The River Chongchon in the area of Dohwa-ri, Kaechon City, South Phyongan Province of Korea is the main habitat of Chongchongang sweet fish.
The Chongchongang sweet fish is a freshwater fish belonging to the family of sweet fish. It is 20 to 25 centimetres long.
It likes comparatively cold and clear water and swims up and down the river and the sea. The fry hatched out of the spawns swim down to the sea to spend winter and come up to the river in groups in April and May the next year. At the time, they are 6 to 7 centimetres long.
They lay thousands of spawns, about 1 millimeter across, in the neck of the rapids on gravel, more than 10,000 spawns at maximum.
The fry hatch out of the spawns after 8 to 10 days and they are around 6 millimeters long.
The Chongchongang sweet fish grows very fast.
It was designated as living monument No. 405 and is actively protected and propagated in Korea.