I've emailed a few Asian exporters in the past and all datnoid species have been recently and successfully bred in captivity farms, except for the ST/pulcher. Captive bred datnoids can be readily found in the Asian market. As far as trying to find out how breeding farms do it, that's something breeding farms won't tell you exactly (trade secret, unethical method, who knows). That makes the ST even harder to come by and more puzzling to understand. It could also be that ST are restricted from any commercial breeding as a protected specie.