fish passage
structure that allows fish and other organisms to pass artificial or natural barriers at watercourses
en-US/ˈfɪʃ ˈpæsɪd͡ʒ/
en-GB/ˈfɪʃ ˈpæsɪd͡ʒ/
structure that allows fish and other organisms to pass artificial or natural barriers at watercourses