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I was just wondering how hard is to get Corydoras trilineatus spawn? I have 7 of them, one got in this week, the other six acquired 3 month ago. They are very timid. Size is about 1.75 inch TL. I feed them live worms and sinking shrimp pellets. I haven't seen any clear male/female differences by now(they seems to be all male to me). So does it mean that they are still young?

Welcome to Planet catfish

see this http://www.planetcatfish.com/catelog/sp ... ies_id=508

Although they've been bred they are certainly not as easy as many other species, particularly for a readily available species

Thanks Richard! I found this link before I made this thread. It gives a lot of info, but did not mention how hard it could be (actually, it sounds easy to me LOL) How you successfully bred them? Do you think a 10G tank will do the job? I used to breed the common green/emerald cory in a 10G every other week. Thanks again!

I've not bred these at all - corys are not really my thing. however a friend had them breed by accident as he was conditioning them up but was unsuccessful in all his planned attempts & very few fry were raised successfully - he does know what he's doing though & has bred a dozen or more species with good success rates

Thanks again! It seems this is a relatively hard one. I will be more patient on them.

Hi,

I bred them half a year ago.
When there was an low pressure area drawing near I made a big water change with cold water.
This triggered their first spawning, nearly all eggs were unfertile, but the following weeks they spawned several times.

The raise of the fry was nearly without losses, they were from the start big enough to take brine shrimp nauplii.

The temperature in the 450l tank was 25 °C with a pH around 7.5, I had a group of a dozen trilineatus together with other cory species, ancistrus and some tetras. I raised the fry in the first in plastic boxesfloating in the tank changing water completely twice a day and exchanging the box each two days.
After one week I moved them in a small 10l tank, with 2-3cm I moved them in my cory raise tank (100l).

Cheers,

I've had no problems with breeding c. trilineatus.
When it comes to spawning, my group has gone totally nuts lately, spawning almost every day. The reason for this behaviour is that there's an awful lot of current in their tank right now, as I am cycling a new filter along with the old cycled one, which means twice as much current as usual (this is internal filter). So more waterflow can make them spawn easier.

When it comes to raising them, I have found them no more difficult than other cory species. But what is needed to succeed, is cleanliness. I change all water and tank each and every day. I don't have to care about the PH, they do very well in the tap water (which actually is too high for keeping cories). But what is vitally important is that the water you use when you change water is exactly the same temperature as the old water.

This is how I do it: I hatch the eggs in icecream boxes, with an airsupply. When the fry has hatched, I take a clean icecream box and fill with water for the next day's water change. I put this box next to the one with the fry. This way the water will have the same temperature (I don't use a heater in the boxes). When it's time for the water change, I pour out as much water as possible, without pouring out the fry (pour the water into something, as some fry can suddenly come like a torpedo, and you don't want it to end in the sink), and then take the small rest of the water with the fry, and pour it into the new box with clean water. I've found that one day without water changes = dead fry.

This autumn I've had an awful lot of cories spawning, and among the fry I have, the trilineatus has been the most hardy this time (to my big surprise - as I'm used to schultzei fry surviving almost everything. But this time I've had less problems with my trilineatus). Because of heavy rain in the area, the PH in the tap water changed, and that was not good news for the fry. A sudden drop in PH is tough for them to survive. Where I lost fry in every icecream box (and strangely enough the schultzi fry was the ones I lost the most of), I didn't lose any trilineatus fry. That really surprised me! I have 13 perfectly healty little ones right now (I've lost two since they hatched - and one of them was doomed from the second it came out of the egg), so i really has had little problems with them so far. Last time I bred trilineatus, I lost fry only if I skipped the water changes for a day (but I did never not lose fry if I skipped it).

Thanks again! So stronger current is additional key? I will try this!

Well, my trilineatus has a lot of current, and they seem to spawn every day now. Actually I am starting to get a little worried about them. I can't imagine how they can have any eggs left, and they are certainly not as fat as they were. I will have to remove one of the filters as soon as possible, as I don't want them totally exhausted. Most spawnings I've had on my cories this autumn (I've had 7 species spawning ) has been trigged by adding/changing current. What we do when we try to trig cories (and other catfishes) to spawn, is to make them believe it's the rainy season. That means lower temperature, more oxygen in the water, more waterflow, more food (and more interesting food) and lower PH. I've even heard about people using a flash to make the fishes believe it's a thunderstorm. I wouldn't believe that to have any effect though. But I haven't tried it myself. But what I have seen is that some cats are sensitive to what kind of weather we have. It seems like some cats can feel when it's low pressure weather outside (which really isn't so strange when you think of it). I've seen that people all over the country getting spawning cats in periods when it's much rain outside. But that has mostly been suckermouths, and not so much cories, though.

Congrats on your spawns Troender! I have read a lot on how to create rain season effects. But the flash light is a new idea to me. Thank you for sharing that with me. I will add a powerhead in my tank today. I hope this trick will works for me as well. Thanks again!

I'm not so sure about the commercial breeding of C. trilineatus in Europe but they are being bred commercially in some commercial Florida fish farms and these cultured fish follow the general rule that they are easier to breed than their wild imported cousins. It took a long time before these were first bred in captivity but 20 years ago, not nearly as many people were trying. That makes is difficult to compare any real differences that be exist between breeding wild caught and tank raised fish.
I have never gone wrong by supplying a strong current and an air stone in many of my Corydoras breeding projects. Everyone I have raised in numbers seem to appreciate a lot of currents. Even the larvae as long as they have plenty of bottom shelters. I use piles of hollow ceramic biomedia as refuges for the larvae. They can easily stay just out of the main flows and often seem to rely on the currents to bring food to them.
I combine my power head with a sponge filter to get the benefits of both out of one combination.

Well, the joy of spawning seems to spread in the tank, as the trilineatus' tankmates, c. duplicareus, spawned for their first time today too. It's my 8th cory species this autumn. I have no idea what on earth is happening, as I haven't had much success in cory breeding before. I had only bred 2 species before this autumn. But again: it's an awful lot of current in that tank, so I guess that it's just not possible to resist for the cories. If only my super-arcuatuses would listen to sense too. Because that's the species I am trying to make spawn. And I am out of ideas right now. The males are willing, but the females are holding back.
But now I am going a bit off topic here.

I must add that my trilineatuses are not wild caught. They are bred in captivity. But once you get them started, they spawn over and over and over again. Right now each and every day.

Hi,

I also use a strong stream pump in the main tank, this could be beneficial.
I never made a fuss about the temperature of the change water in the main tank and I didn't experience any negative effects. I have several times intentional had temperature drops of around 4-5 °C. Already the first one triggered the spawning, but afterwards they also spawned regularly without any obvious triggers like water changes or low pressure weather condition.

However, with the fry I always tried to change the water very slowly with those thin air tubes to avoid abrupt changes in water parameters.

My C. trilinetus were wild caughts, so I think this is not really a difficult species to breed but also not the most easy one.

Cheers

Thanks people! Great info!