I heard that R.ciliatus can be temperature sexed...can anyone confirm this? I see more and more males availible and no females and it that makes sense if you are a dealer and want to raise the prices of females which are apparently rare...What do you out there think about it? It will be good if someone can post any info regarding that from own experience.
Temperature sexed or not?
- Thread starter kimo
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satanic maiden
New member
I agree with Debbie, it has not been proven that they are TSD. We have been breeding a good few years, all you can say is you may get more females at lower temps but not 100%
I've been breeding cresties and gargoyles for 10 years, and I vote TDSD/TSD - temperature dependent sex determination.
The Rhac book by Repashy/Fast/Vosjoli also mentions it, and devotes a section to it.
" With the exception R. chahoua, Rhacodactylus appear to have TSD, although this would have to be confirmed with the New Caledonian live-bearing gecko, R. trachyrhynchus. Although studies have identified with some precision the temperature thresholds for TSD trends in leopard geckos (see Viets 1998 ), no methodical research has been done to date with Rhacodactylus. What we do know is that temperature thresholds for TSD appear to be generally lower for several Rhacodactylus, in part because they have a lower incubation temperature tolerance. "
TSD is trickier in Rhacodactylus because there are so many species involved. (If they re-do the Rhac family tree, it just might help explain the TSD differences?). The Rhac book goes on to explain in more detail if you've got access to it. In general, the cut-off temperature for one gender to the other is different for each species. Cresties have a lower cut-off, while gargoyles have a higher one. Leaving both eggs at typical room temperature results in more male cresties and female gargoyles - which is pretty much what we're seeing in the hobby. Same with leachies - more females than males at the same temperatures.
The Rhac book by Repashy/Fast/Vosjoli also mentions it, and devotes a section to it.
" With the exception R. chahoua, Rhacodactylus appear to have TSD, although this would have to be confirmed with the New Caledonian live-bearing gecko, R. trachyrhynchus. Although studies have identified with some precision the temperature thresholds for TSD trends in leopard geckos (see Viets 1998 ), no methodical research has been done to date with Rhacodactylus. What we do know is that temperature thresholds for TSD appear to be generally lower for several Rhacodactylus, in part because they have a lower incubation temperature tolerance. "
TSD is trickier in Rhacodactylus because there are so many species involved. (If they re-do the Rhac family tree, it just might help explain the TSD differences?). The Rhac book goes on to explain in more detail if you've got access to it. In general, the cut-off temperature for one gender to the other is different for each species. Cresties have a lower cut-off, while gargoyles have a higher one. Leaving both eggs at typical room temperature results in more male cresties and female gargoyles - which is pretty much what we're seeing in the hobby. Same with leachies - more females than males at the same temperatures.
Debbie
New member
We only have experience with cresties, but no matter what we do. we most of the time end up 50-50 (one clutch usually 1 male 1 female).
We incubated eggs in an incubator at 26 degrees, the eggs just took 60 days to hatch and still the same male/female ratio. Now we are doing it as we alwasy did. jJust incybate at fluctuating room temps ( 20-23 degrees) and still the eggs are hatching after 60 days and we have the same ratio.....
So in our opinion they are not TDS..... Or at east not that we noticed
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Auric and chahoua are TDS, but we start breeding them next year....
We incubated eggs in an incubator at 26 degrees, the eggs just took 60 days to hatch and still the same male/female ratio. Now we are doing it as we alwasy did. jJust incybate at fluctuating room temps ( 20-23 degrees) and still the eggs are hatching after 60 days and we have the same ratio.....
So in our opinion they are not TDS..... Or at east not that we noticed
.Auric and chahoua are TDS, but we start breeding them next year....
According to what was stated in their book, Repashy/Fast/Vosjoli say that chahoua are not TDSD. Chances are they have enough breeding experience to come to that conclusion.
Debbie
New member
Then i understoot that wrong, i was not trying to be a smart ass or something.....
I just thought they were.....
So hey, i'm sorry i have informed someone wrong...
Can you please explain to what extent are they TSD and what temps are thought to give more female hatchlings?
Lunar Gecko
New member
Ingo...I missed that article is there a link so that I could read it?
Lunar Gecko
New member
The numbers seem off to me because I get males and females at 77-79f.