Freshwater fish, in a mountain lake about 2400 m above sea level.
Thanks to Acid John (UK) for ID.
The Cypriniformes are an order of ray-finned fish, including the carps, minnows, loaches and relatives. This order contains five to six families, over 320 genera, and more than 3,250 species, with new species being described every few months or so, and new genera being recognized frequently. They are most diverse in southeastern Asia, but are entirely absent from Australia and South America.