I'm looking into possible population reinforcement of T. cristatus in Scotland as part of a wider conservation programme.
I have observed during my work at Thoiry Zoo is about 35-40 % mortality rates , but obviously it depends on several factors such as the age of the female, the water quality,temperature and food ...
As for my experience it varies, from 5% to 30-40%.
It is depeneds on season, mostly due to food availability. In general I would say in is avarage rate of mortality like in most other salamandrids. I can have only say it is lowest mortality of larvae of hinobiid - they are highly levely.
Both helpful answers, thank you Axel and Mikhail. Compared to natural mortality rates, the boost to productivity for populations on the edge of the species range probably makes headstarting a viable strategy. Local water quality here is good in terms of purity and lack of polution but poor in terms of pH which tends to be lower than optimal. Food availabilty in a captive environment should be good, and based on experience with Lissotriton helveticus, temperature should also be optimised.
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