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Fish Tank Forum • View topic - Breeding Corydoras
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Breeding Corydoras

Planning on breeding fish or already breeding them.

Breeding Corydoras

Postby Mick » Fri Apr 03, 2009 10:41 pm

One of the cutest fish to keep in the aquarium has to be a member of the Corydoras species. They are so funny to watch with their antics and look so adorable. There are a few species of these that have never been successfully bred in the aquarium but hopefully in the next few years this will change and th ey will all be available as tank bred specimens.

Setting up the breeding tank

When setting up your breeding tank you are looking for one with a large surface area ( the footprint of the tank should be long and wide) as the water needs to be well oxygenated but you are only using a shallow depth of water. Place an heater in the tank set at 26 deg C and add an air driven sponge filter or a small internal filter. Use fine rounded gravel for the substrate and add a couple of plants (real or artificial), some species of Corydoras prefer to lay their eggs on the leaves.
Adding a couple of hiding places in the form of rocks or wood may also help to put the fish at ease.
Corydoras are group spawners, select 3 males and 3 females to add to the tank. Females, when viewed from above will be slightly larger than the males with a stockier body shape.
Plenty of water changes need to be performed as nitrate build up will affect the spawning process. The nitrates have to be below 10 for your breeding to be successful. Condition the fish with plenty of live or frozen foods, condtioning can take up to 2 weeks.
The secret to induce spawning is to do large water changes with cooler water, as soon as one pair start to spawn, the other two will soon follow suit. Eggs will be scattered everywhere, on the tank glass, all over the filter and on the substrate. Unfortunately the parents have a particular fondness for eating the eggs. The eggs need to be moved to a small fry tank once they have hardened, this can take a couple of hours after laying.
The fry tank should be bare bottomed for ease of cleaning and there is no need to add a filter at this stage just a reliable heater set at the same temperature as the breeding tank.
Fill the tank with water from the breeding tank and move the eggs over into it. The eggs that are stuck to the glass can be removed with a sharp stanley blade.

Rearing the fry
To help prevent fungus in the eggs, place them on the fry tank glass with an airstone softly running below them, the eggs are sticky and can easily be stuck to the side of the tank but be careful not to damage them.
The eggs should be beige in colour and black dots should appear in them after a day.
3 days later they should hatch and the fry will be very, very tiny.
Feed the fry on infusoria or use a liquid fry food that is available from the pet stores. After a few days change their diet to newly hatched brine shrimp or micro worms.
Daily 20% water changes are a must, fry food very quickly contaminates water, skipping the water changes will result in high mortality rates.
As the fry grow they will need moving to a larger growing on tank and should start accepting crushed flake, adult artemia, or daphnia.

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Re: Breeding Corydoras

Postby NightwishRaven999 » Fri Apr 03, 2009 11:40 pm

Thank you for this informative and well written article Mick.
I have learnt much about Corydoras breeding habits because of this.
I have three at the moment, if I get more, I will try out what you suggest.
Its fascinating to me that they are group breeders, I am used to each pair of fish breeding when they want. Seeing three pairs breeding almost simultaniously and being conditioned together sounds amazing.

I will try this one day.
Thanks again, very informative. I will go to bed smarter tonight :)
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Re: Breeding Corydoras

Postby Rancid » Sat Feb 26, 2011 3:58 pm

Thanks for the article, very informative, I always thought Cory's are very hard to breed...
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Re: Breeding Corydoras

Postby Anita » Sat Feb 26, 2011 6:16 pm

Great little fish, it's a shame many people don't keep then in large enough numbers to observe their natural behaviour.
Well written Mick, well done :thu:
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Re: Breeding Corydoras

Postby fishlover10 » Sat Nov 12, 2011 3:56 pm

i love corydoras, i have 11 at the moment and plan on getting lots more, this will help lots if they breed
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Re: Breeding Corydoras

Postby aponom » Mon Nov 14, 2011 6:24 am

Corys like to live be shoals and it is best if you keep groups of 6 or so for breeding.

The females are larger than the males by at least 1/3 and they get plump.

To trigger spawning do a cold water change of about 15% if this does not lower the temperature by 2-4 degrees C, try a bigger cold water change. Some people add ice cubes to lower the temperature.
The temperature changes mimic cool rain fall that goes with the Cory’s natural breeding cycle.

I've always found it easier to remove the adult fish and raise the eggs in the tank they are laid in. This is because the eggs are often laid in places like on the glass and everywhere. It is easier if there is no gravel in the tank as the fry will need tiny food that might get lost in any gravel and pollute the tank.

Raising the fry is very easy as they will take finely crushed flake food, but live foods like vinegar eels or micro worms are less likely to pollute the tank...because they are alive.
Make sure you always remove any uneaten food before it rots.

As the fry grow you can move them over to larger foods, then you will be well on your way to raising your 1st batch of Cory’s.
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