank, there are a few steps that you need to take. First and foremost, maintain your tank’s water parameters so they remain stable and appropriate for all the fish species in it.

Feeding is essential because overfeeding can lead to an increase in unexpected fish breeding. Avoid overcrowding the tank by limiting the number of Cory Catfish per gallon of water according to their size (usually 1-2 inches). 

Second, monitor any changes or changes in behavior among fish within the breeding tank, as this may indicate potential mating rituals. If spawning signs begin to show, such as females developing rounder abdomens or males showing nest-building behaviors, then separate them meaningfully from other non-breeding species.

For example, using a divider or netting, if available – while ensuring both sides get enough oxygenation through filtration systems and pumps set up on both sides of the divider/netting. 

In addition, recreate natural day/night phases within your aquarium by changing light settings accordingly during these different phases; this will help maintain low-stress levels while discouraging sexual rituals like spawning activity caused by sudden increases in temperature due to irregular photoperiods. 

Finally, consider adding more female than male fishes (e.g., 2:1 ratio) since more females mean less chance for them to spawn. Aggressive males would have fewer targets available, decreasing the chances of eggs being laid down at all times.

Following those steps should effectively reduce any unwanted fish breeding attempts likely coming from cory catfish swimming around your aquarium!

Water Conditions for Non-Breeding Catfish

Cory catfish need particular water conditions to thrive and remain healthy, so they must always maintain these parameters. For example, the tank water temperature in the aquarium should be between 72-75°F (22-24°C).

The pH should also be kept between 6.0-7.5, with the sand substrate at a hardness between 4-8 dH. These small changes in water parameters can significantly reduce the chance of your corys breeding.

Separate Male and Female Fish

It is much easier to prevent corys from breeding if you separate male and female fish into different tanks. It is best practice to house more females than males, as this will help ensure that no single male dominates multiple females within a tank setting.

Keeping males and females separated will also help reduce stress, as males can become overly aggressive when competing for mates or territory during spawning. 

Feeding Habits for Non-Breeding Cory Catfish

Another way to minimize cory catfish reproduction is by monitoring their feeding habits closely. Feeding too much can cause higher levels of hormones which ultimately trigger spawning behavior – so aim for moderation!

It’s best practice to monitor how much food each fish consumes before changing out any uneaten food after 15 minutes or so – this ensures that fish do not gorge themselves on live food, which could lead to overfeeding and ultimately unwanted spawning activity. 

How Do You Get Rid of Cory Catfish Eggs?

If your cory catfish spawn, you can easily remove the eggs by scooping them out of the aquarium with a net. The eggs will often attach themselves to decorations or plants within the tank, so inspect any hiding spots for any potential eggs before discarding them.

It is important to note that Cory catfish eggs usually hatch within 3-5 days after spawning, so removing them immediately is critical to prevent any raise fry from hatching and increasing your population of corys!

How Often Do Cory Catfish Lay Eggs?

Cory catfish typically lay eggs in the summer, when temperatures are more suitable for spawning. They can spawn multiple times a year if conditions are correct and minimal environmental disruption exists.

It’s best practice to monitor your corys closely during warmer times as this increases their likelihood of breeding.

What to Do If My Fish Breed?

If your Cory catfish do breed and the eggs hatch, it can be not easy to find homes for all of the fry. In this case, it is best to separate the fry into a different tank where they can grow and develop without any competition from adult fish. You can also donate breeding fish or give away excess fry to other hobbyists.

By following these steps, you can help ensure that your Cory catfish remain healthy and stress-free while minimizing the chances of unwanted breeding activity.

How to Stop Fish from Having Babies?

One can employ several methods to prevent fish from having babies. The first method is to physically remove all the eggs or fry (young) before they hatch. This is usually done by manually scooping them out of the tank or pond with a net when you see them.

The second method for stopping fish from breeding is to introduce male and female fish of different species into the same tank so that any eggs laid by most fish will not be viable due to hybridization.

The third way to prevent unwanted fish spawns is by changing the water temperature and chemistry in the tank, making it harder for fish spawning and egg-laying to survive. Raising or lowering the pH levels, ensuring enough oxygen in the water, and manipulating other elements within your tank’s environment can make conditions much less desirable for reproduction success.

Finally, if all else fails, you can always consider using chemical treatments such as hormones or contraceptives to prevent unwanted spawning among specific fish populations in a particular ecosystem.

How to Stop Tropical Fish from Spawning?

You can take several steps to stop your tropical fish from spawning. 

First, reduce the amount of light in the tank. Bright lighting conditions can stimulate spawning behavior in tropical fish. Make sure not to keep a timer on your aquarium lights and that they turn off around 10-11 pm each night. 

Second, adjust the water temperature as needed. Most freshwater species require temperatures between 74-80°F (24 – 27°C), while most marine species need their water at 76-82°F (25 – 28°C). Too high or too low temperatures may lead to spawning activity despite other preventative measures taken. 

