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Hi,

I have 2 questions about breeding Corydoras.

1) I added a streaming pump in my aquarium (before it only had a sponge filter), and now I see eggs everywhere... does having some current do good to Corydoras? Or is it just a coincidence? (I did nothing special about water change or temperature.)

2) I have put the eggs in a glass jar, like the "Fish Spawn Rearing Kit"; http://www.angelsplus.com/SuppliesBreedingSpawn.htm , but some species of fish require to gulp air to fill up their swim bladder, basically, is it a problem if the larvae have no access to the surface?

Hi axolo,

axolo wrote:1) I added a streaming pump in my aquarium (before it only had a sponge filter), and now I see eggs everywhere... does having some current do good to Corydoras? Or is it just a coincidence? (I did nothing special about water change or temperature.)

I don't know if it was a coincidence or not, but I keep my aquarium water level a few centimeters below the outflow of my HOB power filter, so that the water splashes down into the tank, creating turbulence and aeration. I have often found my corys swimming in this water current, and my albino corys like to spawn directly under this current (and in other places too, so they don't pick this place exclusively).

axolo wrote:2) I have put the eggs in a glass jar, like the "Fish Spawn Rearing Kit"; http://www.angelsplus.com/SuppliesBreedingSpawn.htm , but some species of fish require to gulp air to fill up their swim bladder, basically, is it a problem if the larvae have no access to the surface?

In my experience with regular bronze corys and albino corys, raising the young is no trouble. Honestly, your kit looks more complicated than anything I've ever used for hatching/raising my cory fry. But to answer your question, I would say that yes, once your fry are feeding, they will occasionally want to swim to the water surface (although not as often as the adults).

You did not tell us which cory species you are breeding. Can you provide that information? Also can you please describe your tank setup? And are you raising your fry in a different aquarium from the parents? or are you trying to leave the eggs/fry (within this jar) inside the parents' tank?

Cheers, Eric

Hi,

The species.. well I have several cory species in the tank at the moment, the usual I guesse, C. Sterbai/ C. aeneus / ... , so I dont know what kind of hybrids will come out, altrough I seem to see the males always chasing the females of the same species, so maybe they don't mix at all. Anyway, the fry is in the same water as the elders, but in a different (linked) aquarium. I am just using this setup to do a test run, I have several small Corydora Aeneus Sp Gold Stripe, who I would like to breed when they are ready, and I am using the current spawns as tests.

Axolo: if you read for some methods to emulate rainy season for hardy coryes to breed, one of the tips is to increase the flow of the water to emulate increased flow on rivers by rainy season.

Many Species like to play in currents. C. aeneus will lay eggs on the lift tubes of a power filters or on the wall the water flows into.

As for furniture on a budget. PVC tubes make great cave. A piles of rocks in the corner gives a place for young fry to hide. Some cories might bury eggs in sand. Get some that has no sharp edges. Also have several types and textures of plants. Java Moss or even a clump of hair algae works. Some yarn spawning mops can be tried.

You should really try to avoid hybrids. If you must mix cories put two together that you can tell if they cross. Apparently C. panda do have know hybrids.

Yes, I agree with the flow. Mine live in high flow naturally and spawn regularly. In one tank I had very high flow over 20x including a large powerhead, the corys kept trying to lay eggs on the sides of the powerhead until I had it. They loved that spot.

The babies need access to the surface from get go. This jar doesn't seem suitable at all for cory fry. The fry need surface area at the bottom not depth, a bit of sand to cover the bottom. If properly grown by for weeks they'll be an inch(about 2.5cm) big so that's way too small unless you want to grow just a couple of fry.
The best way is a proper baby tank, cycled and filtered well. They grow fast to good sizes.

just in the filterflow this morning !!!