The Turtle Conservation Coalition recently published a report to call attention for the world's most endagered tortoises and freshwater turtles. According to Turtles in Trouble: The World’s 25+ Most Endangered Tortoises and Freshwater Turtles – 2018, more than half of the currently recognized 356 species of turtles and tortoises are threatened with extinction! Next to conservation projects for restoring and protecting natural hibatat and protecting the species itself, conservation through captive breeding is one of the methods for assuring viable populations. One good example of that is the ESF studbook for Testudo kleinmanni, mentioned in the report. The report can be downloaded here.
The Turtle Conservation Coalition is an informal coalition of leading turtle conservation organizations, including Turtle Conservancy, IUCN Tortoise and Freshwater Turtle Specialist Group, Turtle Survival Alliance, Global Wildlife Conservation, Wildlife Conservation Society, Chelonian Research Foundation, Turtle Conservation Fund, and Conservation International. Please visit http://www.turtleconservationfund.org/ for ore information.