The Brachymystax lenok is a freshwater fish which lives in water less than 20℃.
It has irregular small red spots on a silverish-white ground.
During spwaning time, the whole body becomes red and dorsal and pectoral fins have rainbowlike luster.
It ususally feeds on larvae of insect in water and small fishes.The neighborhood of Jeongamsa Temple was developed for mining industry, which deteriorated the water quality.
As results, there are some places where Brachymystax lenok can't live now.
The number of brachymystax lenok in Jeongamsa Temple has been decreased, so that recently, some of them left in neighboring brooks and valleys were caught and moved to the pond in Jeongamsa Temple.
Since Brachymystax Lenok Breeding Place in Jeongamsa Temple is the southernmost part in the world where this fish can live, and the number of this fish is getting less becasue of environment pollution and overfishing, it is designated and protected as a natural monument.