During ethohydraulic investigations in large-scale model flumes the fish behaviour in hydraulic/constructive conditions is observed and analysed. The laboratory set-ups always have to have a situational similarity to existing circumstances in the field. The designated target is, for example, to find the requirements on fish passage entrances to ensure the good findability by fish and therefore the functionality of these buildings. Thus, a consequent consideration of the positive rheotaxis behaviour of fish and the proper connection of branch currents to the mainstream is necessary to provide continuous flow paths, as migrating corridors to fish. Impasses and interfering currents in in the migrating corridors are debilitating and lower the efficiency drastically. All the requirements above are essential, so fish passages are found and accepted by the fish without critical delay.
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