Sia Meng,
I don't know if it's a good idea to list down the incubation periods of the various killies we have. It can be misleading.
We know that "egg development time" depends on many factors, 2 of which are temperature and the dryness of the peat. I think another factor is the amount of oxygen made available to the eggs during incubation. Now, let's pause a while and think about this. How is it like for the eggs in nature?
I used to believe that Notho eggs won't hatch if they are not put through a dry incubation period. But now I don't think this is necessarily true. Mother Nature is very clever, far more clever than we give her credit for. If the species is to survive and they have survived for millions of years, I'm quite sure many Notho eggs will hatch even before the ponds dry up.
We already know eggs of the same species can have different development rates. And the difference can range from 3 weeks to something like 4 months. I do suspect if we leave the eggs in the breeding bowls and don't collect them, chances are one day someone will report seeing fry in their tanks.
I think Lily has hatched Notho rachovii eggs that were incubated for only 3 weeks whereas Alex has also hatched them after an incubation period of more than 3 months. They both got the fish from me, mind you, so we are talking about the exact same species of killie. So the difference can range from 3 weeks to 3 months. I don't know how information like that can be useful to anyone.
So let's just keep in mind that the best thing to do would be to watch out for "eyed-up" eggs. As you have discovered yourself, most Nothos will hatch after an incubation period of between 6 to 8 weeks.
There's also this thing called the "hatching window". How long will "eyed-up" eggs stay alive if we don't wet them? Here again, I think it depends on various factors too so we can never be sure.
The thing about killies - the more I learn about them, the less I understand.
Loh K L
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