I breed this species regularly with carp pituitary (I don't waste my time with problematic Corydoras anymore - it's not worthy of the frustration). But hatching the eggs seems to be quite difficult. I cannot hit the right chemistry. It was not so surprising that I raised only 7 pieces out of c. 250 ...

Some importer in Austria offers them for 600 EUR/piece. I thanked him and said "bye bye".

The incessant water changes are annoying, though. I had to move the oldest batch of fry (10 days old) to a bigger tank because of the lack of space, and two days later, the usual uncontrollable dying started. I had 32 pieces in 45 liters, and I had to change 75-80% water every 36 hours to keep them ...

Some people even say that the cause of death is the bacteria layer on the bottom. Anyway, changing water and removing the layer helps a lot, and it can guarantee virtually 0% losses.

I don't know what you mean under the term "treatment station". In any case, since I raised the temperature, they have been spawning without problems.

I don't think that it is genetic. If you don't change water, all fry die. My experiment with acriflavine was not successful, by the way. It does not work at all. And I will probably remove sand as well because the fry cannot find food on it. Maybe, some drugs such as ESHA 2000 could be effective bec...

Maybe a banal question, but even after 20+ years of breeding Corydoras, I haven't found a satisfactory answer. We all know that Corydoras fry are very sensitive to water quality during the first few weeks of life, but what actually causes the mass dying? Apparently, it is not ammonia, nitrities, or ...

I cannot be 100% sure about the cause-and-effect but I kept the temperature warmer (23-24 C) and the last two spawnings had about 70% fertility rate. Really a huge difference! The fry hatched very well, even in tap water with 9 dGH and alkalic pH close to 8.0. Again, a big difference when compared w...

I wonder if anybody visits this forum at all? My YouTube video with the spawning of green lasers has 6 views so it is clear that nobody even bothers to read what I wrote.

The second spawning of my laser group (on Wednesday) produced 77 eggs but again, 0% are fertile.

Hello, has anybody of you experienced problems with the fertility of eggs in the "laser" Corydoras? I bred Corydoras green laser briefly, about 10 years ago, and I remember that the results were dismal, with barely 50% fertile eggs. On Wednesday, I set up a new 210 liter tank exclusively f...

During the years 2009-2011, I spawned these fish regularly with carp hypophyse. But they always spawned only 3-times in one-month intervals. Then they needed a long pause for at least 3/4 year. The maximum count of eggs that I got out of 4 pairs was 309. The eggs were laid on the glass, usually in p...

I have just found these corys at my LFS, they were in the same tank as some C.Sterba and the manager said that they came in with the last batch of corys, he also said that they could be a cross bred fish??? :-\ I was a bit put off by that statment but decided to get three of them anyway and am hopi...

Hello, I would like to add more females to my breeding group of Barbatus (3 males : 6 females), but I am not sure if the males are able to keep up with the females' sex appetite. I have read that some people have only 1 male in a group of many females - and it works well. What's your experience? In ...

The death of young fry isn't caused by bacteria, but by parasitic protozoa (Tetrahymena etc.). I use Chloramine, 2 g/100 liters of water before every water change for 30-60 minutes. It doesn't kill these protozoa, but it kills bacteria on which these protozoa thrive. The method with fine sand always...

I must share my today's shocking experience with you. My four females of Corydoras robineae were virtually loaded with eggs, so I injected them and I expected a nice result - something like 90 eggs (that I got last time, but they were subsequently destroyed by fungus). But I have collected roughly 2...

I really don't know, what happened, but my Robineae again started to fill with eggs. And I didn't use any special food. Only beef heart and cyclops, sometimes tubifex and earthworms. When I observed that males trained the T-position in the front of females, it seemed that it was the right time to in...

So this is my first post, but i read the whole thread on the robinae corys.....you two guys really got upset. I know my opinion doesnt count since im a newb, but come on. I have a degree in fisheries biology, i have injected plenty of fishes, mostly with antibiotics, but inducing spawns does have a...

It's difficult to say, because the reasons can be many. Eggs from the first spawnings are usually infertile, because they are overriped. If the fish continue in spawnings and eggs are still infertile, then the fish are very probably defective. I had to get rid of two breeding groups of sterbai and t...

If the Corydoras robinae are not showing signs of ripening ova then consider the possibility that they may take longer than you expected for them to reach sexual maturity and the possibility that they may be seasonal breeders. I would suggest that you continue to work with them for five years and m...

If it were the last specimens know to exist on the planet then I may relent, but the fish you are very successfully killing by this method is not so far as I know endangered. Ian During the last two years I have made several hundreds of hormonal applications and I have lost only one male of Corydor...

For you to have fishes that do not produce eggs at all I would put down to lack of basic aquarium skills, my group of 6 C. robiniae are as close as it gets to breeding as they can be without actually spawning, with both females in the group definitely full of eggs. As yet I have made not attempt to...

Eric Bodrock also had "patience", but he has never spawned his Robineae again and later got rid of them. And if I didn't use hormones and I followed your advice, I would unsuccessfully try to spawn them perhaps until my retirement age, not knowing, where the real problem lies. And by the w...

Successful breeding is not a success? I could save two last robineae, who survived the first wave of dying, and send you a photo. But I really didn't want to bother with two pieces of this fish, because I had hoped that I would have another ones from future spawnings. Which I don't have. And I don't...

Although I know that some visitors of this web site don't like hormonal breeding of fish, I would like to share my experience with the hormonal breeding of Corydoras robineae - because in the end, it brought the same problems I mentioned previously in other "problematic" species. I have tr...

Cartouche, I am not able to respond a soon as I would normally do because of other time consuming work and by now your eggs should have hatched and fry free swimming. Not wishing to offend your integrity but did you think to read the sticky that I have written, detailing my recommended methods for ...

Fortunately, the eggs hatched perfectly in my tap water (8 dGH) - with a bit of HCl that I add to reduce my high pH 7,5-8 to 6,5. So the info on the German page must have been a pure mythology! In the softer water (4 dGH), hatching was obviously worse, but still, I have 40 pieces of fry out of 59 eg...

Several months ago I referred about my unsuccessful attempts to breed Corydoras loxozonus. Today they started to breed on their own and I would like to know, what to do with the eggs, because it may be a rare event. I have read in the internet that raising the fry is not just easy http://www.aquaris...

If you want to stimulate Sodalis anyhow, I can give you some advice: Combine large water changes with drops of temperature and very strong filtration. After cca 2 weeks of such a practice, the fish were apparently stimulated and males chased each other in the tank. However, since females had no eggs...

I know more breeders than Ian Fuller, who spawned difficult Cories like Sodalis. But what's the most important thing, they succeeded only once. And if you can't repeat it, it's worthless from the practical point of view. Maybe you can become a member of some prestigious club of "Master Breeders...

I don't doubt breeding these species. I only state that I can't breed them, because they produce no eggs. I don't know, how these people do it (or, better say, how their fish can do it). I think that I regularly guarantee a high-quality food to all my Corydoras. Still, they can't be spawned by any m...