This impact has greatly contributed to the decline of fish migratory species, such the European eel or the Atlantic salmon, being both important in fisheries resources. In the particular case of the eel, worldwide threatened, the cumulative mortality of adult downstream migrating in large rivers towards the sea can exceed 90% due to the succession of industrial water intakes.
This important ecological problem has been legally take into account trough the European Water Framework Directive and the recent European Commission for eel protection, underlining the need to reduce this kind of mortality. Various behavioural barriers have been tested to deflect fish away from a water intake by the use of stimuli like light, sounds, electric fields, bubble curtains, with a relative efficiency.
Today, ProFish Technology, a spin-off of the University of Liège (Belgium) proposes a new concept of fish behavioural barriers based on the emission of infrasounds. This technology has been developed by the University of Oslo, Norway (Prof. O. Sand), and was successfully tested by the University of Liège on a nuclear cooling water intake in Belgium. Based on these encouraging results, Dr. Damien Sonny, fish biologist of the University of Liège and now Director of ProFish Technology, has acquired an exclusive licence from the team of Prof. O. Sand in order to propose infrasounds as an efficient behavioural barrier to industries and rivers managers.
Infrasound are acoustic signals characterised by frequencies below 20 Hz. Infrasounds are natural alarm signals for fish, and the intensity used by the infrasound fish fence of Profish Technology create literally shake the fish, creating an uncomfortable area that they always avoid, with no habituation. Consequently, this system has revealed in the scientific literature the best efficiency results on the largest number of fish species, as observed during the test on the cooling water intake in Belgium where a reduction of 85% of the fish entrained was observed. An adequate location of the infrasound units will thus induce avoidance trajectories of fish. It is possible to adapt the operation of the system to migration periods of target species, in autumn for the downstream run of the eels, or in spring for the migration of the young salmons.
The nuclear power plant of Tihange (Electrabel) in Belgium, that collaborated actively with the University of Liège during the basic research, has shown its interest to the infrasound technology, and by this autumn, several infrasound units will be placed at the mouth of the water intake to keep fish downstream migrating in the main channel of the River Meuse. Electrabel Tihange will be pioneer in the use of infrasound on industrial water intake.
Beside the repulsion technology, ProFish Technology proposes the design and the conception of fish passes, for upstream and downstream migration, addressing solutions to all kind of fish migration problems, with the possibility to use infrasound as a guidance towards fish passes.
By its technology and services, ProFish technology reconciles industrial activities with environment. Several companies have already showed their interest, and some contacts have been taken with Hydroquébec (Québec-Canada), New York Power Authorities (USA), EDF (France) and Shell (Australia).
Didier Moreau | alfa
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
Magnetic resonance imaging, or MRI, is a widely used medical tool for taking pictures of the insides of our body. One way to make MRI scans easier to read is...
At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.
Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
26.04.2018 | Medical Engineering
26.04.2018 | Power and Electrical Engineering
26.04.2018 | Information Technology