View Full Version : Strophurus sex ratio

06-15-2005, 05:25 PM
Hi all,
I was just wondering if you Strophurus breeders could tell me if you have noticed an even or uneven sex ratio within the genus?

Thanks for any help,

Jerry Peebles
06-22-2005, 12:55 PM

That's a good question, so I took a look back at the past five years of my notes on Strophurus. Out of approximately 300 hatchlings (from six species) that I produced and was able to eventually know the sex on, I ended up with just about exactly and even ratio of males to females on most species. Spinigerus were a bit female heavy and c. ciliaris a bit male heavy certain years. Most of these were incubated at about 82 F (28 C). There is some evidence that Strophurus are TSD (Temp. sexed determined), and I've played around with this a bit, however, it will take some time to learn more. For now, 82 F seems to work so well for most species that there is not much point in changing.

Hope this helps,


06-23-2005, 08:50 AM
Thanks Jerry. Much appreciated. Have you managed to level out the ciliaris and spinigerus ratio now?

Jerry Peebles
06-24-2005, 09:57 PM
Hi Justin-

I have not bred spinigerus long enough to have had the chance to do any experimenting yet. Plus, I'm not too disappointed with the sex ratio so far. As for ciliairis, I have played around changing the incubating temps a bit and honestly have not noticed much difference. Perhaps a more radical change is needed to make a difference. At any rate, nothing I'm doing is what I would call scientific, yet I would like to eventually figure out to what extent certain species are (or aren't) TSD.



Nathan Hall
06-28-2005, 02:34 PM
Perhaps a more radical change is needed to make a difference

I think that is probably correct. There just aren't enough folks out there who are willing to do this. I'm afraid that the data keepers are the minority. I do my best to keep records of this kind of information.