Rheotaxis
From BAWiki
Definition
Rheotaxis is the orientation of an organism in response to a current. The velocity threshold for rheotactic behaviour consequently is the velocity at which fish change direction, not randomly but orienting their long axis in parallel with the direction of flow to swim against the current. According to DWA-M 509, depending on the species and stage of development the velocity threshold for rheotactic behaviour is in the range of 0.1 to 0.3 m/s.
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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); translated from "DWA-M 509: Fischaufstiegsanlagen und fischpassierbare Bauwerke – Gestaltung, Bemessung, Qualitätssicherung (Mai 2014)"