Upstream fishway
From BAWiki
Definition
The term upstream fishway is used [...] to refer to a structure which is mainly designed to assist the upstream passage of the relevant migratory fish but which at the same time should be designed in a way which enables ground-based organisms and macrobenthos to pass upstream as well.
Synonyms
fish steps; fish ladder; fish migration facility
Abbreviations
Source
Guideline Upstream Fishways on German Federal Waterways (AH FAA), Bundesanstalt für Wasserbau (BAW) und Bundesanstalt für Gewässerkunde (BfG), Version 2.0, 26/06/2015 (retrieved 10.05.2017)