Dian Lake
Together with other Yunnan lakes (Fuxian, Qilu, Yangzong, Xingyun, and Yilong), Dian Lake is recognized as an ecoregion. Among three major Yunnan lakes with a high number of endemics, the other two being Fuxian and Erhai, the most drastic loss of biodiversity has been seen in the Dian. Of the 25 native fish species and subspecies in Dian Lake, 10 are endemic to the basin: "Acheilognathus elongatus", "Anabarilius alburnops", "Anabarilius polylepis", "Cyprinus micristius micristius", "Liobagrus kingi", "Pseudobagrus medianalis", "Silurus mento", "Sinocyclocheilus grahami", "Sphaerophysa dianchiensis" and "Xenocypris yunnanensis". Today the only endemic fish known to survive in the lake itself is "Anabarilius alburnops", but it is endangered. The remaining have not been recorded there since the 1990s or earlier, and most of these are likely extinct. Two other species, "Schizothorax grahami" and "Yunnanilus nigromaculatus", are endemic to the general region, but have also disappeared from Dian Lake itself. Among the non-endemic natives, only gold fish and Asian swamp eel still live in Dian Lake. In contrast to the status of the natives, the lake is now home to more than 25 introduced fish species.