Clinical observations, environmental parameters, and gut microbiota alterations associated with gas bubble disease in the endangered Anji salamander (Hynobius amjiensis) - Haiyan Dong; Minglan Dong; Xiaolu Jin; Zhedong Lang; Xianting Wang; Jiabao Xu; Zixing Hu; Xiang Xu (Frontiers in Veterinary Science, 2026)