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Unfortunately, I am unable to tell you why this happens. All we know about the sticking if eggs at the ceiling of the cave amounts to waht Walter Foersch had found out more than 35 years ago. That it is a matter of a too high mineral content, especially calcium in the water.
It would help if we knew about other species in your water. Have you made the same observations with the eggs of them or not? Personally, I do not think it to be matter of the age of the male, since we had older males (of other species) with normally sticking eggs. But it maybe an individual problem of that male, of course.
The other thing is that I had some success with reducing the pH below 4.0, even to 3.5 in some cases. This may help, but it’s not sure, of course.
Anyway, you should try to raise at least a part of the clutch artificially. I think of the fact that the main breeder of phoenicurus during the first years, Martin Fischer, had strange difficulties himself with the last clutches. The only thing I can say is that we must try not to loose the species altogether. So, it would be good news that the development of the larvae is going on.
No, this is related to the water hardness (Calcium) and Ph value. The air bubbles and the eggs are, the higher the water hardness is greater so I do not stick mehr.Weiß from personal experience, the phenomenon I had at times as I have grown splendens Betta yet, it was exactly the same. If I have used soft water remained the eggs in the nest.
But that happened to me today, when I remember it. A Wasserwechel and he collects the eggs and stick them back into the nest.Hallo Bernd,I got my first Paros in 1973 from Dr. Foersch and since that time I know the problem about Calcium. My water has less than one KH ! and 5 pH. I mixed rainwater + Osmose. On this way I have breeded Paros a lot of times and the eggs stick always.
Best regards HansOk, since 1973, which is long, because I can not keep up.
I have my Paros on rainwater 8-15 micro sims, but even then that happens sometimes, water parameters are always in motion and I do once a week water change after a water change is usually fixed.
When harvey I have already had, 1 male and 2 females, which were subsequently sold two clutches in a tube, so 60 to 70 eggs are then available. Of the male has dropped more than half on the floor and left to themselves.Today eggs lay at the floor of the cave again. Now I will change the water and riduce the pH.
Out of the last spawn some larvas are o.k. !Dear Schellfisch, I remember that Foersch had such problems with some pairs too, but most of these eggs developed properly nevertheless (if the water was OK). This may – hopefully! – be the same in your case. I am sure, you will try to raise young even from eggs that lie on the bottom of the cave. Those eggs should be fertilized and may develop although they are not as eagerly cared for by the male. But often they are: most males try to fix them again and again, without success but probably by cleaning them nevertheless from adhering bacteria or fughus.
I changed 30% of the water and found two little fries – perhaps two weeks old in the old water. I hope in the tank exist some more.
Glad to hear that Hans 🙂 May be the male moved some of the eggs somewhere else in the tank. I was able to observe one spawn where it seemed like the eggs would not stick to the surface of the cave and they were all laying on the ground, but the male moved them to a cave that was formed out of leaves from the leaf litter in the tank, raised them there and after couple days he moved the larvae back to the pottery cave. But I think this particular male does this on regular basis becouse I was never able to observe him guyrding eggs in the cave but I was isolating larvae from this cave before.
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