北海道の魚道データベースの作成について（報告）

抄録

To understand the characteristics and trends of fishways in Hokkaido, data from 2,324 fishways were collected and a database system was created. The most common design was for small fish (more than 50% of fishways), and the second most common design was for both large and small fish (approximate 20% of fishways). Very few fishways were found to have been installed in the 1970s, but this increased gradually in the 1980s and rapidly in the 1990s, before decreasing from 2000. Most of the fishways were pool fishways, such as stepped fishways and ice harbor fishways. These results will be released on the Internet, after the data were processed using a geographic information system.