Abstract
These days, riverbank protection works that are intended to work as pupation place for fireflies, Luciola cruciata, are popular in Yamaguchi prefecture. Although many such works has already been constructed, some of them are successful and others are failed. Follow-up surveys to check the reason of success or failure of the works have not conducted yet. In this study, we conducted field surveys to know how fireflies utilize bank protection works in the Ichinosaka River, a famous river by fireflies. We tracked the climbing larvae from April to May 1999 and checked out the pupation place. Next, we established nets on the revetment and the bed of the river from May to June and counted the number of emergence of fireflies. From those surveys, we found that not only revetment but also major bed was utilized as pupation place byfireflies. Not only the revetment but also lighting condition, current velocity, height of the major bed and the maintenance program for those facilities are found to be important.
