Sonar
From BAWiki
Definition
Sonar is a method that uses sound waves and their reflections to distinguish and detect objects under water. Sonar cameras can, for example, be used to observe the behaviour of fish near transverse structures.
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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)