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Cory Catfish come in about 150 different species, each with its unique features and breeding preference. These freshwater fish like to mate with similar species and produce offspring regularly. But how often do Cory Catfish lay eggs?Cory Catfish will lay eggs almost every week if kept in ideal conditions. Usually, Corydoras lay about ten to fifteen eggs, not hundreds like other fish. The eggs are also typically placed on the glass of their aquarium until they hatch.
This article will explain how often your catfish will lay eggs. We will also discuss how to breed Corydoras and safely raise their eggs until hatching.

Can Cory Catfish Lay Eggs Every Week?

Your Cory Catfish can lay eggs every week, and as long as the proper conditions are present, Corydoras will breed frequently.You can expect a yield of 10 - 15 eggs at a time from each of your Catfish. But exactly how many offspring they produce is affected by several factors, including:Their foodThe lightingTank sizeWater temperatureGeneral fish healthEnvironmental factors like plantsThe amount of fish inside the tankGenerally, you can anticipate your Corydoras to produce multiple healthy eggs. And once the mother releases the eggs, she will stick them to the glass or near a plant until they hatch.

How To Tell if Cory Catfish Eggs Are Fertilized

Fertilized Cory eggs are beige with dark spots. In contrast, infertile eggs are white, plain, and translucent. A simple observation can confirm for you which eggs to keep (those that will produce live Cory Catfish).Remember that fertile eggs do not produce healthy offspring all the time. So, it can be difficult to conclude which fertile eggs are worth keeping from a purely visual inspection. There is always a chance your pet Catfish produced weak fries, even if both breeding fish were healthy.
As the owner, you will have to wait until the eggs hatch to discover which Corydora offspring are the strongest.

How Long Does It Take for Cory Catfish Eggs To Hatch?

Corydoras eggs will normally hatch in three to six days. It is safe to let the eggs hatch in the same tank where they were bred, but most aquarium owners suggest transporting the eggs to a new tank before they hatch.If the eggs do not hatch in about a week, the eggs are infertile and can be disposed of after the hatching period has ended.

How To Breed Cory Catfish

Photo by Aqua Life Hub
Breeding Cory Catfish is a relatively simple process because this species breeds so often. However, avoid breeding catfish that are less than one year old, and make sure all bred Corydoras are at least 2 ½ in (6.35 cm) to be eligible for breeding.Therefore, it"s best to have a dedicated breeding tank for this purpose. After all, Corydoras are more likely to breed in comfortable environments where mating is done regularly.
The breeding aquarium should not have any accessories, and you should fill the tank with water and rounded gravel or sand only. Substrate is optional. But if you do choose to add sand, use small amounts.Most breeders induce mating by switching out about half of the water in the tank with colder water. Avoid using freezing water for this because it is damaging to the fish. For the best results, choose water 2 to 3° F (-16.6 to -16.1° C) colder than normal. If you want to be exact, have a thermometer to test the water before and after the addition.The water"s temperature should never drop below 65° F (18.3° C). These conditions discourage breeding and can even harm your fish.The decreased temperature reminds the catfish of rainy weather, which is their natural breeding condition. For this reason, some breeders introduce rainwater to their aquariums to provoke mating more naturally. However, this method is not recommended for beginner breeders because it can introduce unwanted bacteria to the Cories" environment.Additionally, experts recommend feeding your fish live food to encourage breeding, like:WormsInsectsEggsLarvaeNot to worry though, while your cory catfish may enjoy live foods, they are unlikely to bother any shrimp or snails you keep in your aquarium. They are bottom feeders who tend to pick through leftovers of everyone else"s meals. Once you fulfill the fish"s criteria, spawning should occur in a few hours, and the fish will enter into a T shape when mating has begun. But if the fish do not begin breeding after several hours, you should empty more water from the tank and add colder water. In most cases, this improves the chances of fish breeding.
If the fish still do not begin mating, try again later. The lack of sexual activity could mean that the Corydoras are not comfortable or are too immature to reproduce.

What Is the Difference Between Male And Female Cory Catfish?

Generally, you cannot tell the difference between male and female Corydoras while they are still young. You will have to wait for the fish to grow to a minimum of two inches before you can tell them apart in most cases. Once the fish are mature, you can differentiate between the sexes using their size.Male Corydoras are usually the smaller fish in the aquarium. Additionally, they have less rounded bellies than their female counterparts and a wider variety of colors with larger dorsal fins and pointed anal fins.A sure sign to tell if the Catfish is male is by observing if they chase during the breeding season. And if they do, you will see one to three mature Corydoras pursue a single Catfish.
In contrast, the female Cory Catfish are wider with thick midsections and tend to swim higher than male Corys do.You will typically want to keep your tank balanced and have one male for every female, though it is also safe to have two females for every male Corydora. However, you should avoid overcrowding your tank with males.When Cory Catfish become sexually active in a majority male tank, the female Corydoras usually get harassed. This behavior can cause the premature death of your female Catfish. Therefore, make having a balanced tank your top priority as an owner.

How To Tell If Your Cory Catfish Is Pregnant

Mature female Corydoras swell up with eggs. Therefore, if you notice that your Cories have become swollen, they are most likely carrying offspring. But be aware that Cories bear children quickly, so you should keep an eye out when the swelling decreases.Sometimes, Corydoras will lay their eggs near plants, decorations, or the water filter. Ensure that you inspect all these areas for eggs once you notice pregnant fish.

What To Do With Cory Catfish Eggs

Corydora eggs should be transported to a separate tank from their parents to hatch because this approach improves the young fish’s survivability.
To remove the eggs, you need a razor blade or a credit card to scrape them off of the tank, but you must be gentle during this process. Corydora eggs are delicate, and you can easily squish them if you’re not careful. Also, have patience when transporting your eggs because the process can take up to an hour if you"re inexperienced.After scraping the eggs from the tank, it is time to transfer them without exposing the young Cories to air. The best way to do this is by using an egg tumbler. Egg tumblers are designed for fresh eggs and improve the chance of successful births. A good recommendation is the PIVBY Fish Egg Tumbler because it does a great job at preventing fungus while your eggs develop.Although breeding is simple, successfully hatching Corydora eggs is challenging. Many breeders recommend adding an airstone to the eggs" tank to boost live birth rates.

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Final Thoughts

Corydoras can lay a lot of eggs over one month. However, only some of these eggs will be successful. If you are starting to raise Cory Catfish, LRB Aquatics - Aquarium Hoarder has a video that is a step-by-step guide for successfully breeding, hatching, and raising young Catfish:
Cory Catfish are social creatures, so it would be best to populate your tank with the same Corydora species to boost their breeding rates.
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