Here are the results of study on the fish fauna accomplished in the middle stream of Imjingang (River), Namdaecheon (Stream) in Cheolwon-gun from June, 2004, and June, 2005 as shown below. The fish species were totally 9 families and 32 species. Among there, the species belonging to the endemic species of Korea were 13 species. and The species belonging to the wild animals and plants facing extinction crisis were recorded as 3 species. In addition, it was identified at first in this study that Rhynchocypris kumgangensis lived also in the Imjingang (River) water system.