*Umatani, Yoshiyuki and Okuda, Atsushi "Changes in the fish fauna associated with the slit of the erosion control dam in Kotohira River, a tributary of Teshio River", in Technical report for boreal forest conservation of the Hokkaido University Forests, no. 34, 2017, Japanese language. (http://hdl.handle.net/2115/72989 )