Lessons learned from the reintroduction of the Chinese giant salamander

Summary

The Chinese giant salamander (Andrias davidianus), the world's largest amphibian, has declined roughly 80% since the 1950s from habitat destruction, pollution and overharvesting for its meat, and was listed Critically Endangered in 2004 despite legal protection since 1989. A partnership between the Shaanxi Institute of Zoology, Memphis Zoo and Mississippi State University tested whether captive-reared, farm-sourced salamanders could be reintroduced to the wild, releasing 32 juveniles, surgically implanted with VHF radio transmitters and PIT tags, into the Heihe and Donghe rivers of the Qinling Mountains in March 2013. The younger Heihe group (about three years old) was released six weeks after surgery, while the older Donghe group (about five years old) was released sixteen weeks after surgery to allow fuller recovery; two trained local field assistants monitored both groups daily via radio telemetry until transmitter batteries failed around September 2014. The Donghe group achieved a 0.7 annual survival rate, comparable to reintroduced American hellbenders, while the Heihe group's survival was only 0.4, largely due to suture dehiscence from insufficient recovery time and flood-related losses; surviving, recaptured animals had all gained weight and length and were only 7% lighter than wild conspecifics, with large boulders identified as the key habitat feature for settlement. Both release rivers lay outside protected areas, leaving released salamanders vulnerable to poaching once the study concluded. The project rates itself only partially advanced toward success, noting it demonstrated captive-reared salamanders can survive over a year in the wild but that establishing a genuinely self-sustaining population will require long-term, better-funded reintroduction inside protected habitat.