The interaction between industrial systems and our natural environment is rich with problems thrown up by the 'Law of Unintended Consequences'. As the environmental movement gathers momentum, one area has consistently failed to galvanise public imagination. They're not cute like baby seals, lack dolphins' charisma and haven't mobilised the masses like the anti-whaling lobby. Yes, we're talking about fish. Industry's use of water resources is largely out of sight and out of mind. Each year thousands of fish find themselves diced by turbine blades, trapped and suffocated against intake filters and boiled amidst scalding waste water plumes. Now the dudes at ProFish Technology (a spin-off from the Uni of Liege) have come up with a behavioural barrier to deflect fish around water intakes using infrasound. Infrasound literally shakes the fish in mid-water - a fairly unpleasant sensation that encourages the fish to move right along. Good news for the European Commission for eel protection which has steadily worked it way through solutions featuring light, loud sounds, electric fields and bubble curtains in its bold quest to reduce the 90% mortality suffered by migrating eels each year. Infrasound may prove to be a winner - lets hope the fish appreciate the sentiment! http://www.ulg.ac.be/foreign/ Image: Infrasonic fish repulsion unit, ProFish Technology, University of Liege



