Credit: Kayano Takeuchi, Motoi Takeuchi, Wataru Kakino, Yutaka Uyeno
An example of a preliminary survey site (left, middle) upstream of the Sakasa river in Nagano Prefecture and Margaritifera togakushiensis (right; due to modification of the survey site being prohibited, the length of the mussel bodies was measured and immediately restored with the presence of the manager.