HERI – Research Actions Database

Description

The research project has been addressing a series of open questions regarding the triggering of fish migrations and the orientation of fish in water bodies. As part of the project, four stimuli—acoustics, light, water temperature, and current—are being investigated. Thermal, acoustic, and light stimuli are generated in situ at the entrance of fish passage facilities. Drone-based, high-resolution optical and thermal imaging cameras are being used to measure the flow and temperature conditions. Flow measurements are conducted non-invasively using optical methods such as Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV). Furthermore, existing software tools are being tested, further developed, and optimized to address the research questions. Preliminary results suggest that among the parameters investigated, only temperature plays a role in triggering fish migrations and in the orientation of the fish. No effect of acoustic stimuli, current, or light was observed. These results also challenge the current prevailing paradigm that river fish require a pronounced "attraction flow" to find the entry points of fish passage facilities.

Organisations

• VERBUND Hydro Power GmbH

Funding

Specific Funding Sources:
N/A

Level of Action:

National: AUSTRIA

Applications

Small-hydro, Large-hydro

Keywords

River management

Areas of Research

Last Updated: 18/12/2024 13:04

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