In total, there are 25 native fish species in the lake, including 12 endemics. The situation for many of these is precarious because they have been negatively impacted by introduction of exotic species of fish, habitat degradation, water pollution, and overfishing. The table below lists endemic species, all cyprinids, that have declined strongly and are rated by the IUCN; some of them may already be extinct.
In 2001 it was reported that earthenware and stonework covering an area of approximately 2.4–2.7 square kilometres had been discovered beneath the lake. Carbon dating circa 2007 confirmed an age of 1750 years, or approximately 257AD. It is thought that the remains may represent buildings from the ancient Dian Kingdom that slid in to the lake during an earthquake.
In 2006, CCTV made an additional survey. Carbon dating in 2007 found relics to be roughly 1,750 years-old. In October 2014 additional research was made on the site by a multidisciplinary team. Portions were mapped and 42 handmade stone artifacts were recovered from a depth of seven metres.
^ abSumin, Wang; Hongshen, Dou (1998). Lakes in China. Beijing: Science Press. p. 374. ISBN7-03-006706-1.
^Cui, Y. D.; Liu, X. Q.; Wang, H. Z. (2008). "Macrozoobenthic community of Fuxian Lake, the deepest lake of southwest China". Limnologica - Ecology and Management of Inland Waters38 (2): 116–125. doi:10.1016/j.limno.2007.10.003.
^ abQin, J.; Xu, J.; Xie, P. (2007). "Diet overlap between the endemic fish Anabarilius grahami (Cyprinidae) and the exotic noodlefish Neosalanx taihuensis (Salangidae) in Lake Fuxian, China". Journal of Freshwater Ecology22 (3): 365–370. doi:10.1080/02705060.2007.9664165.
^Yang, J.X. and Y.R. Chen, editors (1995). The biology and resource utilization of the fishes of Fuxian Lake, Yunnan. Yunnan Science and Technology Press, Kunming, China. ISBN 9787541607677