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Sex ratio in C. cyanurus/chenggongensis

This is a discussion on Sex ratio in C. cyanurus/chenggongensis within the Fire-Belly & Sword-Tail Newts (Cynops & Hypselotriton) forums, part of the Species, Genus & Family Discussions category; I have a group of 6 breeding adults, and have produced large numbers of offspring for several years. The offspring ...

Fire-Belly & Sword-Tail Newts (Cynops & Hypselotriton) Perhaps the most famous and frequently bred newts in captivity, the fire-bellied newts and sword-tail newts are well known throughout the world as being excellent, gregarious captives.

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Old 27th May 2012   #1 (permalink)
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Default Sex ratio in C. cyanurus/chenggongensis
I have a group of 6 breeding adults, and have produced large numbers of offspring for several years. The offspring have a skewed sex ratio - mostly females.

My breeders came from two different sources. There is no locality information for either group, so it's possible they are different races/localities/subspecies. Is it possible that this could cause some kind of genetic problem that would favor female offspring?

Has anyone bred enough numbers of C. cyanurus/chenggongensis to have any information on the sex ratio of the offspring? I really wonder what is going on.
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Old 27th May 2012   #2 (permalink)
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Default Re: Sex ratio in C. cyanurus/chenggongensis
I have no personal data to contribute, but these kinds of sex ratio inequalities are very interesting. There are a number of mechanisms that could give raise to the skewed ratio but there´s no telling which one is responsible....
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Old 20th August 2012   #3 (permalink)
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Default Re: Sex ratio in C. cyanurus/chenggongensis
well, for what it's worth; the 4 youngsters I got from Jen turned into 3 preggers females and 1 horny male :) They are having an ongoing fertility festival and egg-laying bonanza.

I have some chenggongensis youngsters, but too early to tell sexes.

Who knows, maybe there's a temperature or environmental control as with crocodiles?
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