Third, avoid overcrowding in your tank by ensuring enough room for all of the fish present and making necessary adjustments if one population starts getting too large or out-competing others.

When stocking a tank, keep different species separate as they could breed together and create hybrids that are difficult or impossible to control if kept near each other under proper breeding conditions. 

Finally, add chemical suppressants like “Spawn Stop” or “No More Fry.” These products use hormones designed to disrupt communication signals between male and female fish during the pre-spawning phase so fertilization does not occur naturally anymore, even if mating behavior is observed outside of its natural cycle timeline, which most often happens due to extended periods of succession with nutrient-rich diets near ideal water parameters etc.

How to Cull Fish?

Culling fish is one way to maintain a healthy aquatic environment. This involves removing fish underperforming in size or color compared to their tankmates and sickly or aggressive individuals. Culling can also help reduce overcrowding and improve the overall quality of water inside an aquarium.

When culling your fish, you should always adopt humane practices. For example, instead of netting and removing them from the tank, consider using a euthanizing solution like clove oil to put the fish to sleep painlessly.

You can also give unwanted fish away to other fish hobbyists or donate them to aquariums or research projects looking for new specimens.

Easiest Corydoras to Breed

The easiest Corydoras types to breed are:

  • The Bronze Cory catfish or Corydoras aeneus.
  • Peppered Cory catfish.
  • Pygmy Cory catfish.
  • Albino Cory catfish.

These fish species are hardy and easy to reproduce in captive settings due to their resilience against fluctuations in water temperature and pH balance.

They can reach sexual maturity at sizes as small as 1.5 inches (4 cm). Since they are excellent scavengers, they have few special dietary requirements beyond well-oxygenated water with plenty of algae to munch on.

Female corys deposit up to 200 eggs on solid surfaces when spawning, usually attached to plants or driftwood. The fry should hatch after around 48 hours and can be fed newly hatched baby brine shrimp as soon as their yolk sacs disappear after about four days.

Cory Catfish Breeding Behavior

Corydoras offers a unique breeding experience rarely observed in other fish species. Male suitors will relentlessly pursue females – eventually leading to the iconic “T-Position.”

Here, both fish lie motionless with their bodies perfectly arranged perpendicular; interestingly, it is up to the female’s mouth to collect sperm from her mate’s vent.

This breeding process is known as “embracement” or “semi-internal fertilization.” After mating, the female will lay her eggs on a flat surface or around aquatic plants. Most Cory catfish have an average lifespan of 7-10 years and can be bred in temperatures ranging between 74 to 82 °F (23 – 28 °C).

In addition, they may require pH levels between 7.0 and 8.5 to reproduce successfully in captivity. Ensuring the right water conditions during breeding season is vital for corys to spawn without problems. 

What to Do with Extra Fish in Tank?

If you find yourself with an abundance of fish in your breeding tank, there are some steps you can take to ensure that all fish tanks and the animals remain healthy and stress-free.

One option is to give some peaceful fish away to other aquarium hobbyists or donate them to aquariums, research projects, zoos, or schools. This can help reduce crowding and allow your fish to live in a more spacious environment.

Another good choice is to rehome the fish by finding a new home with someone who can provide them with proper care or by returning them to the wild when appropriate. However, research any local laws and regulations before taking this option.

Finally, you can always try culling the fish into a bigger tank by removing underperforming or sickly individuals from the tank for humane euthanasia. This can help maintain overall water quality and reduce overcrowding in the tank.

What to Do with Baby Fish You Don’t Want?

If you find yourself with an abundance of baby fish, you don’t want; several options are available. You can give them to other hobbyists or donate them to aquariums, research projects, zoos, or schools.

You can also rehome the fish by finding a new home with someone who can provide them with proper care or by returning them to the wild when appropriate.

Finally, you can try culling the fish by removing underperforming or sickly individuals from the tank for humane euthanasia. It is important to remember to take all necessary precautions to avoid spreading disease when dealing with baby fish.

How to Stop Pond Fish Breeding?

One of the most effective ways to stop pond fish from breeding is by removing any excess fertilized eggs produced by small fish. This includes scooping out any unhatched eggs and trimming back any plants that may be hosting fertilized eggs.

Another option is to place a small-mesh barrier across the water’s surface to prevent fish from entering shallower areas and laying more or fewer eggs there.

Finally, you can add chemical agents such as Potassium Permanganate or copper sulfate to your pond, which will help reduce levels of available nutrients in the water, making it less attractive for breeding.


Stopping Cory catfish from breeding doesn’t have to be complicated; there are steps that every Cory keeper can take to ensure their fish remain non-breeders! By maintaining optimal water parameters, separating male and female fish, and monitoring feeding habits closely, you will be well on your way toward preventing unwanted spawns! With proper care and attention, you’ll become a Cory catfish expert, and your catfish will remain healthy fish for years!

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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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