Hokkaido, Bekanbeushi River St.2

St. 2 is the mid-stream of the Bekanbeushi River located 5.5 from the river mouth.

Breeding site number two from the below publication.

• Journal of Evolutionary Biology 2010

  Ecological divergence and habitat isolation between two migratory forms of Japanese threespine stickleback (Gasterosteus aculeatus)