There are captive issues, wild issues and importation issues. My main issue as of now is that Calumma parsonii ssp. when imported are often imported as adults. In the wild Calumma parsonii species may take 4-5 years to become adults. Meaning when you collect them it takes a minimum of 4-5 years to relpace them as breeders in the wild population. That means collecting breeding adults is extreely harmful to wild populations. I think only young Calumma parsonii spp. that are either collected, ranched or farmed should be exported. That are one to two years of age and easily replaced by next or the year after next years hatchlings. The downside means there is no or not much captive hatched Calumma parsonii ssp. breeding. However you have got stable and sustainable imports with a healthy breeding non threatened adult wild population of Calumma parsonii parsonii in Madagascar. I was posting issues such as these. I have posted here as well, if you look here at my posts about Calumma parsonii ssp. I have posted (plus articles and video's). This concept is an agricultural term called an animals fecundity. Some wild Calumma parsonii parsonii are estimated to be over 20 years of age. I happen to think those Calumma parsonii parsonii have lived long enough in the wild that they should stay there.
Best Regards
Jeremy A. Rich